Merge "Convert junit4 to junit5 - services module"

58 files changed, 1193 insertions, 1335 deletions

diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexMain.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexMain.java
index 7b14dc627..721960779 100644
--- a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexMain.java
+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/main/ApexMain.java
@@ -59,7 +59,7 @@ public class ApexMain {
     @Getter
     private ApexParameters apexParameters;
 
-    private ApexParameterHandler apexParameterHandler = new ApexParameterHandler();
+    private final ApexParameterHandler apexParameterHandler = new ApexParameterHandler();
 
     @Getter
     @Setter(lombok.AccessLevel.PRIVATE)
diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImpl.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImpl.java
index dcae42f2f..c0b752fb1 100644
--- a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImpl.java
+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImpl.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019-2021 Nordix Foundation.
+ *  Modifications Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -82,7 +82,7 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
 
     // The Apex engine workers this engine service is handling
     private final Map<AxArtifactKey, EngineWorker> engineWorkerMap = Collections
-                    .synchronizedMap(new LinkedHashMap<AxArtifactKey, EngineWorker>());
+        .synchronizedMap(new LinkedHashMap<>());
 
     // Event queue for events being sent into the Apex engines, it used by all engines within a
     // group.
@@ -99,13 +99,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      * This constructor instantiates engine workers and adds them to the set of engine workers to be managed. The
      * constructor is private to prevent subclassing.
      *
-     * @param engineServiceKey the engine service key
-     * @param threadCount the thread count, the number of engine workers to start
+     * @param engineServiceKey    the engine service key
+     * @param threadCount         the thread count, the number of engine workers to start
      * @param periodicEventPeriod the period in milliseconds at which periodic events are generated
-     * @throws ApexException on worker instantiation errors
      */
     private EngineServiceImpl(final AxArtifactKey engineServiceKey, final int threadCount,
-                    final long periodicEventPeriod) {
+                              final long periodicEventPeriod) {
         LOGGER.entry(engineServiceKey, threadCount);
 
         this.engineServiceKey = engineServiceKey;
@@ -114,7 +113,7 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         // Start engine workers
         for (var engineCounter = 0; engineCounter < threadCount; engineCounter++) {
             final var engineWorkerKey = new AxArtifactKey(engineServiceKey.getName() + '-' + engineCounter,
-                            engineServiceKey.getVersion());
+                engineServiceKey.getVersion());
             engineWorkerMap.put(engineWorkerKey, new EngineWorker(engineWorkerKey, queue, atFactory));
             LOGGER.info("Created apex engine {} .", engineWorkerKey.getId());
         }
@@ -135,14 +134,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      */
     public static EngineServiceImpl create(final EngineServiceParameters config) throws ApexException {
         if (config == null) {
-            LOGGER.warn("Engine service configuration parameters is null");
-            throw new ApexException("engine service configuration parameters are null");
+            logWarnAndThrowException("Engine service configuration parameters are null");
         }
 
         final ValidationResult validation = config.validate();
         if (!validation.isValid()) {
-            LOGGER.warn("Invalid engine service configuration parameters: {}" + validation.getResult());
-            throw new ApexException("Invalid engine service configuration parameters: " + validation);
+            logWarnAndThrowException("Invalid engine service configuration parameters: " + validation);
         }
 
         final AxArtifactKey engineServiceKey = config.getEngineKey();
@@ -226,7 +223,7 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      */
     @Override
     public AxArtifactKey getApexModelKey() {
-        if (engineWorkerMap.size() == 0) {
+        if (engineWorkerMap.isEmpty()) {
             return null;
         }
 
@@ -234,32 +231,29 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     }
 
     /**
-    * Method to create model.
-    *
-    * @param incomingEngineServiceKey incoming engine service key
-    * @param apexModelString apex model string
-    * @return apexPolicyModel the policy model
-    * @throws ApexException apex exception
-    */
+     * Method to create model.
+     *
+     * @param incomingEngineServiceKey incoming engine service key
+     * @param apexModelString          apex model string
+     * @return apexPolicyModel the policy model
+     * @throws ApexException apex exception
+     */
     public static AxPolicyModel createModel(final AxArtifactKey incomingEngineServiceKey, final String apexModelString)
         throws ApexException {
         // Check if the engine service key specified is sane
         if (incomingEngineServiceKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if the Apex model specified is sane
-        if (apexModelString == null || apexModelString.trim().length() == 0) {
+        if (apexModelString == null || apexModelString.trim().isEmpty()) {
             String emptyModelMessage = "model for updating engine service with key "
-                            + incomingEngineServiceKey.getId() + " is empty";
-            LOGGER.warn(emptyModelMessage);
-            throw new ApexException(emptyModelMessage);
+                + incomingEngineServiceKey.getId() + " is empty";
+            logWarnAndThrowException(emptyModelMessage);
         }
 
         // Read the Apex model into memory using the Apex Model Reader
-        AxPolicyModel apexPolicyModel = null;
+        AxPolicyModel apexPolicyModel;
         try {
             final ApexModelReader<AxPolicyModel> modelReader = new ApexModelReader<>(AxPolicyModel.class);
             apexPolicyModel = modelReader.read(new ByteArrayInputStream(apexModelString.getBytes()));
@@ -276,7 +270,7 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      */
     @Override
     public void updateModel(final AxArtifactKey incomingEngineServiceKey, final String apexModelString,
-                    final boolean forceFlag) throws ApexException {
+                            final boolean forceFlag) throws ApexException {
         AxPolicyModel apexPolicyModel = createModel(incomingEngineServiceKey, apexModelString);
 
         // Update the model
@@ -290,30 +284,26 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      */
     @Override
     public void updateModel(final AxArtifactKey incomingEngineServiceKey, final AxPolicyModel apexModel,
-                    final boolean forceFlag) throws ApexException {
+                            final boolean forceFlag) throws ApexException {
         LOGGER.entry(incomingEngineServiceKey);
 
         // Check if the engine service key specified is sane
         if (incomingEngineServiceKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if the Apex model specified is sane
         if (apexModel == null) {
-            LOGGER.warn("model for updating on engine service with key " + incomingEngineServiceKey.getId()
-                            + " is null");
-            throw new ApexException("model for updating on engine service with key " + incomingEngineServiceKey.getId()
-                            + " is null");
+            String message = "model for updating on engine service with key " + incomingEngineServiceKey.getId()
+                            + " is null";
+            logWarnAndThrowException(message);
         }
 
         // Check if the key on the update request is correct
         if (!this.engineServiceKey.equals(incomingEngineServiceKey)) {
-            LOGGER.warn("engine service key " + incomingEngineServiceKey.getId() + " does not match the key"
-                            + engineServiceKey.getId() + " of this engine service");
-            throw new ApexException("engine service key " + incomingEngineServiceKey.getId() + " does not match the key"
-                            + engineServiceKey.getId() + " of this engine service");
+            String message = "engine service key " + incomingEngineServiceKey.getId() + " does not match the key"
+                            + engineServiceKey.getId() + " of this engine service";
+            logWarnAndThrowException(message);
         }
 
         // Check model compatibility
@@ -334,12 +324,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
      * Execute the model update on the engine instances.
      *
      * @param incomingEngineServiceKey the engine service key to update
-     * @param apexModel the model to update the engines with
-     * @param forceFlag if true, ignore compatibility problems
+     * @param apexModel                the model to update the engines with
+     * @param forceFlag                if true, ignore compatibility problems
      * @throws ApexException on model update errors
      */
     private void executeModelUpdate(final AxArtifactKey incomingEngineServiceKey, final AxPolicyModel apexModel,
-                    final boolean forceFlag) throws ApexException {
+                                    final boolean forceFlag) throws ApexException {
 
         if (!isStopped()) {
             stopEngines(incomingEngineServiceKey);
@@ -369,32 +359,32 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         final var notRunningEngineIdBuilder = new StringBuilder();
         for (final Entry<AxArtifactKey, EngineWorker> engineWorkerEntry : engineWorkerMap.entrySet()) {
             if (engineWorkerEntry.getValue().getState() != AxEngineState.READY
-                            && engineWorkerEntry.getValue().getState() != AxEngineState.EXECUTING) {
+                && engineWorkerEntry.getValue().getState() != AxEngineState.EXECUTING) {
                 notRunningEngineIdBuilder.append(engineWorkerEntry.getKey().getId());
                 notRunningEngineIdBuilder.append('(');
                 notRunningEngineIdBuilder.append(engineWorkerEntry.getValue().getState());
                 notRunningEngineIdBuilder.append(") ");
             }
         }
-        if (notRunningEngineIdBuilder.length() > 0) {
+        if (!notRunningEngineIdBuilder.isEmpty()) {
             final var errorString = "engine start error on model update on engine service with key "
-                            + incomingEngineServiceKey.getId() + ", engines not running are: "
-                            + notRunningEngineIdBuilder.toString().trim();
-            LOGGER.warn(errorString);
-            throw new ApexException(errorString);
+                + incomingEngineServiceKey.getId() + ", engines not running are: "
+                + notRunningEngineIdBuilder.toString().trim();
+            logWarnAndThrowException(errorString);
         }
     }
 
     /**
      * Stop engines for a model update.
+     *
      * @param incomingEngineServiceKey the engine service key for the engines that are to be stopped
      * @throws ApexException on errors stopping engines
      */
     private void stopEngines(final AxArtifactKey incomingEngineServiceKey) throws ApexException {
         // Stop all engines on this engine service
         stop();
-        final long stoptime = System.currentTimeMillis();
-        while (!isStopped() && System.currentTimeMillis() - stoptime < MAX_STOP_WAIT_TIME) {
+        final long stopTime = System.currentTimeMillis();
+        while (!isStopped() && System.currentTimeMillis() - stopTime < MAX_STOP_WAIT_TIME) {
             ThreadUtilities.sleep(ENGINE_SERVICE_STOP_START_WAIT_INTERVAL);
         }
         // Check if all engines are stopped
@@ -407,33 +397,33 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
                 notStoppedEngineIdBuilder.append(") ");
             }
         }
-        if (notStoppedEngineIdBuilder.length() > 0) {
+        if (!notStoppedEngineIdBuilder.isEmpty()) {
             final var errorString = "cannot update model on engine service with key "
-                            + incomingEngineServiceKey.getId() + ", engines not stopped after " + MAX_STOP_WAIT_TIME
-                            + "ms are: " + notStoppedEngineIdBuilder.toString().trim();
-            LOGGER.warn(errorString);
-            throw new ApexException(errorString);
+                + incomingEngineServiceKey.getId() + ", engines not stopped after " + MAX_STOP_WAIT_TIME
+                + "ms are: " + notStoppedEngineIdBuilder.toString().trim();
+            logWarnAndThrowException(errorString);
         }
     }
 
     /**
      * Issue compatibility warning or error message.
-     * @param apexModel The model name
-     * @param forceFlag true if we are forcing the update
+     *
+     * @param apexModel    The model name
+     * @param forceFlag    true if we are forcing the update
      * @param currentModel the existing model that is loaded
      * @throws ContextException on compatibility errors
      */
     private void handleIncompatibility(final AxPolicyModel apexModel, final boolean forceFlag,
-                    final AxPolicyModel currentModel) throws ContextException {
+                                       final AxPolicyModel currentModel) throws ContextException {
         if (forceFlag) {
-            LOGGER.warn("apex model update forced, supplied model with key \"" + apexModel.getKey().getId()
-                            + "\" is not a compatible model update from the existing engine model with key \""
-                            + currentModel.getKey().getId() + "\"");
+            LOGGER.warn("apex model update forced, supplied model with key \"{}\" "
+                    + "is not a compatible model update from the existing engine model with key \"{}\"",
+                apexModel.getKey().getId(), currentModel.getKey().getId());
         } else {
             throw new ContextException("apex model update failed, supplied model with key \""
-                            + apexModel.getKey().getId()
-                            + "\" is not a compatible model update from the existing engine model with key \""
-                            + currentModel.getKey().getId() + "\"");
+                + apexModel.getKey().getId()
+                + "\" is not a compatible model update from the existing engine model with key \""
+                + currentModel.getKey().getId() + "\"");
         }
     }
 
@@ -470,16 +460,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         LOGGER.entry(engineKey);
 
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            String message = ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyPreambleNotFoundException(engineKey);
         }
 
         // Start the engine
@@ -523,15 +509,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         LOGGER.entry(engineKey);
 
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
-            throw new ApexException(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            throwEngineKeyPreambleNotFoundException(engineKey);
         }
 
         // Stop the engine
@@ -565,15 +548,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         LOGGER.entry(engineKey);
 
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
-            throw new ApexException(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            throwEngineKeyPreambleNotFoundException(engineKey);
         }
 
         // Clear the engine
@@ -606,14 +586,13 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     @Override
     public boolean isStarted(final AxArtifactKey engineKey) {
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
+            logWarningEngineKeyNotSpecified();
             return false;
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            logWarningEngineKeyPreambleNotFound(engineKey);
             return false;
         }
         return engineWorkerMap.get(engineKey).isStarted();
@@ -641,14 +620,13 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     @Override
     public boolean isStopped(final AxArtifactKey engineKey) {
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
+            logWarningEngineKeyNotSpecified();
             return true;
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            logWarningEngineKeyPreambleNotFound(engineKey);
             return true;
         }
         return engineWorkerMap.get(engineKey).isStopped();
@@ -661,13 +639,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     public void startPeriodicEvents(final long period) throws ApexException {
         // Check if periodic events are already started
         if (periodicEventGenerator != null) {
-            String message = "Periodic event geneation already running on engine " + engineServiceKey.getId() + ", "
-                            + periodicEventGenerator.toString();
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            String message = "Periodic event generation already running on engine " + engineServiceKey.getId() + ", "
+                + periodicEventGenerator.toString();
+            logWarnAndThrowException(message);
         }
 
-        // Set up periodic event execution, its a Java Timer/TimerTask
+        // Set up periodic event execution, it's a Java Timer/TimerTask
         periodicEventGenerator = new ApexPeriodicEventGenerator(this.getEngineServiceEventInterface(), period);
 
         // Record the periodic event period because it may have been set over the Web Socket admin
@@ -682,8 +659,8 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     public void stopPeriodicEvents() throws ApexException {
         // Check if periodic events are already started
         if (periodicEventGenerator == null) {
-            LOGGER.warn("Periodic event geneation not running on engine " + engineServiceKey.getId());
-            throw new ApexException("Periodic event geneation not running on engine " + engineServiceKey.getId());
+            String message = "Periodic event generation not running on engine " + engineServiceKey.getId();
+            logWarnAndThrowException(message);
         }
 
         // Stop periodic events
@@ -698,15 +675,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     @Override
     public String getStatus(final AxArtifactKey engineKey) throws ApexException {
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
-            throw new ApexException(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            throwEngineKeyPreambleNotFoundException(engineKey);
         }
         // Return the information for this worker
         return engineWorkerMap.get(engineKey).getStatus(engineKey);
@@ -714,7 +688,6 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
 
     /**
      * {@inheritDoc}.
-     *
      */
     @Override
     public List<AxEngineModel> getEngineStats() {
@@ -731,15 +704,12 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     @Override
     public String getRuntimeInfo(final AxArtifactKey engineKey) throws ApexException {
         if (engineKey == null) {
-            String message = ENGINE_KEY_NOT_SPECIFIED;
-            LOGGER.warn(message);
-            throw new ApexException(message);
+            throwEngineKeyNotSpecifiedException();
         }
 
         // Check if we have this key on our map
         if (!engineWorkerMap.containsKey(engineKey)) {
-            LOGGER.warn(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
-            throw new ApexException(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+            throwEngineKeyPreambleNotFoundException(engineKey);
         }
 
         // Return the information for this worker
@@ -752,14 +722,14 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
     @Override
     public void sendEvent(final ApexEvent event) {
         if (event == null) {
-            LOGGER.warn("Null events cannot be processed, in engine service " + engineServiceKey.getId());
+            LOGGER.warn("Null events cannot be processed, in engine service {}", engineServiceKey.getId());
             return;
         }
 
         // Check if we have this key on our map
         if (getState() == AxEngineState.STOPPED) {
-            LOGGER.warn("event " + event.getName() + " not processed, no engines on engine service "
-                            + engineServiceKey.getId() + " are running");
+            LOGGER.warn("event {} not processed, no engines on engine service {} are running", event.getName(),
+                engineServiceKey.getId());
             return;
         }
 
@@ -770,4 +740,27 @@ public final class EngineServiceImpl implements EngineService, EngineServiceEven
         // Add the incoming event to the queue, the next available worker will process it
         queue.add(event);
     }
+
+    private static void logWarningEngineKeyNotSpecified() {
+        LOGGER.warn(ENGINE_KEY_NOT_SPECIFIED);
+    }
+
+    private static void throwEngineKeyNotSpecifiedException() throws ApexException {
+        logWarningEngineKeyNotSpecified();
+        throw new ApexException(ENGINE_KEY_NOT_SPECIFIED);
+    }
+
+    private static void throwEngineKeyPreambleNotFoundException(AxArtifactKey engineKey) throws ApexException {
+        logWarningEngineKeyPreambleNotFound(engineKey);
+        throw new ApexException(ENGINE_KEY_PREAMBLE + engineKey.getId() + NOT_FOUND_SUFFIX);
+    }
+
+    private static void logWarningEngineKeyPreambleNotFound(AxArtifactKey engineKey) {
+        LOGGER.warn(ENGINE_KEY_PREAMBLE + "{}" + NOT_FOUND_SUFFIX, engineKey.getId());
+    }
+
+    private static void logWarnAndThrowException(String message) throws ApexException {
+        LOGGER.warn(message);
+        throw new ApexException(message);
+    }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexEventTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexEventTest.java
index 0f17bf193..ae6aac660 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexEventTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexEventTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -28,10 +28,10 @@ import java.util.Properties;
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
 import org.assertj.core.api.Assertions;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
-public class ApexEventTest {
+class ApexEventTest {
     private final Random random = new Random();
     private ApexEvent apexEvent;
 
@@ -40,63 +40,63 @@ public class ApexEventTest {
      *
      * @throws Exception when object is created
      */
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
         apexEvent =
             new ApexEvent("name", "version", "namespace", "source", "target", "");
 
     }
 
     @Test
-    public void invalidEventName() {
+    void invalidEventName() {
         final String name = "++" + RandomStringUtils.randomAlphabetic(5);
         Assertions.assertThatCode(() ->
-            apexEvent = new ApexEvent(name, "version", "namespace", "source", "target", ""))
+                apexEvent = new ApexEvent(name, "version", "namespace", "source", "target", ""))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void invalidEventVersion() {
+    void invalidEventVersion() {
         final String version = "++" + RandomStringUtils.randomAlphabetic(5);
         Assertions.assertThatCode(() ->
-            apexEvent = new ApexEvent("name", version, "namespace", "source", "target", ""))
+                apexEvent = new ApexEvent("name", version, "namespace", "source", "target", ""))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void invalidEventNamespace() {
+    void invalidEventNamespace() {
         final String namespace = "++" + RandomStringUtils.randomAlphabetic(5);
         Assertions.assertThatCode(() ->
-            apexEvent = new ApexEvent("name", "version", namespace, "source", "target", ""))
+                apexEvent = new ApexEvent("name", "version", namespace, "source", "target", ""))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void invalidEventSource() {
+    void invalidEventSource() {
         final String source = "++" + RandomStringUtils.randomAlphabetic(5);
         Assertions.assertThatCode(() ->
-            apexEvent = new ApexEvent("name", "version", "namespace", source, "target", ""))
+                apexEvent = new ApexEvent("name", "version", "namespace", source, "target", ""))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void invalidEventTarget() {
+    void invalidEventTarget() {
         final String target = "++" + RandomStringUtils.randomAlphabetic(5);
         Assertions.assertThatCode(() ->
-            apexEvent = new ApexEvent("name", "version", "namespace", "source", target, ""))
+                apexEvent = new ApexEvent("name", "version", "namespace", "source", target, ""))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void invalidEventStatus() {
+    void invalidEventStatus() {
         final String toscaPolicyState = "INVALID_STATUS";
         Assertions.assertThatCode(() ->
-                        apexEvent = new ApexEvent("name", "version", "namespace", "source", "target", toscaPolicyState))
-                .isInstanceOf(ApexEventException.class);
+                apexEvent = new ApexEvent("name", "version", "namespace", "source", "target", toscaPolicyState))
+            .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void setExecutionId() {
+    void setExecutionId() {
         final int executionId = random.nextInt();
         apexEvent.setExecutionId(executionId);
         final long actual = apexEvent.getExecutionId();
@@ -104,7 +104,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void setExecutionProperties() {
+    void setExecutionProperties() {
         final Properties properties = new Properties();
         apexEvent.setExecutionProperties(properties);
         final Properties actual = apexEvent.getExecutionProperties();
@@ -112,7 +112,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void setExceptionMessage() {
+    void setExceptionMessage() {
         final String message = RandomStringUtils.randomAlphabetic(25);
         apexEvent.setExceptionMessage(message);
         final String actual = apexEvent.getExceptionMessage();
@@ -120,7 +120,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void put() {
+    void put() {
         final String key = RandomStringUtils.randomAlphabetic(5);
         final Object event = new Object();
         apexEvent.put(key, event);
@@ -129,7 +129,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void put2() {
+    void put2() {
         final String key = "_#+@" + RandomStringUtils.randomAlphabetic(5);
         final Object event = new Object();
         apexEvent.put(key, event);
@@ -138,7 +138,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void putAll() {
+    void putAll() {
         final String key1 = RandomStringUtils.randomAlphabetic(5);
         final String key2 = RandomStringUtils.randomAlphabetic(6);
         final Object event1 = new Object();
@@ -152,7 +152,7 @@ public class ApexEventTest {
     }
 
     @Test
-    public void putAllOneInvalidKey() {
+    void putAllOneInvalidKey() {
         final String key1 = RandomStringUtils.randomAlphabetic(5);
         final String key2 = "_#+@" + RandomStringUtils.randomAlphabetic(6);
         final String key3 = RandomStringUtils.randomAlphabetic(7);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGeneratorTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGeneratorTest.java
index ee72e6ea4..017941414 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGeneratorTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/ApexPeriodicEventGeneratorTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,16 +22,16 @@
 package org.onap.policy.apex.service.engine.event;
 
 import java.util.Random;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentMatchers;
 import org.mockito.Mockito;
 import org.onap.policy.apex.service.engine.runtime.EngineServiceEventInterface;
 
-public class ApexPeriodicEventGeneratorTest {
+class ApexPeriodicEventGeneratorTest {
     private final Random random = new Random();
 
     @Test
-    public void run() throws ApexEventException {
+    void run() {
 
         final EngineServiceEventInterface engineServiceEventInterface = Mockito.mock(EngineServiceEventInterface.class);
         // don't want the timer to fire, so make it wait at least two seconds
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventConverterTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventConverterTest.java
index 6e346a2a0..5b20b6fc5 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventConverterTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventConverterTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020,2023 Nordix Foundation
+ *  Modifications Copyright (C) 2020, 2023-2024 Nordix Foundation
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -24,7 +24,7 @@ package org.onap.policy.apex.service.engine.event;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.Apex2JsonEventConverter;
 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.JsonEventProtocolParameters;
 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
@@ -33,10 +33,10 @@ import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParame
  * Test the JSON event converter corner cases.
  *
  */
-public class JsonEventConverterTest {
-    @SuppressWarnings("deprecation")
+class JsonEventConverterTest {
+
     @Test
-    public void testJsonEventConverter() {
+    void testJsonEventConverter() {
         Apex2JsonEventConverter converter = new Apex2JsonEventConverter();
 
         assertThatThrownBy(() -> converter.init(null))
@@ -52,11 +52,11 @@ public class JsonEventConverterTest {
             .hasMessage("error converting event \"1\" to a string");
         assertThatThrownBy(() -> converter.toApexEvent(null, "[{\"aKey\": 1},{\"aKey\": 2}]"))
             .hasMessageStartingWith("Failed to unmarshal JSON event")
-            .getCause().hasMessageStartingWith("event received without mandatory parameter \"name\" "
+            .cause().hasMessageContaining("event received without mandatory parameter \"name\" "
                             + "on configuration or on event");
         assertThatThrownBy(() -> converter.toApexEvent(null, "[1,2,3]"))
             .hasMessageStartingWith("Failed to unmarshal JSON event")
-            .getCause().hasMessageStartingWith("incoming event ([1,2,3]) is a JSON object array "
+            .cause().hasMessageContaining("incoming event ([1,2,3]) is a JSON object array "
                     + "containing an invalid object 1.0");
         assertThatThrownBy(() -> converter.fromApexEvent(null))
             .hasMessage("event processing failed, Apex event is null");
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerForPojoTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerForPojoTest.java
index 3bee638d8..076fd6e12 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerForPojoTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerForPojoTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020,2022-2023 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2022-2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,15 +22,15 @@
 package org.onap.policy.apex.service.engine.event;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.List;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.context.parameters.ContextParameterConstants;
 import org.onap.policy.apex.context.parameters.SchemaParameters;
 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
@@ -52,19 +52,19 @@ import org.slf4j.ext.XLoggerFactory;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class JsonEventHandlerForPojoTest {
+class JsonEventHandlerForPojoTest {
     private static final XLogger logger = XLoggerFactory.getXLogger(JsonEventHandlerForPojoTest.class);
 
     /**
      * Setup event model.
      *
-     * @throws IOException Signals that an I/O exception has occurred.
+     * @throws IOException        Signals that an I/O exception has occurred.
      * @throws ApexModelException the apex model exception
      */
-    @BeforeClass
-    public static void setupEventModel() throws IOException, ApexModelException {
+    @BeforeAll
+    static void setupEventModel() throws IOException, ApexModelException {
         final String policyModelString =
-                TextFileUtils.getTextFileAsString("src/test/resources/policymodels/PojoEventModel.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/policymodels/PojoEventModel.json");
         final ApexModelReader<AxPolicyModel> modelReader = new ApexModelReader<AxPolicyModel>(AxPolicyModel.class);
         modelReader.setValidate(false);
         final AxPolicyModel apexPolicyModel = modelReader.read(new ByteArrayInputStream(policyModelString.getBytes()));
@@ -76,8 +76,8 @@ public class JsonEventHandlerForPojoTest {
     /**
      * Initialize default schema parameters.
      */
-    @BeforeClass
-    public static void initializeDefaultSchemaParameters() {
+    @BeforeAll
+    static void initializeDefaultSchemaParameters() {
         ParameterService.clear();
         final SchemaParameters schemaParameters = new SchemaParameters();
         schemaParameters.setName(ContextParameterConstants.SCHEMA_GROUP_NAME);
@@ -87,8 +87,8 @@ public class JsonEventHandlerForPojoTest {
     /**
      * Teardown default schema parameters.
      */
-    @AfterClass
-    public static void teardownDefaultSchemaParameters() {
+    @AfterAll
+    static void teardownDefaultSchemaParameters() {
         ParameterService.deregister(ContextParameterConstants.SCHEMA_GROUP_NAME);
         ModelService.clear();
     }
@@ -97,10 +97,10 @@ public class JsonEventHandlerForPojoTest {
      * Test POJO to apex event and back.
      *
      * @throws ApexException the apex exception
-     * @throws IOException on IO exceptions
+     * @throws IOException   on IO exceptions
      */
     @Test
-    public void testJsonPojoToApexEvent() throws ApexException, IOException {
+    void testJsonPojoToApexEvent() throws ApexException, IOException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         assertNotNull(jsonEventConverter);
 
@@ -109,7 +109,7 @@ public class JsonEventHandlerForPojoTest {
         jsonEventConverter.init(pars);
 
         final String apexEventJsonStringIn =
-                TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoEvent.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoEvent.json");
 
         logger.debug("input event\n" + apexEventJsonStringIn);
 
@@ -148,10 +148,10 @@ public class JsonEventHandlerForPojoTest {
      * Test POJO List to apex event and back.
      *
      * @throws ApexException the apex exception
-     * @throws IOException on IO exceptions
+     * @throws IOException   on IO exceptions
      */
     @Test
-    public void testJsonPojoListToApexEvent() throws ApexException, IOException {
+    void testJsonPojoListToApexEvent() throws ApexException, IOException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         assertNotNull(jsonEventConverter);
 
@@ -160,7 +160,7 @@ public class JsonEventHandlerForPojoTest {
         jsonEventConverter.init(pars);
 
         final String apexEventJsonStringIn =
-                TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoListEvent.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoListEvent.json");
 
         logger.debug("input event\n" + apexEventJsonStringIn);
 
@@ -200,11 +200,11 @@ public class JsonEventHandlerForPojoTest {
      * Test POJO event with bad configurations.
      *
      * @throws ApexException the apex exception
-     * @throws IOException on IO exceptions
+     * @throws IOException   on IO exceptions
      */
     @SuppressWarnings("deprecation")
     @Test
-    public void testJsonBadPojoApexEvent() throws ApexException, IOException {
+    void testJsonBadPojoApexEvent() throws ApexException, IOException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         assertNotNull(jsonEventConverter);
 
@@ -213,7 +213,7 @@ public class JsonEventHandlerForPojoTest {
         jsonEventConverter.init(pars);
 
         final String apexEventJsonStringIn =
-                TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoEvent.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/events/TestPojoEvent.json");
 
         logger.debug("input event\n" + apexEventJsonStringIn);
 
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerTest.java
index a724b6da2..59b022a7c 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventHandlerTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020,2023 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2023-2024 Nordix Foundation.
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -23,19 +23,19 @@
 package org.onap.policy.apex.service.engine.event;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.context.parameters.ContextParameterConstants;
 import org.onap.policy.apex.context.parameters.SchemaParameters;
 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
@@ -58,19 +58,19 @@ import org.slf4j.ext.XLoggerFactory;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class JsonEventHandlerTest {
+class JsonEventHandlerTest {
     private static final XLogger logger = XLoggerFactory.getXLogger(JsonEventHandlerTest.class);
 
     /**
      * Setup event model.
      *
-     * @throws IOException Signals that an I/O exception has occurred.
+     * @throws IOException        Signals that an I/O exception has occurred.
      * @throws ApexModelException the apex model exception
      */
-    @BeforeClass
-    public static void setupEventModel() throws IOException, ApexModelException {
+    @BeforeAll
+    static void setupEventModel() throws IOException, ApexModelException {
         final String policyModelString =
-                TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModel.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModel.json");
         final ApexModelReader<AxPolicyModel> modelReader = new ApexModelReader<AxPolicyModel>(AxPolicyModel.class);
         final AxPolicyModel apexPolicyModel = modelReader.read(new ByteArrayInputStream(policyModelString.getBytes()));
 
@@ -81,8 +81,8 @@ public class JsonEventHandlerTest {
     /**
      * Initialize default schema parameters.
      */
-    @BeforeClass
-    public static void initializeDefaultSchemaParameters() {
+    @BeforeAll
+    static void initializeDefaultSchemaParameters() {
         ParameterService.clear();
         final SchemaParameters schemaParameters = new SchemaParameters();
         schemaParameters.setName(ContextParameterConstants.SCHEMA_GROUP_NAME);
@@ -92,8 +92,8 @@ public class JsonEventHandlerTest {
     /**
      * Teardown default schema parameters.
      */
-    @AfterClass
-    public static void teardownDefaultSchemaParameters() {
+    @AfterAll
+    static void teardownDefaultSchemaParameters() {
         ParameterService.deregister(ContextParameterConstants.SCHEMA_GROUP_NAME);
         ModelService.clear();
     }
@@ -104,7 +104,7 @@ public class JsonEventHandlerTest {
      * @throws ApexException the apex exception
      */
     @Test
-    public void testJsontoApexEvent() throws ApexException {
+    void testJsontoApexEvent() throws ApexException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         assertNotNull(jsonEventConverter);
         jsonEventConverter.init(new JsonEventProtocolParameters());
@@ -138,7 +138,7 @@ public class JsonEventHandlerTest {
      */
     @SuppressWarnings("deprecation")
     @Test
-    public void testJsontoApexBadEvent() throws ApexException {
+    void testJsontoApexBadEvent() throws ApexException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         assertNotNull(jsonEventConverter);
         jsonEventConverter.init(new JsonEventProtocolParameters());
@@ -222,7 +222,7 @@ public class JsonEventHandlerTest {
             jsonEventConverter.toApexEvent(null, apexEventJsonStringIn);
         }).hasMessageStartingWith("Failed to unmarshal JSON event")
             .getCause().hasMessageStartingWith("error parsing BasicEvent:0.0.1 "
-               + "event from Json. Field \"intPar\" is missing, but is mandatory.");
+                + "event from Json. Field \"intPar\" is missing, but is mandatory.");
         apexEventJsonStringIn1 = SupportJsonEventGenerator.jsonEventNullFields();
         event = jsonEventConverter.toApexEvent(null, apexEventJsonStringIn1).get(0);
         assertEquals(null, event.get("TestSlogan"));
@@ -244,7 +244,7 @@ public class JsonEventHandlerTest {
      * @throws ApexException the apex exception
      */
     @Test
-    public void testApexEventToJson() throws ApexException {
+    void testApexEventToJson() throws ApexException {
         final Apex2JsonEventConverter jsonEventConverter = new Apex2JsonEventConverter();
         jsonEventConverter.init(new JsonEventProtocolParameters());
         assertNotNull(jsonEventConverter);
@@ -253,8 +253,8 @@ public class JsonEventHandlerTest {
         basicEventMap.put("intPar", 12345);
 
         final ApexEvent basicEvent =
-               new ApexEvent("BasicEvent", "0.0.1", "org.onap.policy.apex.events", "test", "apex",
-                       AxToscaPolicyProcessingStatus.ENTRY.name());
+            new ApexEvent("BasicEvent", "0.0.1", "org.onap.policy.apex.events", "test", "apex",
+                AxToscaPolicyProcessingStatus.ENTRY.name());
         basicEvent.putAll(basicEventMap);
 
         final String apexEvent0000JsonString = (String) jsonEventConverter.fromApexEvent(basicEvent);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventProtocolPrametersTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventProtocolParametersTest.java
index bf19d3f0b..fa93c3789 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventProtocolPrametersTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonEventProtocolParametersTest.java
@@ -1,41 +1,41 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
+ * Modifications Copyright (C) 2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.service.engine.event;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.JsonEventProtocolParameters;
 
 /**
  * Test the JSON event parameters.
- *
  */
-public class JsonEventProtocolPrametersTest {
+class JsonEventProtocolParametersTest {
 
     @Test
-    public void testJsonParameters() {
+    void testJsonParameters() {
         assertNotNull(new JsonEventProtocolParameters());
-        
+
         JsonEventProtocolParameters params = new JsonEventProtocolParameters();
 
         params.setLabel("MyLabel");
@@ -44,22 +44,22 @@ public class JsonEventProtocolPrametersTest {
 
         params.setEventProtocolPluginClass("MyPluginClass");
         assertEquals("MyPluginClass", params.getEventProtocolPluginClass());
-        
+
         params.setNameAlias("MyNameAlias");
         assertEquals("MyNameAlias", params.getNameAlias());
-        
+
         params.setVersionAlias("MyVersionAlias");
         assertEquals("MyVersionAlias", params.getVersionAlias());
-        
+
         params.setNameSpaceAlias("MyNameSpaceAlias");
         assertEquals("MyNameSpaceAlias", params.getNameSpaceAlias());
-        
+
         params.setSourceAlias("MySourceAlias");
         assertEquals("MySourceAlias", params.getSourceAlias());
-        
+
         params.setTargetAlias("MyTargetAlias");
         assertEquals("MyTargetAlias", params.getTargetAlias());
-        
+
         params.setPojoField("MyPojoField");
         assertEquals("MyPojoField", params.getPojoField());
     }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonTaggedEventConsumerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonTaggedEventConsumerTest.java
index 3bdcf53d9..a7d77fb33 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonTaggedEventConsumerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/JsonTaggedEventConsumerTest.java
@@ -2,6 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
+ * Modifications Copyright (C) 2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,15 +22,15 @@
 
 package org.onap.policy.apex.service.engine.event;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.CharacterDelimitedTextBlockReader;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.TextBlock;
 
@@ -37,64 +38,61 @@ import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer
  * Test JSON Tagged Event Consumer.
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class JsonTaggedEventConsumerTest {
+class JsonTaggedEventConsumerTest {
 
     @Test
-    public void testGarbageText() throws IOException {
-        verifyNoEvent("testGarbageText", "hello there");
+    void testGarbageText() throws IOException {
+        verifyNoEvent("hello there");
     }
 
     @Test
-    public void testPartialEvent() throws IOException {
-        verifyNoEvent("testGarbageText", "\"TestTimestamp\": 1469781869268}");
+    void testPartialEvent() throws IOException {
+        verifyNoEvent("\"TestTimestamp\": 1469781869268}");
     }
 
     @Test
-    public void testFullEvent() throws IOException {
-        verifyMulti("testFullEvent", "{TestTimestamp\": 1469781869268}", "{TestTimestamp\": 1469781869268}");
+    void testFullEvent() throws IOException {
+        verifyMulti("{TestTimestamp\": 1469781869268}");
     }
 
     @Test
-    public void testFullEventGarbageBefore() throws IOException {
-        verifyMulti("testFullEventGarbageBefore", "Garbage{TestTimestamp\": 1469781869268}",
-                        "{TestTimestamp\": 1469781869268}");
+    void testFullEventGarbageBefore() throws IOException {
+        verifyMulti("Garbage{TestTimestamp\": 1469781869268}");
     }
 
     @Test
-    public void testFullEventGarbageBeforeAfter() throws IOException {
-        verifyMulti("testFullEventGarbageBeforeAfter", "Garbage{TestTimestamp\": 1469781869268}Rubbish",
-                        "{TestTimestamp\": 1469781869268}");
+    void testFullEventGarbageBeforeAfter() throws IOException {
+        verifyMulti("Garbage{TestTimestamp\": 1469781869268}Rubbish");
     }
 
     @Test
-    public void testFullEventGarbageAfter() throws IOException {
-        verifyMulti("testFullEventGarbageAfter", "{TestTimestamp\": 1469781869268}Rubbish",
-                        "{TestTimestamp\": 1469781869268}");
+    void testFullEventGarbageAfter() throws IOException {
+        verifyMulti("{TestTimestamp\": 1469781869268}Rubbish");
     }
 
-    private void verifyNoEvent(String testName, String input) throws IOException {
+    private void verifyNoEvent(String input) throws IOException {
         final InputStream jsonInputStream = new ByteArrayInputStream(input.getBytes());
 
         final CharacterDelimitedTextBlockReader taggedReader = new CharacterDelimitedTextBlockReader('{', '}');
         taggedReader.init(jsonInputStream);
 
         final TextBlock textBlock = taggedReader.readTextBlock();
-        assertNull(testName, textBlock.getText());
-        assertTrue(testName, textBlock.isEndOfText());
+        assertNull(textBlock.getText());
+        assertTrue(textBlock.isEndOfText());
     }
 
-    private void verifyMulti(String testName, String input, String expected) throws IOException {
+    private void verifyMulti(String input) throws IOException {
         final InputStream jsonInputStream = new ByteArrayInputStream(input.getBytes());
 
         final CharacterDelimitedTextBlockReader taggedReader = new CharacterDelimitedTextBlockReader('{', '}');
         taggedReader.init(jsonInputStream);
 
         TextBlock textBlock = taggedReader.readTextBlock();
-        assertEquals(testName, expected, textBlock.getText());
-        assertFalse(testName, textBlock.isEndOfText());
+        assertEquals("{TestTimestamp\": 1469781869268}", textBlock.getText());
+        assertFalse(textBlock.isEndOfText());
 
         textBlock = taggedReader.readTextBlock();
-        assertNull(testName, textBlock.getText());
-        assertTrue(testName, textBlock.isEndOfText());
+        assertNull(textBlock.getText());
+        assertTrue(textBlock.isEndOfText());
     }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PeeredReferenceTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PeeredReferenceTest.java
index cadb5c8a1..1e9c4a586 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PeeredReferenceTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PeeredReferenceTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -19,18 +19,18 @@
 
 package org.onap.policy.apex.service.engine.event;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.ApexFileEventConsumer;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.producer.ApexFileEventProducer;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
 
-public class PeeredReferenceTest {
+class PeeredReferenceTest {
 
     @Test
-    public void getPeeredConsumer() {
+    void getPeeredConsumer() {
         final ApexFileEventConsumer eventConsumer = new ApexFileEventConsumer();
         final ApexFileEventProducer eventProducer = new ApexFileEventProducer();
         final EventHandlerPeeredMode peeredMode = EventHandlerPeeredMode.REQUESTOR;
@@ -43,7 +43,7 @@ public class PeeredReferenceTest {
     }
 
     @Test
-    public void getPeeredProducer() {
+    void getPeeredProducer() {
         final ApexEventConsumer eventConsumer = new ApexFileEventConsumer();
         final ApexEventProducer eventProducer = new ApexFileEventProducer();
         final EventHandlerPeeredMode peeredMode = EventHandlerPeeredMode.SYNCHRONOUS;
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PluginFactoriesTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PluginFactoriesTest.java
index 514b3b1e5..bf894dce5 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PluginFactoriesTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/PluginFactoriesTest.java
@@ -2,6 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
+ * Modifications Copyright (C) 2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,10 +22,10 @@
 
 package org.onap.policy.apex.service.engine.event;
 
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.util.Map.Entry;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.EventConsumerFactory;
 import org.onap.policy.apex.service.engine.event.impl.EventProducerFactory;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
@@ -35,13 +36,14 @@ import org.onap.policy.common.parameters.ParameterException;
 
 /**
  * Test Plugin Factories.
+ *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  * @author John Keeney (john.keeney@ericsson.com)
  */
-public class PluginFactoriesTest {
+class PluginFactoriesTest {
 
     @Test
-    public void testEventConsumerFactory() throws ApexEventException, ParameterException {
+    void testEventConsumerFactory() throws ApexEventException, ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/factoryGoodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -49,13 +51,13 @@ public class PluginFactoriesTest {
 
         for (final Entry<String, EventHandlerParameters> ce : parameters.getEventInputParameters().entrySet()) {
             final ApexEventConsumer consumer = new EventConsumerFactory().createConsumer(
-                    parameters.getEngineServiceParameters().getName() + "_consumer_" + ce.getKey(), ce.getValue());
+                parameters.getEngineServiceParameters().getName() + "_consumer_" + ce.getKey(), ce.getValue());
             assertNotNull(consumer);
         }
 
         for (final Entry<String, EventHandlerParameters> pe : parameters.getEventOutputParameters().entrySet()) {
             final ApexEventProducer producer = new EventProducerFactory().createProducer(
-                    parameters.getEngineServiceParameters().getName() + "_producer_" + pe.getKey(), pe.getValue());
+                parameters.getEngineServiceParameters().getName() + "_producer_" + pe.getKey(), pe.getValue());
             assertNotNull(producer);
         }
     }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/SynchronousEventCacheTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/SynchronousEventCacheTest.java
index dd960b298..f8de7f561 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/SynchronousEventCacheTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/SynchronousEventCacheTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -25,25 +25,26 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 
 import java.util.Random;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.eventrequestor.EventRequestorConsumer;
 import org.onap.policy.apex.service.engine.event.impl.eventrequestor.EventRequestorProducer;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
 
-public class SynchronousEventCacheTest {
+class SynchronousEventCacheTest {
+
     private final Random random = new Random();
     private ApexEventConsumer consumer;
     private ApexEventProducer producer;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         consumer = new EventRequestorConsumer();
         producer = new EventRequestorProducer();
     }
 
     @Test
-    public void removedCachedFromApexNotExists() {
+    void removedCachedFromApexNotExists() {
         int timeout = random.nextInt(100);
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
@@ -54,7 +55,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void removeCachedFromApex() {
+    void removeCachedFromApex() {
         int timeout = random.nextInt(100);
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
@@ -67,7 +68,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void removedCachedToApexNotExists() {
+    void removedCachedToApexNotExists() {
         int timeout = random.nextInt(100);
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
@@ -78,7 +79,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void removeCachedToApex() {
+    void removeCachedToApex() {
         int timeout = random.nextInt(100);
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
@@ -91,7 +92,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void apexExistsFromApexNo() {
+    void apexExistsFromApexNo() {
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, 0);
@@ -101,7 +102,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void apexExistsFromApexYes() {
+    void apexExistsFromApexYes() {
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, 0);
@@ -112,7 +113,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void apexExistsToApexNo() {
+    void apexExistsToApexNo() {
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, 0);
@@ -122,7 +123,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void apexExistsToApexYes() {
+    void apexExistsToApexYes() {
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, 0);
@@ -133,7 +134,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void addEventsFromApexDuplicatedExecutionId() {
+    void addEventsFromApexDuplicatedExecutionId() {
         int timeout = random.nextInt(100);
         int executionId = random.nextInt();
         final SynchronousEventCache cache =
@@ -144,11 +145,11 @@ public class SynchronousEventCacheTest {
 
         final var obj2 = new Object();
         assertThatCode(() -> cache.cacheSynchronizedEventFromApex(executionId, obj2))
-                        .isInstanceOf(ApexEventRuntimeException.class);
+            .isInstanceOf(ApexEventRuntimeException.class);
     }
 
     @Test
-    public void stop() {
+    void stop() {
         int timeout = random.nextInt(100);
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, timeout);
@@ -157,7 +158,7 @@ public class SynchronousEventCacheTest {
     }
 
     @Test
-    public void stopNotEmpty() {
+    void stopNotEmpty() {
         final SynchronousEventCache cache =
             new SynchronousEventCache(EventHandlerPeeredMode.SYNCHRONOUS, consumer, producer, 2000);
         assertThatCode(() -> {
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactoryTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactoryTest.java
index 976376e5a..5bff54225 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactoryTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventConsumerFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -20,27 +20,27 @@
 package org.onap.policy.apex.service.engine.event.impl;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventConsumer;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperCarrierTechnologyParameters;
 import org.onap.policy.apex.service.parameters.carriertechnology.RestPluginCarrierTechnologyParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 
-public class EventConsumerFactoryTest {
+class EventConsumerFactoryTest {
     private EventConsumerFactory factory;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         factory = new EventConsumerFactory();
     }
 
     @Test
-    public void createConsumerNoTechnologyParameter() {
+    void createConsumerNoTechnologyParameter() {
         final String name = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters parameters = new EventHandlerParameters();
 
@@ -49,7 +49,7 @@ public class EventConsumerFactoryTest {
     }
 
     @Test
-    public void createConsumerNoConsumerPlugin() {
+    void createConsumerNoConsumerPlugin() {
         final String name = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters parameters = new EventHandlerParameters();
         parameters.setCarrierTechnologyParameters(new RestPluginCarrierTechnologyParameters());
@@ -59,7 +59,7 @@ public class EventConsumerFactoryTest {
     }
 
     @Test
-    public void createConsumerWrongPluginClassName() {
+    void createConsumerWrongPluginClassName() {
         final String name = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters parameters = new EventHandlerParameters();
         final RestPluginCarrierTechnologyParameters technologyParameters =
@@ -72,7 +72,7 @@ public class EventConsumerFactoryTest {
     }
 
     @Test
-    public void createConsumer() throws ApexEventException {
+    void createConsumer() throws ApexEventException {
         final String name = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters parameters = new EventHandlerParameters();
         parameters.setCarrierTechnologyParameters(new SuperDooperCarrierTechnologyParameters());
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactoryTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactoryTest.java
index 7e3cb5478..edd050e26 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactoryTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProducerFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -20,27 +20,27 @@
 package org.onap.policy.apex.service.engine.event.impl;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.ApexEventProducer;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperCarrierTechnologyParameters;
 import org.onap.policy.apex.service.parameters.carriertechnology.RestPluginCarrierTechnologyParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 
-public class EventProducerFactoryTest {
+class EventProducerFactoryTest {
     private EventProducerFactory factory;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         factory = new EventProducerFactory();
     }
 
     @Test
-    public void createConsumerNoTechnologyParameter() {
+    void createConsumerNoTechnologyParameter() {
         final EventHandlerParameters parameters = new EventHandlerParameters();
         final String name = RandomStringUtils.randomAlphabetic(4);
 
@@ -49,7 +49,7 @@ public class EventProducerFactoryTest {
     }
 
     @Test
-    public void createConsumerNoConsumerPlugin() {
+    void createConsumerNoConsumerPlugin() {
         final EventHandlerParameters parameters = new EventHandlerParameters();
         final String name = RandomStringUtils.randomAlphabetic(4);
         parameters.setCarrierTechnologyParameters(new RestPluginCarrierTechnologyParameters());
@@ -59,7 +59,7 @@ public class EventProducerFactoryTest {
     }
 
     @Test
-    public void createConsumerWrongProducerPluginName() {
+    void createConsumerWrongProducerPluginName() {
         final EventHandlerParameters parameters = new EventHandlerParameters();
         final RestPluginCarrierTechnologyParameters technologyParameters =
             new RestPluginCarrierTechnologyParameters();
@@ -72,7 +72,7 @@ public class EventProducerFactoryTest {
     }
 
     @Test
-    public void createConsumer() throws ApexEventException {
+    void createConsumer() throws ApexEventException {
         final EventHandlerParameters parameters = new EventHandlerParameters();
         parameters.setCarrierTechnologyParameters(new SuperDooperCarrierTechnologyParameters());
         final String name = RandomStringUtils.randomAlphabetic(4);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactoryTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactoryTest.java
index 8ed3a9fec..9fd74e28f 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactoryTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/EventProtocolFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -20,27 +20,27 @@
 package org.onap.policy.apex.service.engine.event.impl;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventProtocolConverter;
 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
 import org.onap.policy.apex.service.engine.event.impl.apexprotocolplugin.ApexEventProtocolParameters;
 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.JsonEventProtocolParameters;
 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
 
-public class EventProtocolFactoryTest {
+class EventProtocolFactoryTest {
     private EventProtocolFactory factory;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         factory = new EventProtocolFactory();
     }
 
     @Test
-    public void createConsumerNoConsumerPlugin() {
+    void createConsumerNoConsumerPlugin() {
         final EventProtocolParameters parameters = new ApexEventProtocolParameters();
         parameters.setEventProtocolPluginClass("");
         final String name = RandomStringUtils.randomAlphabetic(9);
@@ -50,7 +50,7 @@ public class EventProtocolFactoryTest {
     }
 
     @Test
-    public void createConsumer2() {
+    void createConsumer2() {
         final EventProtocolParameters parameters = new ApexEventProtocolParameters();
         final String name = RandomStringUtils.randomAlphabetic(9);
         parameters.setEventProtocolPluginClass("java.lang.Object");
@@ -60,7 +60,7 @@ public class EventProtocolFactoryTest {
     }
 
     @Test
-    public void createConsumer() {
+    void createConsumer() {
         final EventProtocolParameters parameters = new JsonEventProtocolParameters();
         final String name = RandomStringUtils.randomAlphabetic(9);
 
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/Apex2ApexEventConverterTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/Apex2ApexEventConverterTest.java
index 9a61f8739..210358fed 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/Apex2ApexEventConverterTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/Apex2ApexEventConverterTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -23,55 +23,55 @@ package org.onap.policy.apex.service.engine.event.impl.apexprotocolplugin;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatNoException;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertSame;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
 
 import java.util.List;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.model.basicmodel.concepts.AxToscaPolicyProcessingStatus;
 import org.onap.policy.apex.service.engine.event.ApexEvent;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.ApexEventList;
 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
 
-public class Apex2ApexEventConverterTest {
+class Apex2ApexEventConverterTest {
     private Apex2ApexEventConverter converter;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         converter = new Apex2ApexEventConverter();
     }
 
     @Test
-    public void initWithNull() {
+    void initWithNull() {
         assertThatThrownBy(() -> converter.init(null))
             .isInstanceOf(ApexEventRuntimeException.class);
     }
 
     @Test
-    public void init() {
+    void init() {
         assertThatNoException()
             .isThrownBy(() -> converter.init(new ApexEventProtocolParameters()));
     }
 
     @Test
-    public void toApexEventWithNull() {
+    void toApexEventWithNull() {
         final String eventName = RandomStringUtils.randomAlphanumeric(5);
         assertThatThrownBy(() -> converter.toApexEvent(eventName, null))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void toApexEventWithNonApexEvent() {
+    void toApexEventWithNonApexEvent() {
         final String eventName = RandomStringUtils.randomAlphanumeric(5);
         assertThatThrownBy(() -> converter.toApexEvent(eventName, new Object()))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void toApexEmptyEvent() throws ApexEventException {
+    void toApexEmptyEvent() throws ApexEventException {
         final String eventName = RandomStringUtils.randomAlphanumeric(4);
         final String name = RandomStringUtils.randomAlphanumeric(5);
         final String version = RandomStringUtils.randomAlphanumeric(6);
@@ -86,7 +86,7 @@ public class Apex2ApexEventConverterTest {
     }
 
     @Test
-    public void toApexEventWithApexAndOtherFields() throws ApexEventException {
+    void toApexEventWithApexAndOtherFields() throws ApexEventException {
         final String eventName = RandomStringUtils.randomAlphanumeric(4);
         final String name1 = RandomStringUtils.randomAlphanumeric(5);
         final String version1 = RandomStringUtils.randomAlphanumeric(6);
@@ -105,7 +105,7 @@ public class Apex2ApexEventConverterTest {
     }
 
     @Test
-    public void toApexEventWithApexAndList() throws ApexEventException {
+    void toApexEventWithApexAndList() throws ApexEventException {
         final String eventName = RandomStringUtils.randomAlphanumeric(4);
         final String name1 = RandomStringUtils.randomAlphanumeric(5);
         final String version1 = RandomStringUtils.randomAlphanumeric(6);
@@ -135,7 +135,7 @@ public class Apex2ApexEventConverterTest {
     }
 
     @Test
-    public void toApexEventWithApexAndListAndOtherFields() throws ApexEventException {
+    void toApexEventWithApexAndListAndOtherFields() throws ApexEventException {
         final String eventName = RandomStringUtils.randomAlphanumeric(4);
         final String name1 = RandomStringUtils.randomAlphanumeric(5);
         final String version1 = RandomStringUtils.randomAlphanumeric(6);
@@ -166,13 +166,13 @@ public class Apex2ApexEventConverterTest {
     }
 
     @Test
-    public void fromApexEventNull() {
+    void fromApexEventNull() {
         assertThatThrownBy(() -> converter.fromApexEvent(null))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void fromApexEvent() throws ApexEventException {
+    void fromApexEvent() throws ApexEventException {
         final String name1 = RandomStringUtils.randomAlphanumeric(5);
         final String version1 = RandomStringUtils.randomAlphanumeric(6);
         final String nameSpace1 = "a" + RandomStringUtils.randomAlphanumeric(7);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/ApexEventProtocolParametersTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/ApexEventProtocolParametersTest.java
index 8b39b0a74..d0d3de2fb 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/ApexEventProtocolParametersTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/apexprotocolplugin/ApexEventProtocolParametersTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -19,15 +19,15 @@
 
 package org.onap.policy.apex.service.engine.event.impl.apexprotocolplugin;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class ApexEventProtocolParametersTest {
+class ApexEventProtocolParametersTest {
 
     @Test
-    public void testNoArgConstructor() {
+    void testNoArgConstructor() {
         final ApexEventProtocolParameters apexEventProtocolParameters = new ApexEventProtocolParameters();
         final String actual = apexEventProtocolParameters.getLabel();
         final String pluginClass = apexEventProtocolParameters.getEventProtocolPluginClass();
@@ -37,7 +37,7 @@ public class ApexEventProtocolParametersTest {
     }
 
     @Test
-    public void testConstructor() {
+    void testConstructor() {
         final String expected = RandomStringUtils.randomAlphabetic(6);
         final ApexEventProtocolParameters apexEventProtocolParameters = new ApexEventProtocolParameters(expected);
         final String actual = apexEventProtocolParameters.getLabel();
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/enevent/ApexEvent2EnEventConverterTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/enevent/ApexEvent2EnEventConverterTest.java
index 4d36b7be4..03b622a5e 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/enevent/ApexEvent2EnEventConverterTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/enevent/ApexEvent2EnEventConverterTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,13 +21,13 @@
 package org.onap.policy.apex.service.engine.event.impl.enevent;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 
 import java.util.List;
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.core.engine.event.EnEvent;
 import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
 import org.onap.policy.apex.model.basicmodel.concepts.AxToscaPolicyProcessingStatus;
@@ -36,24 +36,24 @@ import org.onap.policy.apex.service.engine.event.ApexEvent;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
 
-public class ApexEvent2EnEventConverterTest {
+class ApexEvent2EnEventConverterTest {
     private ApexEvent2EnEventConverter converter;
     private final Random random = new Random();
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         converter = new ApexEvent2EnEventConverter(null);
     }
 
     @Test
-    public void toApexEventNull() {
+    void toApexEventNull() {
         final String eventName = RandomStringUtils.randomAlphabetic(3);
         assertThatThrownBy(() -> converter.toApexEvent(eventName, null))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void toApexEventWrongClass() throws ApexException {
+    void toApexEventWrongClass() throws ApexException {
         final String eventName = RandomStringUtils.randomAlphabetic(3);
         final String name = RandomStringUtils.randomAlphanumeric(5);
         final String version = RandomStringUtils.randomAlphanumeric(6);
@@ -69,7 +69,7 @@ public class ApexEvent2EnEventConverterTest {
     }
 
     @Test
-    public void toApex() throws ApexException {
+    void toApex() throws ApexException {
         // prepare String values for events
         final String name = RandomStringUtils.randomAlphabetic(5);
         final String version = RandomStringUtils.randomAlphabetic(6);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorCarrierTechnologyParametersTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorCarrierTechnologyParametersTest.java
index 878756383..63248045b 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorCarrierTechnologyParametersTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorCarrierTechnologyParametersTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -20,23 +20,23 @@
 
 package org.onap.policy.apex.service.engine.event.impl.eventrequestor;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.parameters.ValidationResult;
 
-public class EventRequestorCarrierTechnologyParametersTest {
+class EventRequestorCarrierTechnologyParametersTest {
 
     @Test
-    public void getName() {
+    void getName() {
         final EventRequestorCarrierTechnologyParameters parameters = new EventRequestorCarrierTechnologyParameters();
         final String actual = parameters.getName();
         assertEquals(EventRequestorCarrierTechnologyParameters.EVENT_REQUESTOR_CARRIER_TECHNOLOGY_LABEL, actual);
     }
 
     @Test
-    public void validate() {
+    void validate() {
         final EventRequestorCarrierTechnologyParameters parameters = new EventRequestorCarrierTechnologyParameters();
         final ValidationResult actual = parameters.validate();
         assertNotNull(actual);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorConsumerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorConsumerTest.java
index dd44da7dd..fc79d1dca 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorConsumerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorConsumerTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -20,11 +20,11 @@
 package org.onap.policy.apex.service.engine.event.impl.eventrequestor;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.PeeredReference;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.ApexFileEventConsumer;
@@ -32,16 +32,16 @@ import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.producer
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
 
-public class EventRequestorConsumerTest {
+class EventRequestorConsumerTest {
     private EventRequestorConsumer consumer;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         consumer = new EventRequestorConsumer();
     }
 
     @Test
-    public void initNoCarrierTechnologyParameters() {
+    void initNoCarrierTechnologyParameters() {
         final String consumerName = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
 
@@ -50,7 +50,7 @@ public class EventRequestorConsumerTest {
     }
 
     @Test
-    public void initNoPeered() {
+    void initNoPeered() {
         final String consumerName = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
         eventHandlerParameters.setCarrierTechnologyParameters(new EventRequestorCarrierTechnologyParameters());
@@ -60,7 +60,7 @@ public class EventRequestorConsumerTest {
     }
 
     @Test
-    public void getName() throws ApexEventException {
+    void getName() throws ApexEventException {
         final String consumerName = RandomStringUtils.randomAlphabetic(6);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
         eventHandlerParameters.setCarrierTechnologyParameters(new EventRequestorCarrierTechnologyParameters());
@@ -73,7 +73,7 @@ public class EventRequestorConsumerTest {
     }
 
     @Test
-    public void getSetPeeeredReference() {
+    void getSetPeeeredReference() {
         final PeeredReference peeredReference =
             new PeeredReference(EventHandlerPeeredMode.REQUESTOR, new ApexFileEventConsumer(),
                 new ApexFileEventProducer());
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorProducerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorProducerTest.java
index 5abf28ee6..0613efa5b 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorProducerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/eventrequestor/EventRequestorProducerTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,17 +21,17 @@
 package org.onap.policy.apex.service.engine.event.impl.eventrequestor;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.ArgumentMatchers.any;
 
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
 import org.mockito.Mockito;
-import org.mockito.junit.MockitoJUnitRunner;
+import org.mockito.junit.jupiter.MockitoExtension;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.ApexEventProducer;
 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
@@ -41,8 +41,9 @@ import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
 
-@RunWith(MockitoJUnitRunner.class)
-public class EventRequestorProducerTest {
+@ExtendWith(MockitoExtension.class)
+class EventRequestorProducerTest {
+
     private final Random random = new Random();
     private EventRequestorProducer producer;
 
@@ -51,13 +52,13 @@ public class EventRequestorProducerTest {
     @Mock
     private EventRequestorConsumer apexConsumer;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         producer = new EventRequestorProducer();
     }
 
     @Test
-    public void initWithEmptyParams() {
+    void initWithEmptyParams() {
         final String producerName = RandomStringUtils.random(4);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
 
@@ -66,7 +67,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void initNotPeered() {
+    void initNotPeered() {
         final String producerName = RandomStringUtils.random(4);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
         eventHandlerParameters.setCarrierTechnologyParameters(new EventRequestorCarrierTechnologyParameters());
@@ -76,7 +77,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void getName() throws ApexEventException {
+    void getName() throws ApexEventException {
         final String expected = RandomStringUtils.random(4);
         final EventHandlerParameters eventHandlerParameters = new EventHandlerParameters();
         eventHandlerParameters.setCarrierTechnologyParameters(new EventRequestorCarrierTechnologyParameters());
@@ -89,7 +90,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void getSetPeeredReference() {
+    void getSetPeeredReference() {
         final PeeredReference peeredReference = new PeeredReference(EventHandlerPeeredMode.SYNCHRONOUS, apexConsumer,
             apexProducer);
         producer.setPeeredReference(EventHandlerPeeredMode.SYNCHRONOUS, peeredReference);
@@ -99,7 +100,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void sendEventNoRequestor() {
+    void sendEventNoRequestor() {
         final int id = random.nextInt(1000);
 
         assertThatThrownBy(() -> producer.sendEvent(id, null, null, null))
@@ -107,7 +108,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void sendEventNoEventRequestorConsumer() {
+    void sendEventNoEventRequestorConsumer() {
         final int id = random.nextInt(1000);
 
         final ApexFileEventConsumer fileEventConsumer = Mockito.mock(ApexFileEventConsumer.class);
@@ -122,7 +123,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void sendEvent() {
+    void sendEvent() {
         final int id = random.nextInt(1000);
 
         final PeeredReference reference =
@@ -134,7 +135,7 @@ public class EventRequestorProducerTest {
     }
 
     @Test
-    public void sendEventCached() {
+    void sendEventCached() {
         final int id = random.nextInt(1000);
 
         // Set event cache
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/FileCarrierTechnologyParametersTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/FileCarrierTechnologyParametersTest.java
index 26445c1fb..86bd7952f 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/FileCarrierTechnologyParametersTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/FileCarrierTechnologyParametersTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,38 +22,40 @@ package org.onap.policy.apex.service.engine.event.impl.filecarrierplugin;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assume.assumeTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
 
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.parameters.ParameterRuntimeException;
 import org.onap.policy.common.parameters.ValidationResult;
 
-public class FileCarrierTechnologyParametersTest {
+class FileCarrierTechnologyParametersTest {
+
     private final Random random = new Random();
     private static final String APEX_RELATIVE_FILE_ROOT = "APEX_RELATIVE_FILE_ROOT";
     private final String defaultApesRelativeFileRoot = System.getProperty(APEX_RELATIVE_FILE_ROOT);
     private FileCarrierTechnologyParameters parameters;
     private File tempFile;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         parameters = new FileCarrierTechnologyParameters();
     }
 
     /**
      * Cleaning after testing.
      */
-    @After
-    public void tearDown() {
+    @AfterEach
+    void tearDown() {
         if (tempFile != null) {
-            tempFile.delete();
+            assertTrue(tempFile.delete());
         }
         if (defaultApesRelativeFileRoot != null) {
             System.setProperty(APEX_RELATIVE_FILE_ROOT, defaultApesRelativeFileRoot);
@@ -63,7 +65,7 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void getSetFileName() {
+    void getSetFileName() {
         final String fileName = RandomStringUtils.random(10);
         parameters.setFileName(fileName);
         assertThat(parameters.getFileName())
@@ -71,86 +73,86 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void isStandardIo() {
+    void isStandardIo() {
         assertThat(parameters.isStandardIo()).isFalse();
     }
 
     @Test
-    public void isStandardError() {
+    void isStandardError() {
         assertThat(parameters.isStandardError()).isFalse();
     }
 
     @Test
-    public void isStreamingMode() {
+    void isStreamingMode() {
         assertThat(parameters.isStreamingMode()).isFalse();
     }
 
     @Test
-    public void setStandardIo() {
+    void setStandardIo() {
         final boolean standardIo = random.nextBoolean();
         parameters.setStandardIo(standardIo);
         assertThat(parameters.isStandardIo()).isEqualTo(standardIo);
     }
 
     @Test
-    public void setStandardError() {
+    void setStandardError() {
         final boolean standardError = random.nextBoolean();
         parameters.setStandardError(standardError);
         assertThat(parameters.isStandardError()).isEqualTo(standardError);
     }
 
     @Test
-    public void getStartDelay() {
+    void getStartDelay() {
         assertThat(parameters.getStartDelay()).isZero();
     }
 
     @Test
-    public void setStartDelay() {
+    void setStartDelay() {
         final long delay = random.nextInt();
         parameters.setStartDelay(delay);
         assertThat(parameters.getStartDelay()).isEqualTo(delay);
     }
 
     @Test
-    public void getLabel() {
+    void getLabel() {
         final String label = RandomStringUtils.random(10);
         parameters.setLabel(label);
         assertThat(parameters.getLabel()).isEqualTo(label);
     }
 
     @Test
-    public void setName() {
+    void setName() {
         final String name = RandomStringUtils.random(10);
         assertThatThrownBy(() -> parameters.setName(name)).isInstanceOf(ParameterRuntimeException.class);
     }
 
     @Test
-    public void getName() {
+    void getName() {
         final String label = RandomStringUtils.random(10);
         parameters.setLabel(label);
         assertThat(parameters.getName()).isEqualTo(label);
     }
 
     @Test
-    public void getStreamingMode() {
+    void getStreamingMode() {
         assertThat(parameters.isStreamingMode()).isFalse();
     }
 
     @Test
-    public void setStreamingMode() {
+    void setStreamingMode() {
         final boolean streamingMode = random.nextBoolean();
         parameters.setStreamingMode(streamingMode);
         assertThat(parameters.isStreamingMode()).isEqualTo(streamingMode);
     }
 
     @Test
-    public void validateFileNameNull() {
+    void validateFileNameNull() {
         final ValidationResult result = parameters.validate();
         assertThat(result.isValid()).isFalse();
     }
 
     @Test
-    public void validateFileNameAbsolutePath() throws IOException {
+    void validateFileNameAbsolutePath() throws IOException {
         tempFile = File.createTempFile("test_", ".tmp");
         parameters.setFileName(tempFile.getAbsolutePath());
         final ValidationResult result = parameters.validate();
@@ -158,7 +160,7 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void validateFileNameAbsolutePathNotExisting() {
+    void validateFileNameAbsolutePathNotExisting() {
         parameters.setFileName(RandomStringUtils.randomAlphabetic(5) + ".tmp");
         System.setProperty(APEX_RELATIVE_FILE_ROOT, System.getProperty("user.home"));
         final ValidationResult result = parameters.validate();
@@ -166,14 +168,14 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void validateDirectoryName() {
+    void validateDirectoryName() {
         parameters.setFileName(System.getProperty("user.dir"));
         final ValidationResult result = parameters.validate();
         assertThat(result.isValid()).isFalse();
     }
 
     @Test
-    public void validateParentNotDirectory() {
+    void validateParentNotDirectory() {
         final URL resource = FileCarrierTechnologyParameters.class
             .getResource("FileCarrierTechnologyParameters.class");
         assumeTrue(resource != null && "file".equalsIgnoreCase(resource.getProtocol()));
@@ -186,7 +188,7 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void validateParentDoesNOtExists() {
+    void validateParentDoesNOtExists() {
         final File fileParent = new File(System.getProperty("user.home"), RandomStringUtils.randomAlphabetic(6));
         final String fileName = RandomStringUtils.randomAlphabetic(5);
         final String absolutePath = new File(fileParent, fileName).getAbsolutePath();
@@ -196,27 +198,21 @@ public class FileCarrierTechnologyParametersTest {
     }
 
     @Test
-    public void validateDirectorNoSystemVariableSet() {
-        final ValidationResult result = parameters.validate();
-        assertThat(result.isValid()).isFalse();
-    }
-
-    @Test
-    public void validateStandardIo() {
+    void validateStandardIo() {
         parameters.setStandardIo(true);
         final ValidationResult result = parameters.validate();
         assertThat(result.isValid()).isTrue();
     }
 
     @Test
-    public void validateStandardError() {
+    void validateStandardError() {
         parameters.setStandardError(true);
         final ValidationResult result = parameters.validate();
         assertThat(result.isValid()).isTrue();
     }
 
     @Test
-    public void validateNegativeDelay() {
+    void validateNegativeDelay() {
         final long delay = random.nextInt() * -1;
         parameters.setStartDelay(delay);
         final ValidationResult result = parameters.validate();
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/ApexFileEventConsumerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/ApexFileEventConsumerTest.java
index 91e705624..385cbbb8a 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/ApexFileEventConsumerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/ApexFileEventConsumerTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,8 +26,8 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 import java.io.File;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.FileCarrierTechnologyParameters;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperCarrierTechnologyParameters;
@@ -36,7 +36,7 @@ import org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnolo
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolTextTokenDelimitedParameters;
 
-public class ApexFileEventConsumerTest {
+class ApexFileEventConsumerTest {
     private ApexFileEventConsumer consumer;
     private EventHandlerParameters handlerParameters;
     private File tempFile;
@@ -46,8 +46,8 @@ public class ApexFileEventConsumerTest {
      *
      * @throws Exception while file cannot be created
      */
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
         consumer = new ApexFileEventConsumer();
         handlerParameters = new EventHandlerParameters();
         tempFile = File.createTempFile("afec", ".tmp");
@@ -55,14 +55,14 @@ public class ApexFileEventConsumerTest {
     }
 
     @Test
-    public void initNoConsumerParameters() {
+    void initNoConsumerParameters() {
         final String name = RandomStringUtils.randomAlphanumeric(4);
         assertThatThrownBy(() -> consumer.init(name, null, null))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void initWrongCarrier() {
+    void initWrongCarrier() {
         final String name = RandomStringUtils.randomAlphanumeric(4);
         final CarrierTechnologyParameters technologyParameters = new SuperDooperCarrierTechnologyParameters();
         handlerParameters.setCarrierTechnologyParameters(technologyParameters);
@@ -72,32 +72,32 @@ public class ApexFileEventConsumerTest {
     }
 
     @Test
-    public void initWithoutReceiver() {
+    void initWithoutReceiver() {
         final String name = RandomStringUtils.randomAlphanumeric(4);
-        final EventHandlerParameters handlerParameters = new EventHandlerParameters();
+        final EventHandlerParameters parameters = new EventHandlerParameters();
         final FileCarrierTechnologyParameters technologyParameters = new FileCarrierTechnologyParameters();
         technologyParameters.setFileName(tempFile.getAbsolutePath());
         final EventProtocolTextTokenDelimitedParameters params = new SuperTokenDelimitedEventProtocolParameters();
 
-        handlerParameters.setCarrierTechnologyParameters(technologyParameters);
-        handlerParameters.setEventProtocolParameters(params);
+        parameters.setCarrierTechnologyParameters(technologyParameters);
+        parameters.setEventProtocolParameters(params);
 
-        assertThatCode(() -> consumer.init(name, handlerParameters, null))
+        assertThatCode(() -> consumer.init(name, parameters, null))
             .doesNotThrowAnyException();
     }
 
     @Test
-    public void getName() throws ApexEventException {
+    void getName() throws ApexEventException {
         final String name = RandomStringUtils.randomAlphabetic(5);
-        final EventHandlerParameters handlerParameters = new EventHandlerParameters();
+        final EventHandlerParameters parameters = new EventHandlerParameters();
         final FileCarrierTechnologyParameters technologyParameters = new FileCarrierTechnologyParameters();
         technologyParameters.setFileName(tempFile.getAbsolutePath());
         final EventProtocolTextTokenDelimitedParameters params = new SuperTokenDelimitedEventProtocolParameters();
 
-        handlerParameters.setCarrierTechnologyParameters(technologyParameters);
-        handlerParameters.setEventProtocolParameters(params);
+        parameters.setCarrierTechnologyParameters(technologyParameters);
+        parameters.setEventProtocolParameters(params);
 
-        consumer.init(name, handlerParameters, null);
+        consumer.init(name, parameters, null);
         assertThat(consumer.getName()).isEqualTo(name);
     }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/HeaderDelimitedTextBlockReaderTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/HeaderDelimitedTextBlockReaderTest.java
index 6c595072f..b230d52ab 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/HeaderDelimitedTextBlockReaderTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/HeaderDelimitedTextBlockReaderTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,23 +27,23 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 
-public class HeaderDelimitedTextBlockReaderTest {
+class HeaderDelimitedTextBlockReaderTest {
 
     @Test
-    public void readTextBlockWithDelimeter() throws IOException {
+    void readTextBlockWithDelimiter() throws IOException {
         final String startToken = RandomStringUtils.randomAlphabetic(5);
         final String endToken = RandomStringUtils.randomAlphabetic(6);
-        final boolean delimeter = true;
+        final boolean delimiter = true;
         final String text = RandomStringUtils.randomAlphanumeric(20);
         final String expected = startToken + text;
         // Prepare the stream
         final InputStream stream = new ByteArrayInputStream(expected.getBytes(StandardCharsets.UTF_8));
 
         final HeaderDelimitedTextBlockReader reader =
-            new HeaderDelimitedTextBlockReader(startToken, endToken, delimeter);
+            new HeaderDelimitedTextBlockReader(startToken, endToken, delimiter);
         reader.init(stream);
 
         final TextBlock textBlock = reader.readTextBlock();
@@ -51,10 +51,10 @@ public class HeaderDelimitedTextBlockReaderTest {
     }
 
     @Test
-    public void readTextBlockWithEndTokenDelimeter() throws IOException {
+    void readTextBlockWithEndTokenDelimiter() throws IOException {
         final String startToken = RandomStringUtils.randomAlphabetic(5);
         final String endToken = RandomStringUtils.randomAlphabetic(6);
-        final boolean delimeter = true;
+        final boolean delimiter = true;
         final String text = RandomStringUtils.randomAlphanumeric(20);
         final String input = startToken + "\n" + text + "\n" + endToken + "\n" + text;
         final String expected = startToken + "\n" + text + "\n" + endToken;
@@ -62,7 +62,7 @@ public class HeaderDelimitedTextBlockReaderTest {
         final InputStream stream = new ByteArrayInputStream(input.getBytes(StandardCharsets.UTF_8));
 
         final HeaderDelimitedTextBlockReader reader =
-            new HeaderDelimitedTextBlockReader(startToken, endToken, delimeter);
+            new HeaderDelimitedTextBlockReader(startToken, endToken, delimiter);
         reader.init(stream);
 
         final TextBlock textBlock = reader.readTextBlock();
@@ -70,16 +70,16 @@ public class HeaderDelimitedTextBlockReaderTest {
     }
 
     @Test
-    public void readTextBlockWithoutDelimeter() throws IOException {
+    void readTextBlockWithoutDelimiter() throws IOException {
         final String startToken = RandomStringUtils.randomAlphabetic(5);
         final String endToken = RandomStringUtils.randomAlphabetic(6);
-        final boolean delimeter = false;
+        final boolean delimiter = false;
         final String text = RandomStringUtils.randomAlphanumeric(20);
         // Prepare the stream
         final InputStream stream = new ByteArrayInputStream(text.getBytes(StandardCharsets.UTF_8));
 
         final HeaderDelimitedTextBlockReader reader =
-            new HeaderDelimitedTextBlockReader(startToken, endToken, delimeter);
+            new HeaderDelimitedTextBlockReader(startToken, endToken, delimiter);
         reader.init(stream);
 
         final TextBlock textBlock = reader.readTextBlock();
@@ -87,10 +87,10 @@ public class HeaderDelimitedTextBlockReaderTest {
     }
 
     @Test
-    public void readTextBlockWithEndTokenWithoutDelimeter() throws IOException {
+    void readTextBlockWithEndTokenWithoutDelimiter() throws IOException {
         final String startToken = RandomStringUtils.randomAlphabetic(5);
         final String endToken = RandomStringUtils.randomAlphabetic(6);
-        final boolean delimeter = false;
+        final boolean delimiter = false;
         final String text = RandomStringUtils.randomAlphanumeric(20);
         final String input = startToken + "\n" + text + "\n" + endToken + "\n" + text;
         final String expected = startToken + "\n" + text + "\n" + endToken;
@@ -98,7 +98,7 @@ public class HeaderDelimitedTextBlockReaderTest {
         final InputStream stream = new ByteArrayInputStream(input.getBytes(StandardCharsets.UTF_8));
 
         final HeaderDelimitedTextBlockReader reader =
-            new HeaderDelimitedTextBlockReader(startToken, endToken, delimeter);
+            new HeaderDelimitedTextBlockReader(startToken, endToken, delimiter);
         reader.init(stream);
 
         final TextBlock textBlock = reader.readTextBlock();
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockReaderFactoryTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockReaderFactoryTest.java
index 4fa42a727..0072535fb 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockReaderFactoryTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockReaderFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -26,24 +26,24 @@ import java.io.ByteArrayInputStream;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.impl.apexprotocolplugin.ApexEventProtocolParameters;
 import org.onap.policy.apex.service.engine.event.impl.jsonprotocolplugin.JsonEventProtocolParameters;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperTokenDelimitedEventProtocolParameters;
 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
 
-public class TextBlockReaderFactoryTest {
+class TextBlockReaderFactoryTest {
     private TextBlockReaderFactory factory;
 
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() {
         factory = new TextBlockReaderFactory();
     }
 
     @Test
-    public void getTaggedReaderTextCharDelimitedParametersParams() throws ApexEventException {
+    void getTaggedReaderTextCharDelimitedParametersParams() throws ApexEventException {
         final String text = RandomStringUtils.randomAlphanumeric(22);
         final InputStream inputStream = prepareInputStream(text);
         final EventProtocolParameters parameters = new JsonEventProtocolParameters();
@@ -53,7 +53,7 @@ public class TextBlockReaderFactoryTest {
     }
 
     @Test
-    public void getTaggedReaderTextTokenDelimitedParams() throws ApexEventException {
+    void getTaggedReaderTextTokenDelimitedParams() throws ApexEventException {
         final String text = RandomStringUtils.randomAlphanumeric(22);
         final InputStream inputStream = prepareInputStream(text);
         new ApexEventProtocolParameters();
@@ -64,7 +64,7 @@ public class TextBlockReaderFactoryTest {
     }
 
     @Test
-    public void getTaggedReaderNotSupportedParams() {
+    void getTaggedReaderNotSupportedParams() {
         final String text = RandomStringUtils.randomAlphanumeric(22);
         final InputStream inputStream = prepareInputStream(text);
         final EventProtocolParameters parameters = new ApexEventProtocolParameters();
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockTest.java
index 4390c3f3a..ff12c8860 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/consumer/TextBlockTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021  Nordix Foundation
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -19,17 +19,17 @@
 
 package org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class TextBlockTest {
+class TextBlockTest {
     private final Random random = new Random();
 
     @Test
-    public void isEndOfText() {
+    void isEndOfText() {
         final boolean endOfText = random.nextBoolean();
         final TextBlock textBlock = new TextBlock(endOfText, null);
 
@@ -37,7 +37,7 @@ public class TextBlockTest {
     }
 
     @Test
-    public void getText() {
+    void getText() {
         final boolean endOfText = random.nextBoolean();
         final String text = RandomStringUtils.randomAlphanumeric(8);
         final TextBlock textBlock = new TextBlock(endOfText, text);
@@ -46,7 +46,7 @@ public class TextBlockTest {
     }
 
     @Test
-    public void setText() {
+    void setText() {
         final boolean endOfText = random.nextBoolean();
         final String text = RandomStringUtils.randomAlphanumeric(8);
         final TextBlock textBlock = new TextBlock(endOfText, null);
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/producer/ApexFileEventProducerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/producer/ApexFileEventProducerTest.java
index 1ac1cdd7c..89ffca74b 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/producer/ApexFileEventProducerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/event/impl/filecarrierplugin/producer/ApexFileEventProducerTest.java
@@ -1,6 +1,6 @@
 /*
  *  ============LICENSE_START=======================================================
- *  Copyright (C) 2021. Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,16 +28,16 @@ import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 import java.util.Random;
 import org.apache.commons.lang3.RandomStringUtils;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.ApexEventException;
 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.FileCarrierTechnologyParameters;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperCarrierTechnologyParameters;
 import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
 
-public class ApexFileEventProducerTest {
+class ApexFileEventProducerTest {
     private final PrintStream out = System.out;
     private final Random random = new Random();
     private ApexFileEventProducer eventProducer;
@@ -47,27 +47,27 @@ public class ApexFileEventProducerTest {
     /**
      * Prepare for testing.
      */
-    @Before
-    public void setUp() {
+    @BeforeEach
+    void setUp() {
         eventProducer = new ApexFileEventProducer();
         parameters = new EventHandlerParameters();
         technologyParameters = new FileCarrierTechnologyParameters();
     }
 
-    @After
-    public void tearDown() {
+    @AfterEach
+    void tearDown() {
         System.setOut(out);
     }
 
     @Test
-    public void initNullParams() {
+    void initNullParams() {
         final String name = RandomStringUtils.randomAlphabetic(5);
         assertThatThrownBy(() -> eventProducer.init(name, null))
             .isInstanceOf(ApexEventException.class);
     }
 
     @Test
-    public void initParamsInvalidCarrier() {
+    void initParamsInvalidCarrier() {
         final String name = RandomStringUtils.randomAlphabetic(5);
         parameters.setCarrierTechnologyParameters(new SuperDooperCarrierTechnologyParameters());
         assertThatThrownBy(() -> eventProducer.init(name, parameters))
@@ -75,7 +75,7 @@ public class ApexFileEventProducerTest {
     }
 
     @Test
-    public void initParamsWithStandardError() {
+    void initParamsWithStandardError() {
         final String name = RandomStringUtils.randomAlphabetic(5);
         technologyParameters.setStandardError(true);
 
@@ -86,7 +86,7 @@ public class ApexFileEventProducerTest {
     }
 
     @Test
-    public void initParamsWithStandardIo() {
+    void initParamsWithStandardIo() {
         final String name = RandomStringUtils.randomAlphabetic(5);
         technologyParameters.setStandardIo(true);
 
@@ -96,7 +96,7 @@ public class ApexFileEventProducerTest {
     }
 
     @Test
-    public void initParamsWithFileIsDirectory() {
+    void initParamsWithFileIsDirectory() {
         final String name = RandomStringUtils.randomAlphabetic(5);
         final String fileName = System.getProperty("user.dir");
 
@@ -108,24 +108,14 @@ public class ApexFileEventProducerTest {
     }
 
     @Test
-    public void initParamsWithDelay() {
-        final String name = RandomStringUtils.randomAlphabetic(5);
-        technologyParameters.setStandardIo(true);
-        parameters.setCarrierTechnologyParameters(technologyParameters);
-
-        assertThatCode(() -> eventProducer.init(name, parameters))
-            .doesNotThrowAnyException();
-    }
-
-    @Test
-    public void sendEventWrongEvent() throws ApexEventException {
+    void sendEventWrongEvent() throws ApexEventException {
         final long executionId = random.nextLong();
         final String eventName = RandomStringUtils.randomAlphanumeric(4);
         final String producerName = RandomStringUtils.randomAlphanumeric(5);
         final Object event = new Object();
 
         technologyParameters.setStandardIo(true);
-        final EventHandlerParameters parameters = new EventHandlerParameters();
+        parameters = new EventHandlerParameters();
         parameters.setCarrierTechnologyParameters(technologyParameters);
 
         ApexFileEventProducer apexFileEventProducer = new ApexFileEventProducer();
@@ -135,7 +125,7 @@ public class ApexFileEventProducerTest {
     }
 
     @Test
-    public void sendEvent() throws ApexEventException {
+    void sendEvent() throws ApexEventException {
         // Prepare output stream to read data
         final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));
@@ -143,7 +133,7 @@ public class ApexFileEventProducerTest {
         // Prepare producer
         final String producerName = RandomStringUtils.randomAlphanumeric(5);
         technologyParameters.setStandardIo(true);
-        final EventHandlerParameters parameters = new EventHandlerParameters();
+        parameters = new EventHandlerParameters();
         parameters.setCarrierTechnologyParameters(technologyParameters);
         eventProducer.init(producerName, parameters);
 
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexCommandLineArgumentsTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexCommandLineArgumentsTest.java
index b5b68c9fc..5232c3845 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexCommandLineArgumentsTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexCommandLineArgumentsTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020-2021 Nordix Foundation.
+ *  Modifications Copyright (C) 2020-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -24,11 +24,10 @@ package org.onap.policy.apex.service.engine.main;
 
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.After;
-import org.junit.Test;
-import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.utils.cmd.CommandLineException;
 
 /**
@@ -36,14 +35,15 @@ import org.onap.policy.common.utils.cmd.CommandLineException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class ApexCommandLineArgumentsTest {
-    @After
-    public void clearRelativeFileRoot() {
+class ApexCommandLineArgumentsTest {
+
+    @AfterEach
+    void clearRelativeFileRoot() {
         System.clearProperty("APEX_RELATIVE_FILE_ROOT");
     }
 
     @Test
-    public void testCommandLineArguments() throws ApexException, CommandLineException {
+    void testCommandLineArguments() throws CommandLineException {
         final ApexCommandLineArguments apexArguments = new ApexCommandLineArguments();
 
         final String[] args01 = {"-h"};
@@ -68,74 +68,74 @@ public class ApexCommandLineArgumentsTest {
     }
 
     @Test
-    public void testCommandLineArgumentsExceptions() throws ApexException, CommandLineException {
+    void testCommandLineArgumentsExceptions() throws CommandLineException {
         final ApexCommandLineArguments apexArguments = new ApexCommandLineArguments();
 
         final String[] args00 = {""};
         apexArguments.parse(args00);
-        assertThatThrownBy(() -> apexArguments.validateInputFiles())
-                .hasMessage("Tosca Policy file was not specified as an argument");
+        assertThatThrownBy(apexArguments::validateInputFiles)
+            .hasMessage("Tosca Policy file was not specified as an argument");
 
         final String[] args05 = {"-a"};
         assertThatThrownBy(() -> apexArguments.parse(args05)).hasMessage("invalid command line arguments specified")
-                .hasRootCauseMessage("Unrecognized option: -a");
+            .hasRootCauseMessage("Unrecognized option: -a");
 
         final String[] args07 = {"-p", "goodbye", "-h", "aaa"};
         assertThatThrownBy(() -> apexArguments.parse(args07))
-                .hasMessage("too many command line arguments specified: [-p, goodbye, -h, aaa]");
+            .hasMessage("too many command line arguments specified: [-p, goodbye, -h, aaa]");
     }
 
     @Test
-    public void testCommandLineFileParameters() throws ApexException, CommandLineException {
+    void testCommandLineFileParameters() throws CommandLineException {
         final ApexCommandLineArguments apexArguments = new ApexCommandLineArguments();
 
         final String[] args02 = {"-p", "src/test/resources/parameters/goodParams.json"};
         apexArguments.parse(args02);
-        assertThatCode(() -> apexArguments.validateInputFiles()).doesNotThrowAnyException();
+        assertThatCode(apexArguments::validateInputFiles).doesNotThrowAnyException();
     }
 
     @Test
-    public void testCommandLineFileParametersExceptions() throws ApexException, CommandLineException {
+    void testCommandLineFileParametersExceptions() {
         final ApexCommandLineArguments apexArguments = new ApexCommandLineArguments();
 
         final String[] args00 = {"-c", "zooby"};
         assertThatThrownBy(() -> apexArguments.parse(args00)).hasMessage("invalid command line arguments specified")
-                .hasRootCauseMessage("Unrecognized option: -c");
+            .hasRootCauseMessage("Unrecognized option: -c");
 
         final String[] args01 = {"-p"};
         assertThatThrownBy(() -> apexArguments.parse(args01)).hasMessage("invalid command line arguments specified")
-                .hasRootCauseMessage("Missing argument for option: p");
+            .hasRootCauseMessage("Missing argument for option: p");
 
         final String[] args03 = {"-p", "src/test/resources/parameters/goodParams.json", "-m", "zooby"};
         assertThatThrownBy(() -> apexArguments.parse(args03)).hasMessage("invalid command line arguments specified")
-                .hasRootCauseMessage("Unrecognized option: -m");
+            .hasRootCauseMessage("Unrecognized option: -m");
     }
 
     @Test
-    public void testCommandLineRelativeRootParameters() throws ApexException, CommandLineException {
+    void testCommandLineRelativeRootParameters() throws CommandLineException {
         final ApexCommandLineArguments apexArguments = new ApexCommandLineArguments();
 
         final String[] args00 = {"-p", "src/test/resources/parameters/goodParams.json", "-rfr", "zooby"};
         apexArguments.parse(args00);
-        assertThatThrownBy(() -> apexArguments.validateInputFiles())
-                .hasMessageContaining("zooby\" does not exist or is not a directory");
+        assertThatThrownBy(apexArguments::validateInputFiles)
+            .hasMessageContaining("zooby\" does not exist or is not a directory");
 
         final String[] args01 = {"-rfr"};
         assertThatThrownBy(() -> apexArguments.parse(args01)).hasMessage("invalid command line arguments specified")
-                .hasRootCauseMessage("Missing argument for option: rfr");
+            .hasRootCauseMessage("Missing argument for option: rfr");
 
         final String[] args02 = {"-p", "src/test/resources/parameters/goodParams.json", "-rfr", "pom.xml"};
         apexArguments.parse(args02);
-        assertThatThrownBy(() -> apexArguments.validateInputFiles())
-                .hasMessageContaining("pom.xml\" does not exist or is not a directory");
+        assertThatThrownBy(apexArguments::validateInputFiles)
+            .hasMessageContaining("pom.xml\" does not exist or is not a directory");
 
         final String[] args03 = {"-p", "src/test/resources/parameters/goodParams.json", "-rfr", "target"};
         apexArguments.parse(args03);
-        assertThatCode(() -> apexArguments.validateInputFiles()).doesNotThrowAnyException();
+        assertThatCode(apexArguments::validateInputFiles).doesNotThrowAnyException();
 
         final String[] args04 = {"-p", "parameters/goodParamsRelative.json", "-rfr", "src/test/resources"};
         apexArguments.parse(args04);
-        assertThatCode(() -> apexArguments.validateInputFiles()).doesNotThrowAnyException();
+        assertThatCode(apexArguments::validateInputFiles).doesNotThrowAnyException();
 
     }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexMainTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexMainTest.java
index 29a3e0f00..f09dfd785 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexMainTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexMainTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020-2021 Nordix Foundation.
+ *  Modifications Copyright (C) 2020-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020-2021 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -25,25 +25,25 @@ package org.onap.policy.apex.service.engine.main;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.awaitility.Awaitility.await;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 import java.util.concurrent.TimeUnit;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
-import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.model.basicmodel.service.ModelService;
 import org.onap.policy.common.parameters.ParameterService;
 
 /**
  * Test the ApexMain class.
  */
-public class ApexMainTest {
+class ApexMainTest {
+
     private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
     private final PrintStream stdout = System.out;
     private ApexMain apexMain1;
@@ -54,8 +54,8 @@ public class ApexMainTest {
      *
      * @throws Exception if an error occurs
      */
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
         System.setOut(new PrintStream(outContent));
     }
 
@@ -64,8 +64,8 @@ public class ApexMainTest {
      *
      * @throws Exception if an error occurs
      */
-    @After
-    public void teardown() throws Exception {
+    @AfterEach
+    void teardown() throws Exception {
         if (null != apexMain1) {
             apexMain1.shutdown();
         }
@@ -76,46 +76,46 @@ public class ApexMainTest {
     }
 
     @Test
-    public void testNullParameters() throws ApexException {
+    void testNullParameters() {
         ApexMain.main(null);
         await().atMost(200, TimeUnit.MILLISECONDS).until(() -> outContent.toString()
-                .contains("Tosca Policy file was not specified as an argument"));
+            .contains("Tosca Policy file was not specified as an argument"));
         assertThat(outContent.toString())
             .contains("Tosca Policy file was not specified as an argument");
     }
 
     @Test
-    public void testBadArguments() throws ApexException {
-        String[] args = { "-whee" };
+    void testBadArguments() {
+        String[] args = {"-whee"};
 
         apexMain1 = new ApexMain(args);
         await().atMost(200, TimeUnit.MILLISECONDS).until(() -> outContent.toString()
-                .contains("invalid command line arguments specified"));
+            .contains("invalid command line arguments specified"));
         assertNotNull(apexMain1);
     }
 
     @Test
-    public void testHelp() throws ApexException {
-        String[] args = { "-h" };
+    void testHelp() {
+        String[] args = {"-h"};
 
         apexMain1 = new ApexMain(args);
         await().atMost(200, TimeUnit.MILLISECONDS).until(() -> outContent.toString()
-                .contains("usage: org.onap.policy.apex.service.engine.main.ApexMain [options...]"));
+            .contains("usage: org.onap.policy.apex.service.engine.main.ApexMain [options...]"));
         assertNotNull(apexMain1);
     }
 
     @Test
-    public void testBadParameters() throws ApexException {
-        String[] args = { "-p", "src/test/resources/parameters/badParams.json" };
+    void testBadParameters() {
+        String[] args = {"-p", "src/test/resources/parameters/badParams.json"};
 
         apexMain1 = new ApexMain(args);
         await().atMost(200, TimeUnit.MILLISECONDS).until(() -> outContent.toString()
-                .contains("item has status INVALID"));
+            .contains("item has status INVALID"));
         assertNotNull(apexMain1);
     }
 
     @Test
-    public void testCorrectParameters() throws ApexException {
+    void testCorrectParameters() {
         String[] args = {"-p", "src/test/resources/parameters/correctParams.json"};
 
         apexMain1 = new ApexMain(args);
@@ -126,7 +126,7 @@ public class ApexMainTest {
     }
 
     @Test
-    public void testJavaProperties() throws ApexException {
+    void testJavaProperties() {
         String[] args = {"-p", "src/test/resources/parameters/correctParamsJavaProperties.json"};
 
         apexMain1 = new ApexMain(args);
@@ -139,7 +139,7 @@ public class ApexMainTest {
     }
 
     @Test
-    public void testCorrectParametersWithMultiplePolicies() throws ApexException {
+    void testCorrectParametersWithMultiplePolicies() {
         String[] args1 = {"-p", "src/test/resources/parameters/correctParams.json"};
         String[] args2 = {"-p", "src/test/resources/parameters/correctParams2.json"};
         apexMain1 = new ApexMain(args1);
@@ -156,7 +156,7 @@ public class ApexMainTest {
     }
 
     @Test
-    public void testInCorrectParametersWithMultiplePolicies() throws ApexException {
+    void testInCorrectParametersWithMultiplePolicies() {
         String[] args = {"-p", "src/test/resources/parameters/correctParams.json"};
         apexMain1 = new ApexMain(args);
         apexMain2 = new ApexMain(args);
@@ -168,7 +168,7 @@ public class ApexMainTest {
     }
 
     @Test
-    public void testInvalidArgsWithMultiplePolicies() throws ApexException {
+    void testInvalidArgsWithMultiplePolicies() {
         String[] args = {"-c", "file1", "-m", "file2"};
         apexMain1 = new ApexMain(args);
         assertFalse(apexMain1.isAlive());
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexPolicyStatisticsManagerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexPolicyStatisticsManagerTest.java
index 6213cae1f..59ebfe50d 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexPolicyStatisticsManagerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/main/ApexPolicyStatisticsManagerTest.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021 Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021-2022 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,27 +21,27 @@
 
 package org.onap.policy.apex.service.engine.main;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import io.prometheus.client.CollectorRegistry;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.utils.resources.PrometheusUtils;
 
-public class ApexPolicyStatisticsManagerTest {
+class ApexPolicyStatisticsManagerTest {
 
     private ApexPolicyStatisticsManager statisticsManager;
 
     /**
      * Starts the statisticsManager object for tests.
      */
-    @Before
-    public void setup() {
+    @BeforeEach
+    void setup() {
         statisticsManager = new ApexPolicyStatisticsManager();
     }
 
     @Test
-    public void testUpdatePolicyDeployCounter() {
+    void testUpdatePolicyDeployCounter() {
         statisticsManager.updatePolicyDeployCounter(false);
         assertDeploys(1, 0, 1);
 
@@ -52,7 +52,7 @@ public class ApexPolicyStatisticsManagerTest {
     }
 
     @Test
-    public void testUpdatePolicyExecutedCounter() {
+    void testUpdatePolicyExecutedCounter() {
         statisticsManager.updatePolicyExecutedCounter(true);
         assertExecuted(1, 1, 0);
 
@@ -61,7 +61,7 @@ public class ApexPolicyStatisticsManagerTest {
     }
 
     @Test
-    public void testUpdatePolicyUndeployCounter() {
+    void testUpdatePolicyUndeployCounter() {
         statisticsManager.updatePolicyUndeployCounter(false);
         assertUndeploys(1, 0, 1);
 
@@ -91,11 +91,11 @@ public class ApexPolicyStatisticsManagerTest {
     private void checkDeploymentsMetrics(String operation) {
         final var defaultRegistry = CollectorRegistry.defaultRegistry;
         Double totalCount = defaultRegistry.getSampleValue("pdpa_policy_deployments_total",
-            new String[]{"operation", "status"}, new String[]{operation, "TOTAL"});
+            new String[] {"operation", "status"}, new String[] {operation, "TOTAL"});
         Double successCount = defaultRegistry.getSampleValue("pdpa_policy_deployments_total",
-            new String[]{"operation", "status"}, new String[]{operation, "SUCCESS"});
+            new String[] {"operation", "status"}, new String[] {operation, "SUCCESS"});
         Double failCount = defaultRegistry.getSampleValue("pdpa_policy_deployments_total",
-            new String[]{"operation", "status"}, new String[]{operation, "FAIL"});
+            new String[] {"operation", "status"}, new String[] {operation, "FAIL"});
 
         if (PrometheusUtils.DEPLOY_OPERATION.equals(operation)) {
             assertEquals(totalCount.intValue(), statisticsManager.getPolicyDeployCount());
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ApexParametersTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ApexParametersTest.java
index dd76374d8..20fea1ce7 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ApexParametersTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ApexParametersTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020,2022 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2022, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -25,13 +25,13 @@ package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
 import org.onap.policy.apex.service.parameters.ApexParameterHandler;
 import org.onap.policy.apex.service.parameters.ApexParameters;
@@ -40,10 +40,10 @@ import org.onap.policy.common.parameters.ParameterException;
 /**
  * Test the ApexParameters class.
  */
-public class ApexParametersTest {
+class ApexParametersTest {
 
     @Test
-    public void testJavaPropertiesOk() throws ParameterException {
+    void testJavaPropertiesOk() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/javaPropertiesOK.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -57,7 +57,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testJavaPropertiesEmpty() throws ParameterException {
+    void testJavaPropertiesEmpty() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/javaPropertiesEmpty.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -67,7 +67,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testJavaPropertiesBad() throws ParameterException {
+    void testJavaPropertiesBad() {
         final String[] args = {"-p", "src/test/resources/parameters/javaPropertiesBad.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -80,7 +80,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testPolicyModelFromMetadata() throws ParameterException {
+    void testPolicyModelFromMetadata() throws ParameterException {
         // Policy Models provided only in metadata.
         final String[] args = {"-p", "src/test/resources/parameters/policyModelFromMetadata.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
@@ -95,7 +95,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testPolicyModelFromProperties() throws ParameterException {
+    void testPolicyModelFromProperties() throws ParameterException {
         // Policy models provided in properties under EngineServiceParameters for backward compatibility
         final String[] args = {"-p", "src/test/resources/parameters/policyModelFromProperties.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
@@ -110,7 +110,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testPolicyModelFromPropertiesAndMetadata() throws ParameterException {
+    void testPolicyModelFromPropertiesAndMetadata() throws ParameterException {
         // Policy models provided in both properties and in metadata. policyModels in metadata takes precedence
         final String[] args = {"-p", "src/test/resources/parameters/policyModelMultiple.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
@@ -125,7 +125,7 @@ public class ApexParametersTest {
     }
 
     @Test
-    public void testGettersSetters() {
+    void testGettersSetters() {
         ApexParameters pars = new ApexParameters();
         assertNotNull(pars);
 
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ContextParameterTests.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ContextParameterTests.java
index a55afbed4..2c02f14ca 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ContextParameterTests.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ContextParameterTests.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -23,9 +23,10 @@
 package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperDistributorParameters;
 import org.onap.policy.apex.service.parameters.ApexParameterHandler;
@@ -37,10 +38,10 @@ import org.onap.policy.common.parameters.ParameterException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class ContextParameterTests {
+class ContextParameterTests {
 
     @Test
-    public void testNoParamsTest() {
+    void testNoParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextNoParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -51,18 +52,18 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testBadParamsTest() {
+    void testBadParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
         assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
-            .hasMessage("error reading parameters from \"src/test/resources/parameters/serviceContextBadParams.json\""
-                + "\n(ParameterRuntimeException):failed to deserialize the parameters for "
-                + "\"contextParameters\" to parameter class " + "\"hello\"\njava.lang.ClassNotFoundException: hello");
+            .hasMessageContaining("error reading parameters from "
+                + "\"src/test/resources/parameters/serviceContextBadParams.json\"")
+            .hasMessageContaining("class " + "\"hello\"\njava.lang.ClassNotFoundException: hello");
     }
 
     @Test
-    public void testBadPluginParamNameTest() {
+    void testBadPluginParamNameTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadPluginNameParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -74,19 +75,20 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testBadClassParamTest() {
+    void testBadClassParamTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadClassParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
-        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments)).hasMessage(
-            "error reading parameters from " + "\"src/test/resources/parameters/serviceContextBadClassParams.json\""
-                + "\n(ParameterRuntimeException):failed to deserialize " + "the parameters for \"contextParameters\""
-                + " to parameter class \"java.lang.Integer\"\ncom.google.gson.JsonSyntaxException: "
-                + "java.lang.IllegalStateException: Expected NUMBER but was BEGIN_OBJECT at path $");
+        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
+            .hasMessageContaining("error reading parameters from "
+                + "\"src/test/resources/parameters/serviceContextBadClassParams.json\"")
+            .hasMessageContaining("(ParameterRuntimeException):failed to deserialize the parameters for "
+                + "\"contextParameters\" to parameter class \"java.lang.Integer\"\ncom.google.gson.JsonSyntaxException"
+                + ": java.lang.IllegalStateException: Expected NUMBER but was BEGIN_OBJECT at path $");
     }
 
     @Test
-    public void testBadPluginClassTest() {
+    void testBadPluginClassTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadPluginClassParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -102,7 +104,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testOkFlushParamTest() throws ParameterException {
+    void testOkFlushParamTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextOKFlushParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -115,7 +117,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testOkDefaultParamTest() throws ParameterException {
+    void testOkDefaultParamTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextOKDefaultParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -128,7 +130,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testOkDistParamTest() throws ParameterException {
+    void testOkDistParamTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextOKDistParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -142,7 +144,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testOkFullDefaultParamTest() throws ParameterException {
+    void testOkFullDefaultParamTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/goodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -164,7 +166,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testOkFullParamTest() throws ParameterException {
+    void testOkFullParamTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextOKFullParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -186,13 +188,13 @@ public class ContextParameterTests {
             infinispanParameters.getClass().getName());
         assertEquals("my/lovely/configFile.xml", infinispanParameters.getConfigFile());
         assertEquals("holy/stone.xml", infinispanParameters.getJgroupsFile());
-        assertEquals(false, infinispanParameters.isPreferIPv4Stack());
+        assertFalse(infinispanParameters.isPreferIPv4Stack());
         assertEquals("fatherted", infinispanParameters.getJgroupsBindAddress());
 
     }
 
     @Test
-    public void testBadClassDistParamTest() {
+    void testBadClassDistParamTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadClassDistParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -207,7 +209,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testBadClassLockParamTest() {
+    void testBadClassLockParamTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadClassLockParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -222,7 +224,7 @@ public class ContextParameterTests {
     }
 
     @Test
-    public void testBadClassPersistParamTest() {
+    void testBadClassPersistParamTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceContextBadClassPersistParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ExecutorParameterTests.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ExecutorParameterTests.java
index 92a7b7d54..ad1dc442d 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ExecutorParameterTests.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ExecutorParameterTests.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -23,10 +23,10 @@
 package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import org.junit.After;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
 import org.onap.policy.apex.service.parameters.ApexParameterHandler;
 import org.onap.policy.apex.service.parameters.ApexParameters;
@@ -37,37 +37,38 @@ import org.onap.policy.common.parameters.ParameterException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class ExecutorParameterTests {
-    @After
-    public void resetRelativeFileRoot() {
+class ExecutorParameterTests {
+
+    @AfterEach
+    void resetRelativeFileRoot() {
         System.clearProperty("APEX_RELATIVE_FILE_ROOT");
     }
 
     @Test
-    public void testNoParamsTest() throws ParameterException {
+    void testNoParamsTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorNoParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
         final ApexParameters parameters = new ApexParameterHandler().getParameters(arguments);
         assertEquals(0,
-               parameters.getEngineServiceParameters().getEngineParameters().getExecutorParameterMap().size());
+            parameters.getEngineServiceParameters().getEngineParameters().getExecutorParameterMap().size());
 
     }
 
     @Test
-    public void testBadParamsTest() {
+    void testBadParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorBadParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
         assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
             .hasMessage("error reading parameters from "
-                    + "\"src/test/resources/parameters/serviceExecutorBadParams.json\"\n"
-                    + "(ParameterRuntimeException):value of \"executorParameters:ZOOBY\" entry is not "
-                    + "a parameter JSON object");
+                + "\"src/test/resources/parameters/serviceExecutorBadParams.json\"\n"
+                + "(ParameterRuntimeException):value of \"executorParameters:ZOOBY\" entry is not "
+                + "a parameter JSON object");
     }
 
     @Test
-    public void testNoExecutorParamsTest() {
+    void testNoExecutorParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorNoExecutorParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -79,7 +80,7 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testEmptyParamsTest() {
+    void testEmptyParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorEmptyParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -91,7 +92,7 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testBadPluginParamNameTest() {
+    void testBadPluginParamNameTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorBadPluginNameParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -103,7 +104,7 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testBadPluginParamObjectTest() {
+    void testBadPluginParamObjectTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorBadPluginValueObjectParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -115,7 +116,7 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testBadPluginParamBlankTest() {
+    void testBadPluginParamBlankTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorBadPluginValueBlankParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -127,20 +128,20 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testBadPluginParamValueTest() {
+    void testBadPluginParamValueTest() {
         final String[] args = {"-p", "src/test/resources/parameters/serviceExecutorBadPluginValueParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
         assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
-            .hasMessage("error reading parameters from"
-                + " \"src/test/resources/parameters/serviceExecutorBadPluginValueParams.json\"\n"
-                + "(ParameterRuntimeException):failed to deserialize the parameters "
+            .hasMessageContaining("error reading parameters from"
+                + " \"src/test/resources/parameters/serviceExecutorBadPluginValueParams.json\"\n")
+            .hasMessageContaining("(ParameterRuntimeException):failed to deserialize the parameters "
                 + "for \"executorParameters:LOOBY\" to parameter class \"helloworld\"\n"
                 + "java.lang.ClassNotFoundException: helloworld");
     }
 
     @Test
-    public void testGoodParametersTest() throws ParameterException {
+    void testGoodParametersTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/goodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -155,7 +156,7 @@ public class ExecutorParameterTests {
     }
 
     @Test
-    public void testRelativeParametersTest() throws ParameterException {
+    void testRelativeParametersTest() throws ParameterException {
         // @formatter:off
         final String[] args = {
             "-rfr",
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ParameterTests.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ParameterTests.java
index e37da3540..7257855a3 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ParameterTests.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ParameterTests.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  * Copyright (C) 2016-2018 Ericsson. All rights reserved.
- * Modifications Copyright (C) 2019-2020 Nordix Foundation.
+ * Modifications Copyright (C) 2019-2020, 2024 Nordix Foundation.
  * Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  * Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -24,13 +24,14 @@
 package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.nio.file.NoSuchFileException;
 import java.util.Arrays;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.ApexFileEventConsumer;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.producer.ApexFileEventProducer;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
@@ -48,9 +49,9 @@ import org.onap.policy.common.parameters.ParameterException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class ParameterTests {
+class ParameterTests {
     @Test
-    public void testInvalidParametersNoFileTest() throws ParameterException {
+    void testInvalidParametersNoFileTest() {
         final String[] args = {"-p", "src/test/resources/parameters/invalidNoFile.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -59,7 +60,7 @@ public class ParameterTests {
     }
 
     @Test
-    public void testInvalidParametersEmptyTest() {
+    void testInvalidParametersEmptyTest() {
         final String[] args = {"-p", "src/test/resources/parameters/empty.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -68,7 +69,7 @@ public class ParameterTests {
     }
 
     @Test
-    public void testInvalidParametersNoParamsTest() {
+    void testInvalidParametersNoParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/noParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -81,7 +82,7 @@ public class ParameterTests {
     }
 
     @Test
-    public void testInvalidParametersBlankParamsTest() {
+    void testInvalidParametersBlankParamsTest() {
         final String[] args = {"-p", "src/test/resources/parameters/blankParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -96,7 +97,7 @@ public class ParameterTests {
     }
 
     @Test
-    public void testInvalidParametersTest() {
+    void testInvalidParametersTest() {
         final String[] args = {"-p", "src/test/resources/parameters/badParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -109,15 +110,15 @@ public class ParameterTests {
             .hasMessageContaining("\"instanceCount\" value \"-345\" INVALID, is below the minimum")
             .hasMessageContaining("\"deploymentPort\" value \"65536\" INVALID, exceeds the maximum")
             .hasMessageContaining("eventOutputParameters", "FirstProducer", "EventHandlerParameters",
-                                    "FileCarrierTechnologyParameters")
+                "FileCarrierTechnologyParameters")
             .hasMessageContaining("\"fileName\" value \"null\" INVALID, is blank")
             .hasMessageContaining("eventInputParameters", "TheFileConsumer1", "EventHandlerParameters",
-                                    "FileCarrierTechnologyParameters")
+                "FileCarrierTechnologyParameters")
             .hasMessageContaining("\"fileName\" value \"null\" INVALID, is blank");
     }
 
     @Test
-    public void testGoodParametersTest() throws ParameterException {
+    void testGoodParametersTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/goodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -128,40 +129,40 @@ public class ParameterTests {
         assertTrue(parameters.getEventOutputParameters().containsKey("FirstProducer"));
         assertTrue(parameters.getEventOutputParameters().containsKey("MyOtherProducer"));
         assertEquals("FILE", parameters.getEventOutputParameters().get("FirstProducer")
-                .getCarrierTechnologyParameters().getLabel());
+            .getCarrierTechnologyParameters().getLabel());
         assertEquals("FILE", parameters.getEventOutputParameters().get("MyOtherProducer")
-                .getCarrierTechnologyParameters().getLabel());
+            .getCarrierTechnologyParameters().getLabel());
         assertEquals(ApexFileEventProducer.class.getName(), parameters.getEventOutputParameters()
-                .get("MyOtherProducer").getCarrierTechnologyParameters().getEventProducerPluginClass());
+            .get("MyOtherProducer").getCarrierTechnologyParameters().getEventProducerPluginClass());
         assertEquals(ApexFileEventConsumer.class.getName(), parameters.getEventOutputParameters()
-                .get("MyOtherProducer").getCarrierTechnologyParameters().getEventConsumerPluginClass());
+            .get("MyOtherProducer").getCarrierTechnologyParameters().getEventConsumerPluginClass());
         assertEquals("JSON",
-                parameters.getEventOutputParameters().get("FirstProducer").getEventProtocolParameters().getLabel());
+            parameters.getEventOutputParameters().get("FirstProducer").getEventProtocolParameters().getLabel());
         assertEquals("JSON", parameters.getEventOutputParameters().get("MyOtherProducer")
-                .getEventProtocolParameters().getLabel());
+            .getEventProtocolParameters().getLabel());
 
         assertTrue(parameters.getEventInputParameters().containsKey("TheFileConsumer1"));
         assertTrue(parameters.getEventInputParameters().containsKey("MySuperDooperConsumer1"));
         assertEquals("FILE", parameters.getEventInputParameters().get("TheFileConsumer1")
-                .getCarrierTechnologyParameters().getLabel());
+            .getCarrierTechnologyParameters().getLabel());
         assertEquals("SUPER_DOOPER", parameters.getEventInputParameters().get("MySuperDooperConsumer1")
-                .getCarrierTechnologyParameters().getLabel());
+            .getCarrierTechnologyParameters().getLabel());
         assertEquals("JSON", parameters.getEventInputParameters().get("TheFileConsumer1")
-                .getEventProtocolParameters().getLabel());
+            .getEventProtocolParameters().getLabel());
         assertEquals("SUPER_TOK_DEL", parameters.getEventInputParameters().get("MySuperDooperConsumer1")
-                .getEventProtocolParameters().getLabel());
+            .getEventProtocolParameters().getLabel());
         assertEquals(ApexFileEventProducer.class.getName(), parameters.getEventInputParameters()
-                .get("TheFileConsumer1").getCarrierTechnologyParameters().getEventProducerPluginClass());
+            .get("TheFileConsumer1").getCarrierTechnologyParameters().getEventProducerPluginClass());
         assertEquals(ApexFileEventConsumer.class.getName(), parameters.getEventInputParameters()
-                .get("TheFileConsumer1").getCarrierTechnologyParameters().getEventConsumerPluginClass());
+            .get("TheFileConsumer1").getCarrierTechnologyParameters().getEventConsumerPluginClass());
         assertEquals(SuperDooperEventProducer.class.getName(), parameters.getEventInputParameters()
-                .get("MySuperDooperConsumer1").getCarrierTechnologyParameters().getEventProducerPluginClass());
+            .get("MySuperDooperConsumer1").getCarrierTechnologyParameters().getEventProducerPluginClass());
         assertEquals(SuperDooperEventSubscriber.class.getName(), parameters.getEventInputParameters()
-                .get("MySuperDooperConsumer1").getCarrierTechnologyParameters().getEventConsumerPluginClass());
+            .get("MySuperDooperConsumer1").getCarrierTechnologyParameters().getEventConsumerPluginClass());
     }
 
     @Test
-    public void testSuperDooperParametersTest() throws ParameterException {
+    void testSuperDooperParametersTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/superDooperParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -174,23 +175,32 @@ public class ParameterTests {
         assertEquals(65522, parameters.getEngineServiceParameters().getDeploymentPort());
 
         final CarrierTechnologyParameters prodCarrierTech =
-                parameters.getEventOutputParameters().get("FirstProducer").getCarrierTechnologyParameters();
+            parameters.getEventOutputParameters().get("FirstProducer").getCarrierTechnologyParameters();
         final EventProtocolParameters prodEventProt =
-                parameters.getEventOutputParameters().get("FirstProducer").getEventProtocolParameters();
+            parameters.getEventOutputParameters().get("FirstProducer").getEventProtocolParameters();
         final CarrierTechnologyParameters consCarrierTech =
-                parameters.getEventInputParameters().get("MySuperDooperConsumer1").getCarrierTechnologyParameters();
+            parameters.getEventInputParameters().get("MySuperDooperConsumer1").getCarrierTechnologyParameters();
         final EventProtocolParameters consEventProt =
-                parameters.getEventInputParameters().get("MySuperDooperConsumer1").getEventProtocolParameters();
+            parameters.getEventInputParameters().get("MySuperDooperConsumer1").getEventProtocolParameters();
 
         assertEquals("SUPER_DOOPER", prodCarrierTech.getLabel());
         assertEquals("SUPER_TOK_DEL", prodEventProt.getLabel());
         assertEquals("SUPER_DOOPER", consCarrierTech.getLabel());
         assertEquals("JSON", consEventProt.getLabel());
 
-        assertTrue(prodCarrierTech instanceof SuperDooperCarrierTechnologyParameters);
+        assertInstanceOf(SuperDooperCarrierTechnologyParameters.class, prodCarrierTech);
 
         final SuperDooperCarrierTechnologyParameters superDooperParameters =
-                (SuperDooperCarrierTechnologyParameters) prodCarrierTech;
+            (SuperDooperCarrierTechnologyParameters) prodCarrierTech;
+        assertFalse(superDooperParameters.isEnableAutoCommit());
+        assertEqualsOnFields(superDooperParameters);
+
+        final String[] consumerTopics = {"consumer-out-0", "consumer-out-1", "consumer-out-2"};
+        assertEquals(Arrays.asList(consumerTopics), superDooperParameters.getConsumerTopicList());
+
+    }
+
+    private static void assertEqualsOnFields(SuperDooperCarrierTechnologyParameters superDooperParameters) {
         assertEquals("somehost:12345", superDooperParameters.getBootstrapServers());
         assertEquals("0", superDooperParameters.getAcks());
         assertEquals(25, superDooperParameters.getRetries());
@@ -198,7 +208,6 @@ public class ParameterTests {
         assertEquals(21, superDooperParameters.getLingerTime());
         assertEquals(50505050, superDooperParameters.getBufferMemory());
         assertEquals("first-group-id", superDooperParameters.getGroupId());
-        assertFalse(superDooperParameters.isEnableAutoCommit());
         assertEquals(441, superDooperParameters.getAutoCommitTime());
         assertEquals(987, superDooperParameters.getSessionTimeout());
         assertEquals("producer-out", superDooperParameters.getProducerTopic());
@@ -207,9 +216,5 @@ public class ParameterTests {
         assertEquals("some.value.serailizer", superDooperParameters.getValueSerializer());
         assertEquals("some.key.deserailizer", superDooperParameters.getKeyDeserializer());
         assertEquals("some.value.deserailizer", superDooperParameters.getValueDeserializer());
-
-        final String[] consumerTopics = {"consumer-out-0", "consumer-out-1", "consumer-out-2"};
-        assertEquals(Arrays.asList(consumerTopics), superDooperParameters.getConsumerTopicList());
-
     }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ProducerConsumerTests.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ProducerConsumerTests.java
index 0b05eac63..1f9a0d349 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ProducerConsumerTests.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/ProducerConsumerTests.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019-2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2019-2020, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -24,10 +24,11 @@
 package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.FileCarrierTechnologyParameters;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
 import org.onap.policy.apex.service.parameters.ApexParameterHandler;
@@ -39,9 +40,9 @@ import org.onap.policy.common.parameters.ParameterException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class ProducerConsumerTests {
+class ProducerConsumerTests {
     @Test
-    public void testGoodParametersTest() throws ParameterException {
+    void testGoodParametersTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/goodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -71,7 +72,7 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testNoCarrierTechnology() {
+    void testNoCarrierTechnology() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsNoCT.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -79,12 +80,12 @@ public class ProducerConsumerTests {
             .hasMessageContaining("src/test/resources/parameters/prodConsNoCT.json")
             .hasMessageContaining("ApexParameters")
             .hasMessageContaining("eventInputParameters", "aConsumer", "EventHandlerParameters",
-                            "carrierTechnologyParameters")
+                "carrierTechnologyParameters")
             .hasMessageContaining("is null");
     }
 
     @Test
-    public void testNoEventProcol() {
+    void testNoEventProcol() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsNoEP.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -92,15 +93,15 @@ public class ProducerConsumerTests {
             .hasMessageContaining("src/test/resources/parameters/prodConsNoEP.json")
             .hasMessageContaining("ApexParameters")
             .hasMessageContaining("eventOutputParameters", "aProducer", "EventHandlerParameters",
-                            "eventProtocolParameters")
+                "eventProtocolParameters")
             .hasMessageContaining("eventInputParameters", "aConsumer", "EventHandlerParameters",
-                            "FileCarrierTechnologyParameters", "fileName")
+                "FileCarrierTechnologyParameters", "fileName")
             .hasMessageContaining("is null")
             .hasMessageContaining("is blank");
     }
 
     @Test
-    public void testNoCarrierTechnologyParClass() {
+    void testNoCarrierTechnologyParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsNoCTParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -111,7 +112,7 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testMismatchCarrierTechnologyParClass() {
+    void testMismatchCarrierTechnologyParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsMismatchCTParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -124,14 +125,16 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testWrongTypeCarrierTechnologyParClass() {
+    void testWrongTypeCarrierTechnologyParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsWrongTypeCTParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
-        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments)).hasMessage(
-            "error reading parameters from " + "\"src/test/resources/parameters/prodConsWrongTypeCTParClass.json\"\n"
-                + "(ParameterRuntimeException):could not create default parameters for carrier technology "
-                + "\"SUPER_DOOPER\"\n" + "class org.onap.policy.apex.service.engine.parameters.dummyclasses."
+        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
+            .hasMessageContaining(
+            "error reading parameters from " + "\"src/test/resources/parameters/prodConsWrongTypeCTParClass.json\"\n")
+            .hasMessageContaining("(ParameterRuntimeException):could not create default parameters for "
+                + "carrier technology \"SUPER_DOOPER\"\n"
+                + "class org.onap.policy.apex.service.engine.parameters.dummyclasses."
                 + "SuperTokenDelimitedEventProtocolParameters cannot be cast to class "
                 + "org.onap.policy.apex.service.parameters.carriertechnology.CarrierTechnologyParameters (org.onap."
                 + "policy.apex.service.engine.parameters.dummyclasses.SuperTokenDelimitedEventProtocolParameters "
@@ -140,7 +143,7 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testOkFileNameCarrierTechnology() throws ParameterException {
+    void testOkFileNameCarrierTechnology() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsOKFileName.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -148,14 +151,14 @@ public class ProducerConsumerTests {
         final FileCarrierTechnologyParameters fileParams = (FileCarrierTechnologyParameters) parameters
             .getEventOutputParameters().get("aProducer").getCarrierTechnologyParameters();
         assertTrue(fileParams.getFileName().endsWith("target/aaa.json"));
-        assertEquals(false, fileParams.isStandardError());
-        assertEquals(false, fileParams.isStandardIo());
-        assertEquals(false, fileParams.isStreamingMode());
+        assertFalse(fileParams.isStandardError());
+        assertFalse(fileParams.isStandardIo());
+        assertFalse(fileParams.isStreamingMode());
 
     }
 
     @Test
-    public void testBadFileNameCarrierTechnology() {
+    void testBadFileNameCarrierTechnology() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsBadFileName.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -163,12 +166,12 @@ public class ProducerConsumerTests {
             .hasMessageContaining("src/test/resources/parameters/prodConsBadFileName.json")
             .hasMessageContaining("ApexParameters")
             .hasMessageContaining("eventOutputParameters", "aProducer", "EventHandlerParameters",
-                            "FileCarrierTechnologyParameters", "fileName")
+                "FileCarrierTechnologyParameters", "fileName")
             .hasMessageContaining("is blank");
     }
 
     @Test
-    public void testBadEventProtocolParClass() {
+    void testBadEventProtocolParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsBadEPParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -181,7 +184,7 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testNoEventProtocolParClass() {
+    void testNoEventProtocolParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsNoEPParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -192,7 +195,7 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testMismatchEventProtocolParClass() {
+    void testMismatchEventProtocolParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsMismatchEPParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -206,17 +209,19 @@ public class ProducerConsumerTests {
     }
 
     @Test
-    public void testWrongTypeEventProtocolParClass() {
+    void testWrongTypeEventProtocolParClass() {
         final String[] args = {"-p", "src/test/resources/parameters/prodConsWrongTypeEPParClass.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
-        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments)).hasMessage(
-            "error reading parameters from " + "\"src/test/resources/parameters/prodConsWrongTypeEPParClass.json\"\n"
-                + "(ParameterRuntimeException):could not create default parameters for event protocol "
-                + "\"SUPER_TOK_DEL\"\n" + "class org.onap.policy.apex.service.engine."
+        assertThatThrownBy(() -> new ApexParameterHandler().getParameters(arguments))
+            .hasMessageContaining("error reading parameters from "
+                + "\"src/test/resources/parameters/prodConsWrongTypeEPParClass.json\"\n")
+            .hasMessageContaining("(ParameterRuntimeException):could not create default parameters for event protocol "
+                + "\"SUPER_TOK_DEL\"\nclass org.onap.policy.apex.service.engine."
                 + "parameters.dummyclasses.SuperDooperCarrierTechnologyParameters "
                 + "cannot be cast to class org.onap.policy.apex.service."
-                + "parameters.eventprotocol.EventProtocolParameters (org.onap.policy.apex.service.engine.parameters"
+                + "parameters.eventprotocol.EventProtocolParameters ")
+            .hasMessageContaining("org.onap.policy.apex.service.engine.parameters"
                 + ".dummyclasses.SuperDooperCarrierTechnologyParameters and org.onap.policy.apex.service.parameters"
                 + ".eventprotocol.EventProtocolParameters are in unnamed module of loader 'app')");
     }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/SyncParameterTests.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/SyncParameterTests.java
index aaa98fd47..e9e989629 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/SyncParameterTests.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/parameters/SyncParameterTests.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019-2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2019-2020, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -24,11 +24,12 @@
 package org.onap.policy.apex.service.engine.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.Arrays;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexCommandLineArguments;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperDooperCarrierTechnologyParameters;
 import org.onap.policy.apex.service.engine.parameters.dummyclasses.SuperTokenDelimitedEventProtocolParameters;
@@ -44,9 +45,10 @@ import org.onap.policy.common.parameters.ParameterException;
  *
  * @author Liam Fallon (liam.fallon@ericsson.com)
  */
-public class SyncParameterTests {
+class SyncParameterTests {
+
     @Test
-    public void testSyncBadNoSyncWithPeer() throws ParameterException {
+    void testSyncBadNoSyncWithPeer() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsNoSyncWithPeer.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -58,7 +60,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncBadNotSyncWithPeer() throws ParameterException {
+    void testSyncBadNotSyncWithPeer() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsNotSyncWithPeer.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -70,7 +72,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncBadSyncBadPeers() throws ParameterException {
+    void testSyncBadSyncBadPeers() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsBadPeers.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -85,7 +87,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncBadSyncInvalidTimeout() throws ParameterException {
+    void testSyncBadSyncInvalidTimeout() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsInvalidTimeout.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -103,7 +105,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncBadSyncBadTimeout() throws ParameterException {
+    void testSyncBadSyncBadTimeout() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsBadTimeout.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -115,7 +117,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncBadSyncUnpairedTimeout() throws ParameterException {
+    void testSyncBadSyncUnpairedTimeout() {
         final String[] args = {"-p", "src/test/resources/parameters/syncBadParamsUnpairedTimeout.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -133,17 +135,17 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncGoodSyncGoodTimeoutProducer() throws ParameterException {
+    void testSyncGoodSyncGoodTimeoutProducer() throws ParameterException {
         verifySyncGoodSyncGoodTimeout("src/test/resources/parameters/syncGoodParamsProducerTimeout.json");
     }
 
     @Test
-    public void testSyncGoodSyncGoodTimeoutConsumer() throws ParameterException {
+    void testSyncGoodSyncGoodTimeoutConsumer() throws ParameterException {
         verifySyncGoodSyncGoodTimeout("src/test/resources/parameters/syncGoodParamsConsumerTimeout.json");
     }
 
     @Test
-    public void testSyncGoodSyncGoodTimeoutBoth() throws ParameterException {
+    void testSyncGoodSyncGoodTimeoutBoth() throws ParameterException {
         verifySyncGoodSyncGoodTimeout("src/test/resources/parameters/syncGoodParamsBothTimeout.json");
     }
 
@@ -152,18 +154,18 @@ public class SyncParameterTests {
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
         final ApexParameters parameters = new ApexParameterHandler().getParameters(arguments);
-        assertEquals(fileName, 12345, parameters.getEventInputParameters().get("SyncConsumer0")
-                .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
-        assertEquals(fileName, 1, parameters.getEventInputParameters().get("SyncConsumer1")
-                .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
-        assertEquals(fileName, 12345, parameters.getEventOutputParameters().get("SyncProducer0")
-                .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
-        assertEquals(fileName, 1, parameters.getEventOutputParameters().get("SyncProducer1")
-                .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
+        assertEquals(12345, parameters.getEventInputParameters().get("SyncConsumer0")
+            .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
+        assertEquals(1, parameters.getEventInputParameters().get("SyncConsumer1")
+            .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
+        assertEquals(12345, parameters.getEventOutputParameters().get("SyncProducer0")
+            .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
+        assertEquals(1, parameters.getEventOutputParameters().get("SyncProducer1")
+            .getPeerTimeout(EventHandlerPeeredMode.SYNCHRONOUS));
     }
 
     @Test
-    public void testSyncUnusedConsumerPeers() throws ParameterException {
+    void testSyncUnusedConsumerPeers() {
         final String[] args = {"-p", "src/test/resources/parameters/syncUnusedConsumerPeers.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -177,7 +179,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncMismatchedPeers() throws ParameterException {
+    void testSyncMismatchedPeers() {
         final String[] args = {"-p", "src/test/resources/parameters/syncMismatchedPeers.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -195,7 +197,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncUnusedProducerPeers() throws ParameterException {
+    void testSyncUnusedProducerPeers() {
         final String[] args = {"-p", "src/test/resources/parameters/syncUnusedProducerPeers.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -209,7 +211,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncMismatchedTimeout() throws ParameterException {
+    void testSyncMismatchedTimeout() {
         final String[] args = {"-p", "src/test/resources/parameters/syncMismatchedTimeout.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -223,7 +225,7 @@ public class SyncParameterTests {
     }
 
     @Test
-    public void testSyncGoodParametersTest() throws ParameterException {
+    void testSyncGoodParametersTest() throws ParameterException {
         final String[] args = {"-p", "src/test/resources/parameters/syncGoodParams.json"};
         final ApexCommandLineArguments arguments = new ApexCommandLineArguments(args);
 
@@ -236,21 +238,21 @@ public class SyncParameterTests {
         assertEquals(65522, parameters.getEngineServiceParameters().getDeploymentPort());
 
         final CarrierTechnologyParameters prodCT0 =
-                parameters.getEventOutputParameters().get("SyncProducer0").getCarrierTechnologyParameters();
+            parameters.getEventOutputParameters().get("SyncProducer0").getCarrierTechnologyParameters();
         final EventProtocolParameters prodEP0 =
-                parameters.getEventOutputParameters().get("SyncProducer0").getEventProtocolParameters();
+            parameters.getEventOutputParameters().get("SyncProducer0").getEventProtocolParameters();
         final CarrierTechnologyParameters consCT0 =
-                parameters.getEventInputParameters().get("SyncConsumer0").getCarrierTechnologyParameters();
+            parameters.getEventInputParameters().get("SyncConsumer0").getCarrierTechnologyParameters();
         final EventProtocolParameters consEP0 =
-                parameters.getEventInputParameters().get("SyncConsumer0").getEventProtocolParameters();
+            parameters.getEventInputParameters().get("SyncConsumer0").getEventProtocolParameters();
         final CarrierTechnologyParameters prodCT1 =
-                parameters.getEventOutputParameters().get("SyncProducer1").getCarrierTechnologyParameters();
+            parameters.getEventOutputParameters().get("SyncProducer1").getCarrierTechnologyParameters();
         final EventProtocolParameters prodEP1 =
-                parameters.getEventOutputParameters().get("SyncProducer1").getEventProtocolParameters();
+            parameters.getEventOutputParameters().get("SyncProducer1").getEventProtocolParameters();
         final CarrierTechnologyParameters consCT1 =
-                parameters.getEventInputParameters().get("SyncConsumer1").getCarrierTechnologyParameters();
+            parameters.getEventInputParameters().get("SyncConsumer1").getCarrierTechnologyParameters();
         final EventProtocolParameters consEP1 =
-                parameters.getEventInputParameters().get("SyncConsumer1").getEventProtocolParameters();
+            parameters.getEventInputParameters().get("SyncConsumer1").getEventProtocolParameters();
 
         assertEquals("FILE", prodCT0.getLabel());
         assertEquals("JSON", prodEP0.getLabel());
@@ -261,11 +263,18 @@ public class SyncParameterTests {
         assertEquals("SUPER_DOOPER", consCT1.getLabel());
         assertEquals("SUPER_TOK_DEL", consEP1.getLabel());
 
-        assertTrue(consCT1 instanceof SuperDooperCarrierTechnologyParameters);
-        assertTrue(consEP1 instanceof SuperTokenDelimitedEventProtocolParameters);
+        assertInstanceOf(SuperDooperCarrierTechnologyParameters.class, consCT1);
+        assertInstanceOf(SuperTokenDelimitedEventProtocolParameters.class, consEP1);
 
         final SuperDooperCarrierTechnologyParameters superDooperParameters =
-                (SuperDooperCarrierTechnologyParameters) consCT1;
+            (SuperDooperCarrierTechnologyParameters) consCT1;
+        assertEqualsOnFields(superDooperParameters);
+
+        final String[] consumerTopics = {"apex-in"};
+        assertEquals(Arrays.asList(consumerTopics), superDooperParameters.getConsumerTopicList());
+    }
+
+    private static void assertEqualsOnFields(SuperDooperCarrierTechnologyParameters superDooperParameters) {
         assertEquals("localhost:9092", superDooperParameters.getBootstrapServers());
         assertEquals("all", superDooperParameters.getAcks());
         assertEquals(0, superDooperParameters.getRetries());
@@ -279,15 +288,12 @@ public class SyncParameterTests {
         assertEquals("apex-out", superDooperParameters.getProducerTopic());
         assertEquals(100, superDooperParameters.getConsumerPollTime());
         assertEquals("org.apache.superDooper.common.serialization.StringSerializer",
-                superDooperParameters.getKeySerializer());
+            superDooperParameters.getKeySerializer());
         assertEquals("org.apache.superDooper.common.serialization.StringSerializer",
-                superDooperParameters.getValueSerializer());
+            superDooperParameters.getValueSerializer());
         assertEquals("org.apache.superDooper.common.serialization.StringDeserializer",
-                superDooperParameters.getKeyDeserializer());
+            superDooperParameters.getKeyDeserializer());
         assertEquals("org.apache.superDooper.common.serialization.StringDeserializer",
-                superDooperParameters.getValueDeserializer());
-
-        final String[] consumerTopics = {"apex-in"};
-        assertEquals(Arrays.asList(consumerTopics), superDooperParameters.getConsumerTopicList());
+            superDooperParameters.getValueDeserializer());
     }
 }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
index a903a885e..caba093ce 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020-2022 Nordix Foundation.
+ *  Modifications Copyright (C) 2020-2022, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020-2022 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -24,17 +24,18 @@
 package org.onap.policy.apex.service.engine.runtime.impl;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.context.parameters.ContextParameterConstants;
 import org.onap.policy.apex.context.parameters.ContextParameters;
 import org.onap.policy.apex.context.parameters.DistributorParameters;
@@ -59,7 +60,7 @@ import org.onap.policy.common.utils.resources.TextFileUtils;
 /**
  * Test the engine service implementation.
  */
-public class EngineServiceImplTest {
+class EngineServiceImplTest {
 
     private static String simpleModelString;
     private static String differentModelString;
@@ -71,8 +72,8 @@ public class EngineServiceImplTest {
      * @throws IOException on model reading errors
      * @throws ApexModelException on model reading exceptions
      */
-    @BeforeClass
-    public static void readSimpleModel() throws IOException, ApexModelException {
+    @BeforeAll
+    static void readSimpleModel() throws IOException, ApexModelException {
         simpleModelString = TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModel.json");
 
         differentModelString =
@@ -85,8 +86,8 @@ public class EngineServiceImplTest {
     /**
      * Initialize default parameters.
      */
-    @BeforeClass
-    public static void initializeDefaultParameters() {
+    @BeforeAll
+    static void initializeDefaultParameters() {
         ParameterService.clear();
         final SchemaParameters schemaParameters = new SchemaParameters();
         schemaParameters.setName(ContextParameterConstants.SCHEMA_GROUP_NAME);
@@ -110,30 +111,29 @@ public class EngineServiceImplTest {
 
         final EngineParameters engineParameters = new EngineParameters();
         engineParameters.setName(EngineParameterConstants.MAIN_GROUP_NAME);
+        ExecutorParameters jsExecutorParameters = getExecutorParameters("JAVASCRIPT");
+        engineParameters.getExecutorParameterMap().put("JAVASCRIPT", jsExecutorParameters);
+        getExecutorParameters("MVEL");
+        engineParameters.getExecutorParameterMap().put("MVEL", jsExecutorParameters);
+        ParameterService.register(engineParameters);
+    }
+
+    private static @NotNull ExecutorParameters getExecutorParameters(String lang) {
         ExecutorParameters jsExecutorParameters = new ExecutorParameters();
-        jsExecutorParameters.setName("JAVASCRIPT");
+        jsExecutorParameters.setName(lang);
         jsExecutorParameters
             .setTaskSelectionExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTse");
         jsExecutorParameters.setTaskExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTe");
         jsExecutorParameters
             .setStateFinalizerExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummySfe");
-        engineParameters.getExecutorParameterMap().put("JAVASCRIPT", jsExecutorParameters);
-        ExecutorParameters mvvelExecutorParameters = new ExecutorParameters();
-        mvvelExecutorParameters.setName("MVEL");
-        mvvelExecutorParameters
-            .setTaskSelectionExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTse");
-        mvvelExecutorParameters.setTaskExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTe");
-        mvvelExecutorParameters
-            .setStateFinalizerExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummySfe");
-        engineParameters.getExecutorParameterMap().put("MVEL", jsExecutorParameters);
-        ParameterService.register(engineParameters);
+        return jsExecutorParameters;
     }
 
     /**
      * Teardown default parameters.
      */
-    @AfterClass
-    public static void teardownDefaultParameters() {
+    @AfterAll
+    static void teardownDefaultParameters() {
         ParameterService.deregister(ContextParameterConstants.SCHEMA_GROUP_NAME);
         ParameterService.deregister(ContextParameterConstants.DISTRIBUTOR_GROUP_NAME);
         ParameterService.deregister(ContextParameterConstants.LOCKING_GROUP_NAME);
@@ -154,9 +154,9 @@ public class EngineServiceImplTest {
     }
 
     @Test
-    public void testEngineServiceImplSanity() throws ApexException {
+    void testEngineServiceImplSanity() throws ApexException {
         assertThatThrownBy(() -> EngineServiceImpl.create(null)).isInstanceOf(ApexException.class)
-            .hasMessage("engine service configuration parameters are null");
+            .hasMessage("Engine service configuration parameters are null");
 
         EngineServiceParameters invalidConfig = new EngineServiceParameters();
         invalidConfig.setInstanceCount(0);
@@ -212,7 +212,7 @@ public class EngineServiceImplTest {
     }
 
     @Test
-    public void testEngineServiceExceptions() throws ApexException {
+    void testEngineServiceExceptions() throws ApexException {
         EngineServiceParameters config = makeConfig();
         EngineServiceImpl esImpl = EngineServiceImpl.create(config);
         assertThatThrownBy(() -> esImpl.start(null)).isInstanceOf(ApexException.class)
@@ -225,7 +225,7 @@ public class EngineServiceImplTest {
             .isInstanceOf(ApexException.class).hasMessage("start()<-Engine-0:0.0.1,STOPPED,  cannot start engine, "
                 + "engine has not been initialized, its model is not loaded");
 
-        assertThatThrownBy(() -> esImpl.startAll()).isInstanceOf(ApexException.class)
+        assertThatThrownBy(esImpl::startAll).isInstanceOf(ApexException.class)
             .hasMessage("start()<-Engine-0:0.0.1,STOPPED,  cannot start engine, "
                 + "engine has not been initialized, its model is not loaded");
 
@@ -244,13 +244,13 @@ public class EngineServiceImplTest {
         esImpl.startPeriodicEvents(100000);
 
         assertThatThrownBy(() -> esImpl.startPeriodicEvents(100000)).isInstanceOf(ApexException.class)
-            .hasMessage("Periodic event geneation already running on engine Engine:0.0.1, ApexPeriodicEventGenerator "
+            .hasMessage("Periodic event generation already running on engine Engine:0.0.1, ApexPeriodicEventGenerator "
                 + "[period=100000, firstEventTime=0, lastEventTime=0, eventCount=0]");
 
         esImpl.stopPeriodicEvents();
 
-        assertThatThrownBy(() -> esImpl.stopPeriodicEvents()).isInstanceOf(ApexException.class)
-            .hasMessage("Periodic event geneation not running on engine Engine:0.0.1");
+        assertThatThrownBy(esImpl::stopPeriodicEvents).isInstanceOf(ApexException.class)
+            .hasMessage("Periodic event generation not running on engine Engine:0.0.1");
 
         assertThatThrownBy(() -> esImpl.clear(null)).isInstanceOf(ApexException.class)
             .hasMessage("engine key must be specified and may not be null");
@@ -296,7 +296,7 @@ public class EngineServiceImplTest {
     }
 
     @Test
-    public void testApexImplModelWIthModel() throws ApexException {
+    void testApexImplModelWIthModel() throws ApexException {
         EngineServiceParameters config = makeConfig();
         EngineServiceImpl esImpl = EngineServiceImpl.create(config);
         assertEquals("Engine:0.0.1", esImpl.getKey().getId());
@@ -387,6 +387,10 @@ public class EngineServiceImplTest {
             fail("test should not throw an exception");
         }
 
+        assertPeriodicEvents(esImpl);
+    }
+
+    private static void assertPeriodicEvents(EngineServiceImpl esImpl) throws ApexException {
         esImpl.startPeriodicEvents(100000);
         esImpl.stop();
         esImpl.startAll();
@@ -397,7 +401,7 @@ public class EngineServiceImplTest {
             esImpl.startPeriodicEvents(100000);
             fail("test should throw an exception");
         } catch (ApexException apEx) {
-            assertEquals("Periodic event geneation already running on engine Engine:0.0.1, ApexPeriodicEventGenerator "
+            assertEquals("Periodic event generation already running on engine Engine:0.0.1, ApexPeriodicEventGenerator "
                     + "[period=100000, firstEventTime=0, lastEventTime=0, eventCount=0]", apEx.getMessage());
         }
 
@@ -406,7 +410,7 @@ public class EngineServiceImplTest {
             esImpl.stopPeriodicEvents();
             fail("test should throw an exception");
         } catch (ApexException apEx) {
-            assertEquals("Periodic event geneation not running on engine Engine:0.0.1", apEx.getMessage());
+            assertEquals("Periodic event generation not running on engine Engine:0.0.1", apEx.getMessage());
         }
 
         try {
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineWorkerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineWorkerTest.java
index b23b3d4e6..0716e0ad3 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineWorkerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineWorkerTest.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2020,2022 Nordix Foundation.
+ *  Modifications Copyright (C) 2020, 2022-2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021-2022 Bell Canada Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,21 +22,23 @@
 
 package org.onap.policy.apex.service.engine.runtime.impl;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
-import org.junit.After;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.context.parameters.ContextParameterConstants;
 import org.onap.policy.apex.context.parameters.ContextParameters;
 import org.onap.policy.apex.context.parameters.DistributorParameters;
@@ -63,7 +65,7 @@ import org.onap.policy.common.utils.services.Registry;
 /**
  * Test the engine worker class.
  */
-public class EngineWorkerTest {
+class EngineWorkerTest {
     private final ApplicationThreadFactory atFactory = new ApplicationThreadFactory("apex-engine-service", 512);
 
     private static String simpleModelString;
@@ -73,15 +75,15 @@ public class EngineWorkerTest {
     /**
      * Read the models into strings.
      *
-     * @throws IOException on model reading errors
+     * @throws IOException        on model reading errors
      * @throws ApexModelException on model reading exceptions
      */
-    @BeforeClass
-    public static void readSimpleModel() throws IOException, ApexModelException {
+    @BeforeAll
+    static void readSimpleModel() throws IOException, ApexModelException {
         simpleModelString = TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModel.json");
 
         differentModelString =
-                TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModelDifferent.json");
+            TextFileUtils.getTextFileAsString("src/test/resources/policymodels/SmallModelDifferent.json");
 
         final ApexModelReader<AxPolicyModel> modelReader = new ApexModelReader<>(AxPolicyModel.class);
         simpleModel = modelReader.read(new ByteArrayInputStream(simpleModelString.getBytes()));
@@ -90,8 +92,8 @@ public class EngineWorkerTest {
     /**
      * Initialize default parameters.
      */
-    @BeforeClass
-    public static void initializeDefaultParameters() {
+    @BeforeAll
+    static void initializeDefaultParameters() {
         ParameterService.clear();
         final SchemaParameters schemaParameters = new SchemaParameters();
         schemaParameters.setName(ContextParameterConstants.SCHEMA_GROUP_NAME);
@@ -115,31 +117,30 @@ public class EngineWorkerTest {
 
         final EngineParameters engineParameters = new EngineParameters();
         engineParameters.setName(EngineParameterConstants.MAIN_GROUP_NAME);
-        ExecutorParameters jsExecutorParameters = new ExecutorParameters();
-        jsExecutorParameters.setName("JAVASCRIPT");
-        jsExecutorParameters
-                .setTaskSelectionExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTse");
-        jsExecutorParameters.setTaskExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTe");
-        jsExecutorParameters
-                .setStateFinalizerExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummySfe");
+        ExecutorParameters jsExecutorParameters = getExecutorParameters("JAVASCRIPT");
         engineParameters.getExecutorParameterMap().put("JAVASCRIPT", jsExecutorParameters);
-        ExecutorParameters mvvelExecutorParameters = new ExecutorParameters();
-        mvvelExecutorParameters.setName("MVEL");
-        mvvelExecutorParameters
-                .setTaskSelectionExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTse");
-        mvvelExecutorParameters.setTaskExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTe");
-        mvvelExecutorParameters
-                .setStateFinalizerExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummySfe");
+        getExecutorParameters("MVEL");
         engineParameters.getExecutorParameterMap().put("MVEL", jsExecutorParameters);
         ParameterService.register(engineParameters);
 
     }
 
+    private static @NotNull ExecutorParameters getExecutorParameters(String lang) {
+        ExecutorParameters jsExecutorParameters = new ExecutorParameters();
+        jsExecutorParameters.setName(lang);
+        jsExecutorParameters
+            .setTaskSelectionExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTse");
+        jsExecutorParameters.setTaskExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummyTe");
+        jsExecutorParameters
+            .setStateFinalizerExecutorPluginClass("org.onap.policy.apex.service.engine.runtime.impl.DummySfe");
+        return jsExecutorParameters;
+    }
+
     /**
      * Teardown default parameters.
      */
-    @AfterClass
-    public static void teardownDefaultParameters() {
+    @AfterAll
+    static void teardownDefaultParameters() {
         ParameterService.deregister(ContextParameterConstants.SCHEMA_GROUP_NAME);
         ParameterService.deregister(ContextParameterConstants.DISTRIBUTOR_GROUP_NAME);
         ParameterService.deregister(ContextParameterConstants.LOCKING_GROUP_NAME);
@@ -148,192 +149,59 @@ public class EngineWorkerTest {
         ParameterService.deregister(EngineParameterConstants.MAIN_GROUP_NAME);
     }
 
-    @After
-    public void cleardownTest() {
+    @AfterEach
+    void clearDownTest() {
         ModelService.clear();
     }
 
     @Test
-    public void testEngineWorker() {
+    void testEngineWorker() {
 
         BlockingQueue<ApexEvent> eventQueue = new LinkedBlockingQueue<>();
 
         EngineWorker worker = new EngineWorker(new AxArtifactKey("Worker", "0.0.1"), eventQueue, atFactory);
 
-        try {
-            worker.registerActionListener(null, null);
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("addEventListener()<-Worker:0.0.1,STOPPED, listenerName is null", apEx.getMessage());
-        }
+        assertThatThrownBy(() -> worker.registerActionListener(null, null))
+            .hasMessageContaining("addEventListener()<-Worker:0.0.1,STOPPED, listenerName is null");
 
         worker.registerActionListener("DummyListener", null);
 
-        try {
-            worker.registerActionListener(null, new DummyApexEventListener());
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("addEventListener()<-Worker:0.0.1,STOPPED, listenerName is null", apEx.getMessage());
-        }
+        assertThatThrownBy(() -> worker.registerActionListener(null, new DummyApexEventListener()))
+            .hasMessageContaining("addEventListener()<-Worker:0.0.1,STOPPED, listenerName is null");
 
         worker.registerActionListener("DummyListener", new DummyApexEventListener());
 
-        try {
-            worker.deregisterActionListener(null);
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("removeEventListener()<-Worker:0.0.1,STOPPED, listenerName is null", apEx.getMessage());
-        }
+        assertThatThrownBy(() -> worker.deregisterActionListener(null))
+            .hasMessageContaining("removeEventListener()<-Worker:0.0.1,STOPPED, listenerName is null");
 
         worker.deregisterActionListener("DummyListener");
 
-        try {
-            worker.getEngineServiceEventInterface();
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("getEngineServiceEventInterface() call is not allowed on an Apex Engine Worker",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.startPeriodicEvents(100000);
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("startPeriodicEvents() call is not allowed on an Apex Engine Worker", apEx.getMessage());
-        }
-
-        try {
-            worker.stopPeriodicEvents();
-            fail("test should throw an exception");
-        } catch (Exception apEx) {
-            assertEquals("stopPeriodicEvents() call is not allowed on an Apex Engine Worker", apEx.getMessage());
-        }
+        assertThatThrownBy(worker::getEngineServiceEventInterface)
+            .hasMessageContaining("getEngineServiceEventInterface() call is not allowed on an Apex Engine Worker");
+
+        assertThatThrownBy(() -> worker.startPeriodicEvents(100000))
+            .hasMessageContaining("startPeriodicEvents() call is not allowed on an Apex Engine Worker");
+
+        assertThatThrownBy(worker::stopPeriodicEvents)
+            .hasMessageContaining("stopPeriodicEvents() call is not allowed on an Apex Engine Worker");
 
         assertEquals("Worker:0.0.1", worker.getEngineKeys().iterator().next().getId());
 
         assertNull(worker.getApexModelKey());
 
-        String runtimeInfo = worker.getRuntimeInfo(worker.getEngineKeys().iterator().next());
-        assertEquals("{\"TimeStamp\":", runtimeInfo.replaceAll("\\s+", "").substring(0, 13));
+        assertEngineWorkerStartStop(worker);
 
-        assertEquals(AxEngineState.STOPPED, worker.getState());
+        assertThatThrownBy(() -> worker.clear(new AxArtifactKey("DummyKey", "0.0.1")))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
 
-        assertEquals("{\"TimeStamp\":", runtimeInfo.replaceAll("\\s+", "").substring(0, 13));
+        assertDoesNotThrow(() -> worker.clear(worker.getEngineKeys().iterator().next()));
+        assertDoesNotThrow(() -> worker.clear());
 
-        assertFalse(worker.isStarted());
-        assertFalse(worker.isStarted(null));
-        assertFalse(worker.isStarted(new AxArtifactKey("DummyKey", "0.0.1")));
-        assertFalse(worker.isStarted(worker.getEngineKeys().iterator().next()));
-        assertTrue(worker.isStopped());
-        assertTrue(worker.isStopped(null));
-        assertTrue(worker.isStopped(new AxArtifactKey("DummyKey", "0.0.1")));
-        assertTrue(worker.isStopped(worker.getEngineKeys().iterator().next()));
-
-        try {
-            worker.start(new AxArtifactKey("DummyKey", "0.0.1"));
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.start(worker.getEngineKeys().iterator().next());
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("start()<-Worker:0.0.1,STOPPED,  cannot start engine, engine has not been initialized, "
-                    + "its model is not loaded", apEx.getMessage());
-        }
-
-        try {
-            worker.startAll();
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("start()<-Worker:0.0.1,STOPPED,  cannot start engine, "
-                    + "engine has not been initialized, its model is not loaded", apEx.getMessage());
-        }
-
-        try {
-            worker.stop(new AxArtifactKey("DummyKey", "0.0.1"));
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.stop(worker.getEngineKeys().iterator().next());
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.stop();
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.clear(new AxArtifactKey("DummyKey", "0.0.1"));
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.clear(worker.getEngineKeys().iterator().next());
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.clear();
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), "", true);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("failed to unmarshal the apex model on engine DummyKey:0.0.1", apEx.getMessage());
-        }
-
-        try {
-            worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), "I am not an Apex model", true);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("failed to unmarshal the apex model on engine DummyKey:0.0.1", apEx.getMessage());
-        }
-
-        try {
-            worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), simpleModelString, true);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), (AxPolicyModel) null, true);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), simpleModel, true);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine",
-                    apEx.getMessage());
-        }
+        assertUpdateEngineModel(worker);
     }
 
     @Test
-    public void testApexImplModelWIthModel() throws ApexException {
+    void testApexImplModelWIthModel() throws ApexException {
         Registry.newRegistry();
         Registry.register(ApexPolicyStatisticsManager.REG_APEX_PDP_POLICY_COUNTER, new ApexPolicyStatisticsManager());
         BlockingQueue<ApexEvent> eventQueue = new LinkedBlockingQueue<>();
@@ -341,34 +209,18 @@ public class EngineWorkerTest {
         EngineWorker worker = new EngineWorker(new AxArtifactKey("Worker", "0.0.1"), eventQueue, atFactory);
         assertEquals("Worker:0.0.1", worker.getKey().getId());
 
-        try {
-            worker.updateModel(worker.getKey(), simpleModelString, false);
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
+        assertDoesNotThrow(() -> worker.updateModel(worker.getKey(), simpleModelString, false));
 
         eventQueue.add(new ApexEvent("SomeEvent", "0.0.1", "the.event.namespace", "EventSource", "EventTarget", ""));
 
-        try {
-            worker.updateModel(worker.getKey(), differentModelString, false);
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("apex model update failed, supplied model with key \"SmallModelDifferent:0.0.1\" is not a "
-                    + "compatible model update " + "from the existing engine model with key \"SmallModel:0.0.1\"",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.updateModel(worker.getKey(), differentModelString, true);
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.updateModel(worker.getKey(), simpleModelString, true);
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
+        assertThatThrownBy(() -> worker.updateModel(worker.getKey(), differentModelString, false))
+            .hasMessageContaining("apex model update failed, supplied model with key "
+                + "\"SmallModelDifferent:0.0.1\" is not a compatible model update "
+                + "from the existing engine model with key \"SmallModel:0.0.1\"");
+
+        assertDoesNotThrow(() -> worker.updateModel(worker.getKey(), differentModelString, true));
+
+        assertDoesNotThrow(() -> worker.updateModel(worker.getKey(), simpleModelString, true));
 
         String runtimeInfo = worker.getRuntimeInfo(worker.getEngineKeys().iterator().next());
         assertEquals("{\"TimeStamp\":", runtimeInfo.replaceAll("\\s+", "").substring(0, 13));
@@ -379,6 +231,7 @@ public class EngineWorkerTest {
         assertEquals(AxEngineState.READY, worker.getState());
 
         String status = worker.getStatus(worker.getEngineKeys().iterator().next());
+        assertNotNull(status);
         assertEquals("{\"timestamp\":", status.replaceAll("\\s+", "").substring(0, 13));
 
         assertTrue(worker.isStarted());
@@ -386,74 +239,92 @@ public class EngineWorkerTest {
         assertFalse(worker.isStopped());
         assertFalse(worker.isStopped(worker.getEngineKeys().iterator().next()));
 
-        try {
-            worker.start(worker.getEngineKeys().iterator().next());
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("apex engine for engine key Worker:0.0.1 is already running with state READY",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.startAll();
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("apex engine for engine key Worker:0.0.1 is already running with state READY",
-                    apEx.getMessage());
-        }
-
-        try {
-            worker.stop(worker.getEngineKeys().iterator().next());
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.start(worker.getEngineKeys().iterator().next());
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.stop();
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.startAll();
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
+        assertWorkerStartStopWithModel(worker);
+    }
+
+    private static void assertUpdateEngineModel(EngineWorker worker) {
+        assertThatThrownBy(() -> worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), "", true))
+            .hasMessageContaining("failed to unmarshal the apex model on engine DummyKey:0.0.1");
+
+        assertThatThrownBy(
+            () -> worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), "I am not an Apex model", true))
+            .hasMessageContaining("failed to unmarshal the apex model on engine DummyKey:0.0.1");
+
+        assertThatThrownBy(() -> worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), simpleModelString, true))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
+
+        assertThatThrownBy(
+            () -> worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), (AxPolicyModel) null, true))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
+
+        assertThatThrownBy(() -> worker.updateModel(new AxArtifactKey("DummyKey", "0.0.1"), simpleModel, true))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
+    }
+
+    private static void assertEngineWorkerStartStop(EngineWorker worker) {
+        String runtimeInfo = worker.getRuntimeInfo(worker.getEngineKeys().iterator().next());
+        assertEquals("{\"TimeStamp\":", runtimeInfo.replaceAll("\\s+", "").substring(0, 13));
+
+        assertEquals(AxEngineState.STOPPED, worker.getState());
+
+        assertEquals("{\"TimeStamp\":", runtimeInfo.replaceAll("\\s+", "").substring(0, 13));
+
+        assertFalse(worker.isStarted());
+        assertFalse(worker.isStarted(null));
+        assertFalse(worker.isStarted(new AxArtifactKey("DummyKey", "0.0.1")));
+        assertFalse(worker.isStarted(worker.getEngineKeys().iterator().next()));
+        assertTrue(worker.isStopped());
+        assertTrue(worker.isStopped(null));
+        assertTrue(worker.isStopped(new AxArtifactKey("DummyKey", "0.0.1")));
+        assertTrue(worker.isStopped(worker.getEngineKeys().iterator().next()));
+
+        assertThatThrownBy(() -> worker.start(new AxArtifactKey("DummyKey", "0.0.1")))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
+
+        assertThatThrownBy(() -> worker.start(worker.getEngineKeys().iterator().next()))
+            .hasMessageContaining(
+                "start()<-Worker:0.0.1,STOPPED,  cannot start engine, engine has not been initialized, "
+                    + "its model is not loaded");
+
+        assertThatThrownBy(worker::startAll).hasMessageContaining(
+            "start()<-Worker:0.0.1,STOPPED,  cannot start engine, engine has not been initialized, its "
+                + "model is not loaded");
+
+        assertThatThrownBy(() -> worker.stop(new AxArtifactKey("DummyKey", "0.0.1")))
+            .hasMessageContaining("engine key DummyKey:0.0.1 does not match the keyWorker:0.0.1 of this engine");
+
+        assertDoesNotThrow(() -> worker.stop(worker.getEngineKeys().iterator().next()));
+
+        assertDoesNotThrow(() -> worker.stop());
+    }
+
+    private static void assertWorkerStartStopWithModel(EngineWorker worker) throws ApexException {
+        assertThatThrownBy(() -> worker.start(worker.getEngineKeys().iterator().next()))
+            .hasMessageContaining("apex engine for engine key Worker:0.0.1 is already running with state READY");
+
+        assertThatThrownBy(worker::startAll)
+            .hasMessageContaining("apex engine for engine key Worker:0.0.1 is already running with state READY");
+
+        assertDoesNotThrow(() -> worker.stop(worker.getEngineKeys().iterator().next()));
+        assertDoesNotThrow(() -> worker.start(worker.getEngineKeys().iterator().next()));
+        assertDoesNotThrow(() -> worker.stop());
+        assertDoesNotThrow(worker::startAll);
 
         worker.stop();
         worker.startAll();
 
-        try {
-            worker.clear(worker.getEngineKeys().iterator().next());
-            fail("test should throw an exception");
-        } catch (ApexException apEx) {
-            assertEquals("clear()<-Worker:0.0.1,READY, cannot clear engine, engine is not stopped", apEx.getMessage());
-        }
-
-        try {
-            worker.stop(worker.getEngineKeys().iterator().next());
-            worker.clear(worker.getEngineKeys().iterator().next());
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
-
-        try {
-            worker.clear();
-        } catch (ApexException apEx) {
-            fail("test should not throw an exception");
-        }
+        assertThatThrownBy(() -> worker.clear(worker.getEngineKeys().iterator().next()))
+            .hasMessageContaining("clear()<-Worker:0.0.1,READY, cannot clear engine, engine is not stopped");
+
+        assertDoesNotThrow(() -> worker.stop(worker.getEngineKeys().iterator().next()));
+        assertDoesNotThrow(() -> worker.clear(worker.getEngineKeys().iterator().next()));
+        assertDoesNotThrow(() -> worker.clear());
 
         assertNotNull(worker.getApexModelKey());
 
         final ApexPolicyStatisticsManager policyCounter = ApexPolicyStatisticsManager.getInstanceFromRegistry();
         assertNotNull(policyCounter);
         assertEquals(policyCounter.getPolicyExecutedCount(),
-                policyCounter.getPolicyExecutedFailCount() + policyCounter.getPolicyExecutedSuccessCount());
+            policyCounter.getPolicyExecutedFailCount() + policyCounter.getPolicyExecutedSuccessCount());
     }
 }
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/ApexEngineHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/ApexEngineHandler.java
index 2030b3b65..49bde831f 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/ApexEngineHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/ApexEngineHandler.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020-2021 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -74,7 +74,7 @@ public class ApexEngineHandler {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(ApexEngineHandler.class);
 
-    private Map<ToscaConceptIdentifier, ApexMain> apexMainMap = new LinkedHashMap<>();
+    private final Map<ToscaConceptIdentifier, ApexMain> apexMainMap = new LinkedHashMap<>();
 
     /**
      * Constructs the object. Extracts the config and model files from each policy and instantiates the apex engine.
@@ -95,12 +95,13 @@ public class ApexEngineHandler {
      * @param polsToUndeploy list of policies to undeploy which will be modified to remove policies not running
      * @throws ApexStarterException if the apex engine instantiation failed using the policies passed
      */
-    public void updateApexEngine(List<ToscaPolicy> polsToDeploy, List<ToscaConceptIdentifier> polsToUndeploy)
+    public void updateApexEngine(final List<ToscaPolicy> polsToDeploy,
+                                 final List<ToscaConceptIdentifier> polsToUndeploy)
             throws ApexStarterException {
         Set<ToscaConceptIdentifier> runningPolicies = new HashSet<>(getRunningPolicies());
-        List<ToscaPolicy> policiesToDeploy = polsToDeploy;
+        List<ToscaPolicy> policiesToDeploy = new ArrayList<>(polsToDeploy);
         policiesToDeploy.removeIf(p -> runningPolicies.contains(p.getIdentifier()));
-        List<ToscaConceptIdentifier> policiesToUnDeploy = polsToUndeploy;
+        List<ToscaConceptIdentifier> policiesToUnDeploy = new ArrayList<>(polsToUndeploy);
         policiesToUnDeploy.removeIf(p -> !runningPolicies.contains(p));
         Map<ToscaConceptIdentifier, ApexMain> undeployedPoliciesMainMap = new LinkedHashMap<>();
         policiesToUnDeploy.forEach(policyId -> {
@@ -179,19 +180,19 @@ public class ApexEngineHandler {
         List<String> schemaParamKeysToRetain, ApexMain main) {
         ApexParameters existingParameters = ParameterService.get(ApexParameterConstants.MAIN_GROUP_NAME);
         List<String> eventInputParamKeysToRemove = main.getApexParameters().getEventInputParameters().keySet().stream()
-            .filter(key -> !inputParamKeysToRetain.contains(key)).collect(Collectors.toList());
+            .filter(key -> !inputParamKeysToRetain.contains(key)).toList();
         List<String> eventOutputParamKeysToRemove = main.getApexParameters().getEventOutputParameters().keySet()
-            .stream().filter(key -> !outputParamKeysToRetain.contains(key)).collect(Collectors.toList());
+            .stream().filter(key -> !outputParamKeysToRetain.contains(key)).toList();
         eventInputParamKeysToRemove.forEach(existingParameters.getEventInputParameters()::remove);
         eventOutputParamKeysToRemove.forEach(existingParameters.getEventOutputParameters()::remove);
         var engineParameters = main.getApexParameters().getEngineServiceParameters().getEngineParameters();
         final List<TaskParameters> taskParametersToRemove = engineParameters.getTaskParameters().stream()
-            .filter(taskParameter -> !taskParametersToRetain.contains(taskParameter)).collect(Collectors.toList());
+            .filter(taskParameter -> !taskParametersToRetain.contains(taskParameter)).toList();
         final List<String> executorParamKeysToRemove = engineParameters.getExecutorParameterMap().keySet().stream()
-            .filter(key -> !executorParamKeysToRetain.contains(key)).collect(Collectors.toList());
+            .filter(key -> !executorParamKeysToRetain.contains(key)).toList();
         final List<String> schemaParamKeysToRemove =
             engineParameters.getContextParameters().getSchemaParameters().getSchemaHelperParameterMap().keySet()
-                .stream().filter(key -> !schemaParamKeysToRetain.contains(key)).collect(Collectors.toList());
+                .stream().filter(key -> !schemaParamKeysToRetain.contains(key)).toList();
         var aggregatedEngineParameters = existingParameters.getEngineServiceParameters().getEngineParameters();
         aggregatedEngineParameters.getTaskParameters().removeAll(taskParametersToRemove);
         executorParamKeysToRemove.forEach(aggregatedEngineParameters.getExecutorParameterMap()::remove);
@@ -205,17 +206,17 @@ public class ApexEngineHandler {
         Map<AxArtifactKey, AxPolicy> policyMapToRetain, ApexMain main) {
         final AxPolicyModel policyModel = main.getActivator().getPolicyModel();
         final List<AxArtifactKey> keyInfoKeystoRemove = policyModel.getKeyInformation().getKeyInfoMap().keySet()
-            .stream().filter(key -> !keyInfoMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .stream().filter(key -> !keyInfoMapToRetain.containsKey(key)).toList();
         final List<AxArtifactKey> schemaKeystoRemove = policyModel.getSchemas().getSchemasMap().keySet().stream()
-            .filter(key -> !schemaMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .filter(key -> !schemaMapToRetain.containsKey(key)).toList();
         final List<AxArtifactKey> eventKeystoRemove = policyModel.getEvents().getEventMap().keySet().stream()
-            .filter(key -> !eventMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .filter(key -> !eventMapToRetain.containsKey(key)).toList();
         final List<AxArtifactKey> albumKeystoRemove = policyModel.getAlbums().getAlbumsMap().keySet().stream()
-            .filter(key -> !albumMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .filter(key -> !albumMapToRetain.containsKey(key)).toList();
         final List<AxArtifactKey> taskKeystoRemove = policyModel.getTasks().getTaskMap().keySet().stream()
-            .filter(key -> !taskMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .filter(key -> !taskMapToRetain.containsKey(key)).toList();
         final List<AxArtifactKey> policyKeystoRemove = policyModel.getPolicies().getPolicyMap().keySet().stream()
-            .filter(key -> !policyMapToRetain.containsKey(key)).collect(Collectors.toList());
+            .filter(key -> !policyMapToRetain.containsKey(key)).toList();
 
         final Map<AxArtifactKey, AxKeyInfo> keyInfoMap = ModelService.getModel(AxKeyInformation.class).getKeyInfoMap();
         final Map<AxArtifactKey, AxContextSchema> schemasMap =
@@ -274,7 +275,7 @@ public class ApexEngineHandler {
             ModelService.clear();
             ParameterService.clear();
             throw new ApexStarterException("Apex Engine failed to start.");
-        } else if (failedPoliciesMainMap.size() > 0) {
+        } else if (!failedPoliciesMainMap.isEmpty()) {
             updateModelAndParameterServices(failedPoliciesMainMap);
             if (failedPoliciesMainMap.size() == policies.size()) {
                 throw new ApexStarterException("Updating the APEX engine with new policies failed.");
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpMessageHandler.java
index 328bb3003..d3f428174 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpMessageHandler.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  Modifications Copyright (C) 2023 Bell Canada. All rights reserved.
  * ================================================================================
@@ -122,8 +122,8 @@ public class PdpMessageHandler {
      *
      * @return PdpResponseDetails
      */
-    public PdpResponseDetails createPdpResonseDetails(final String requestId, final PdpResponseStatus status,
-            final String responseMessage) {
+    public PdpResponseDetails createPdpResponseDetails(final String requestId, final PdpResponseStatus status,
+                                                       final String responseMessage) {
         final var pdpResponseDetails = new PdpResponseDetails();
         pdpResponseDetails.setResponseTo(requestId);
         pdpResponseDetails.setResponseStatus(status);
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpStateChangeMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpStateChangeMessageHandler.java
index af3e93b6a..4d3de3293 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpStateChangeMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpStateChangeMessageHandler.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  *  Modifications Copyright (C) 2022 Bell Canada. All rights reserved.
  * ================================================================================
@@ -93,13 +93,13 @@ public class PdpStateChangeMessageHandler {
             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
         PdpResponseDetails pdpResponseDetails = null;
         if (pdpStatusContext.getState().equals(PdpState.ACTIVE)) {
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                     PdpResponseStatus.SUCCESS, "Pdp already in active state");
         } else {
             final List<ToscaPolicy> policies = Registry.get(ApexStarterConstants.REG_APEX_TOSCA_POLICY_LIST);
             if (policies.isEmpty()) {
                 pdpStatusContext.setState(PdpState.ACTIVE);
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                         PdpResponseStatus.SUCCESS, "State changed to active. No policies found.");
             } else {
                 pdpResponseDetails = startApexEngine(pdpStateChangeMsg, pdpStatusContext, pdpMessageHandler, policies);
@@ -130,7 +130,7 @@ public class PdpStateChangeMessageHandler {
                 if (new HashSet<>(runningPolicies)
                     .equals(new HashSet<>(pdpMessageHandler.getToscaPolicyIdentifiers(policies)))) {
                     pdpResponseDetails =
-                        pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+                        pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                             PdpResponseStatus.SUCCESS, "Apex engine started. State changed to active.");
                 } else {
                     var message = new StringBuilder(
@@ -139,18 +139,18 @@ public class PdpStateChangeMessageHandler {
                         message.append(policy.getName()).append(":").append(policy.getVersion()).append("  ");
                     }
                     message.append(". Other policies failed execution. Please see the logs for more details.");
-                    pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(
+                    pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(
                         pdpStateChangeMsg.getRequestId(), PdpResponseStatus.SUCCESS, message.toString());
                 }
                 pdpStatusContext.setState(PdpState.ACTIVE);
                 updateDeploymentCounts(runningPolicies, policies);
             } else {
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                     PdpResponseStatus.FAIL, "Apex engine failed to start. State cannot be changed to active.");
             }
         } catch (final ApexStarterException e) {
             LOGGER.error("Pdp State Change failed.", e);
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                     PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
         }
         return pdpResponseDetails;
@@ -168,7 +168,7 @@ public class PdpStateChangeMessageHandler {
             final PdpStatus pdpStatusContext, final PdpMessageHandler pdpMessageHandler) {
         PdpResponseDetails pdpResponseDetails = null;
         if (pdpStatusContext.getState().equals(PdpState.PASSIVE)) {
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                     PdpResponseStatus.SUCCESS, "Pdp already in passive state");
         } else {
             ApexEngineHandler apexEngineHandler = null;
@@ -181,12 +181,12 @@ public class PdpStateChangeMessageHandler {
                 if (null != apexEngineHandler && apexEngineHandler.isApexEngineRunning()) {
                     apexEngineHandler.shutdown();
                 }
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                         PdpResponseStatus.SUCCESS, "Apex pdp state changed from Active to Passive.");
                 pdpStatusContext.setState(PdpState.PASSIVE);
             } catch (final Exception e) {
                 LOGGER.error("Stopping apex engine failed. State cannot be changed to Passive.", e);
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpStateChangeMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpStateChangeMsg.getRequestId(),
                         PdpResponseStatus.FAIL,
                         "Stopping apex engine failed. State cannot be changed to Passive." + e.getMessage());
             }
@@ -206,7 +206,7 @@ public class PdpStateChangeMessageHandler {
             return;
         }
         var policiesToDeploy = policies.stream()
-            .map(ToscaWithTypeAndObjectProperties::getIdentifier).collect(Collectors.toList());
+            .map(ToscaWithTypeAndObjectProperties::getIdentifier).toList();
 
         var policiesSuccessfullyDeployed = new ArrayList<>(policiesToDeploy);
         policiesSuccessfullyDeployed.retainAll(runningPolicies);
diff --git a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpUpdateMessageHandler.java b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpUpdateMessageHandler.java
index b8e361e1e..f6567f06e 100644
--- a/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpUpdateMessageHandler.java
+++ b/services/services-onappf/src/main/java/org/onap/policy/apex/services/onappf/handler/PdpUpdateMessageHandler.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021-2022 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -66,7 +66,7 @@ public class PdpUpdateMessageHandler {
         if (pdpUpdateMsg.appliesTo(pdpStatusContext.getName(), pdpStatusContext.getPdpGroup(),
                 pdpStatusContext.getPdpSubgroup())) {
             if (checkIfAlreadyHandled(pdpUpdateMsg, pdpStatusContext)) {
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                         PdpResponseStatus.SUCCESS, "Pdp already updated");
             } else {
                 pdpResponseDetails = handlePdpUpdate(pdpUpdateMsg, pdpMessageHandler, pdpStatusContext);
@@ -128,7 +128,7 @@ public class PdpUpdateMessageHandler {
             }
         }
         if (null == pdpResponseDetails) {
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                     PdpResponseStatus.SUCCESS, "Pdp update successful.");
         }
         return pdpResponseDetails;
@@ -170,11 +170,11 @@ public class PdpUpdateMessageHandler {
             try {
                 apexEngineHandler.shutdown();
                 runningPolicies = apexEngineHandler.getRunningPolicies();
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                     PdpResponseStatus.SUCCESS, "Pdp update successful. No policies are running.");
             } catch (final ApexStarterException e) {
                 LOGGER.error("Pdp update failed as the policies couldn't be undeployed.", e);
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                         PdpResponseStatus.FAIL, "Pdp update failed as the policies couldn't be undeployed.");
             }
             updateDeploymentCounts(runningPolicies, pdpUpdateMsg);
@@ -200,12 +200,12 @@ public class PdpUpdateMessageHandler {
                     populateResponseForEngineInitiation(pdpUpdateMsg, pdpMessageHandler, apexEngineHandler);
                 runningPolicies = apexEngineHandler.getRunningPolicies();
             } else {
-                pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+                pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                     PdpResponseStatus.FAIL, "Apex engine failed to start.");
             }
         } catch (final ApexStarterException e) {
             LOGGER.error("Apex engine service running failed. ", e);
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                     PdpResponseStatus.FAIL, "Apex engine service running failed. " + e.getMessage());
         }
         updateDeploymentCounts(runningPolicies, pdpUpdateMsg);
@@ -234,7 +234,7 @@ public class PdpUpdateMessageHandler {
                     message.append(policy.getName()).append(":").append(policy.getVersion()).append("  ");
                 }
             }
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                 PdpResponseStatus.SUCCESS, message.toString());
         } else {
             var message =
@@ -243,7 +243,7 @@ public class PdpUpdateMessageHandler {
                 message.append(policy.getName()).append(":").append(policy.getVersion()).append("  ");
             }
             message.append(". Other policies failed execution. Please see the logs for more details.");
-            pdpResponseDetails = pdpMessageHandler.createPdpResonseDetails(pdpUpdateMsg.getRequestId(),
+            pdpResponseDetails = pdpMessageHandler.createPdpResponseDetails(pdpUpdateMsg.getRequestId(),
                 PdpResponseStatus.SUCCESS, message.toString());
         }
         return pdpResponseDetails;
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterActivator.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterActivator.java
index 77ffa5317..793549b14 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterActivator.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterActivator.java
@@ -1,8 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019 Nordix Foundation.
+ *  Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
-
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,15 +22,15 @@
 package org.onap.policy.apex.services.onappf;
 
 import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
 import org.onap.policy.apex.services.onappf.parameters.ApexStarterParameterGroup;
 import org.onap.policy.apex.services.onappf.parameters.ApexStarterParameterHandler;
@@ -44,7 +43,7 @@ import org.onap.policy.models.pdp.concepts.PdpStatus;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestApexStarterActivator {
+class TestApexStarterActivator {
 
     private ApexStarterActivator activator;
 
@@ -53,12 +52,12 @@ public class TestApexStarterActivator {
      *
      * @throws Exception if an error occurs
      */
-    @Before
-    public void setUp() throws Exception {
+    @BeforeEach
+    void setUp() throws Exception {
         Registry.newRegistry();
-        final String[] apexStarterConfigParameters = { "-c", "src/test/resources/ApexStarterConfigParametersNoop.json"};
+        final String[] apexStarterConfigParameters = {"-c", "src/test/resources/ApexStarterConfigParametersNoop.json"};
         final ApexStarterCommandLineArguments arguments =
-                new ApexStarterCommandLineArguments(apexStarterConfigParameters);
+            new ApexStarterCommandLineArguments(apexStarterConfigParameters);
         final ApexStarterParameterGroup parGroup = new ApexStarterParameterHandler().getParameters(arguments);
         activator = new ApexStarterActivator(parGroup);
     }
@@ -68,15 +67,15 @@ public class TestApexStarterActivator {
      *
      * @throws Exception if an error occurs
      */
-    @After
-    public void teardown() throws Exception {
+    @AfterEach
+    void teardown() throws Exception {
         if (activator != null && activator.isAlive()) {
             activator.terminate();
         }
     }
 
     @Test
-    public void testApexStarterActivator() throws ApexStarterException {
+    void testApexStarterActivator() throws ApexStarterException {
         assertFalse(activator.isAlive());
         activator.initialize();
         assertTrue(activator.isAlive());
@@ -93,7 +92,7 @@ public class TestApexStarterActivator {
     }
 
     @Test
-    public void testTerminate() throws Exception {
+    void testTerminate() throws Exception {
         activator.initialize();
         activator.terminate();
         assertFalse(activator.isAlive());
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterCommandLineArguments.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterCommandLineArguments.java
index e564d38e4..c5ebd50ea 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterCommandLineArguments.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterCommandLineArguments.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2021 Nordix Foundation.
+ *  Copyright (C) 2021, 2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,11 +21,11 @@
 package org.onap.policy.apex.services.onappf;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class TestApexStarterCommandLineArguments {
+class TestApexStarterCommandLineArguments {
 
     /**
      * Test method for {@link org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments
@@ -33,7 +33,7 @@ public class TestApexStarterCommandLineArguments {
      * Assert custom option was added to options object from super.
      */
     @Test
-    public void testCommandLineHasPropertyFileOption() {
+    void testCommandLineHasPropertyFileOption() {
         String[] args = {"-p", "someFile.json"};
         ApexStarterCommandLineArguments sut = new ApexStarterCommandLineArguments(args);
         assertEquals("someFile.json", sut.getPropertyFilePath());
@@ -44,7 +44,7 @@ public class TestApexStarterCommandLineArguments {
      * Assert method consults version.txt from Apex module.
      */
     @Test
-    public void testVersion() {
+    void testVersion() {
         String[] args = {"-v"};
         ApexStarterCommandLineArguments sut = new ApexStarterCommandLineArguments(args);
         assertThat(sut.version()).startsWith("ONAP Policy Framework Apex Starter Service");
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterConstants.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterConstants.java
index f1a2a089c..4c13b5709 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterConstants.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterConstants.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019,2023 Nordix Foundation.
+ *  Copyright (C) 2019, 2023-2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Nordix Foundation
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -24,16 +24,17 @@ package org.onap.policy.apex.services.onappf;
 import static org.assertj.core.api.Assertions.assertThatCode;
 
 import java.lang.reflect.Constructor;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 /**
  * Class to perform unit test of {@link ApexStarterConstants}}.
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestApexStarterConstants {
+class TestApexStarterConstants {
+
     @Test
-    public void test() throws Exception {
+    void test() {
         // verify that constructor does not throw an exception
         assertThatCode(() -> {
             Constructor<ApexStarterConstants> c = ApexStarterConstants.class.getDeclaredConstructor();
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterMain.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterMain.java
index f24329c29..e34a1cd04 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterMain.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/TestApexStarterMain.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2020 Nordix Foundation.
+ *  Copyright (C) 2019-2020, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2020 Nordix Foundation
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  * ================================================================================
@@ -24,13 +24,13 @@ package org.onap.policy.apex.services.onappf;
 
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexPolicyStatisticsManager;
 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
 import org.onap.policy.apex.services.onappf.exception.ApexStarterRunTimeException;
@@ -39,18 +39,17 @@ import org.onap.policy.common.utils.resources.MessageConstants;
 import org.onap.policy.common.utils.services.Registry;
 
 /**
- * Class to perform unit test of {@link ApexStarterMain}}.
+ * Class to perform unit test of {@link ApexStarterMain}.
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestApexStarterMain {
-    private ApexStarterMain apexStarter;
+class TestApexStarterMain {
 
     /**
      * Set up.
      */
-    @Before
-    public void setUp() {
+    @BeforeEach
+    void setUp() {
         Registry.newRegistry();
     }
 
@@ -59,8 +58,8 @@ public class TestApexStarterMain {
      *
      * @throws Exception if an error occurs
      */
-    @After
-    public void tearDown() throws Exception {
+    @AfterEach
+    void tearDown() throws Exception {
         // shut down activator
         final ApexStarterActivator activator =
             Registry.getOrDefault(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, ApexStarterActivator.class, null);
@@ -70,9 +69,9 @@ public class TestApexStarterMain {
     }
 
     @Test
-    public void testApexStarter() throws ApexStarterException {
+    void testApexStarter() throws ApexStarterException {
         final String[] apexStarterConfigParameters = {"-c", "src/test/resources/ApexStarterConfigParametersNoop.json"};
-        apexStarter = new ApexStarterMain(apexStarterConfigParameters);
+        ApexStarterMain apexStarter = new ApexStarterMain(apexStarterConfigParameters);
         assertTrue(apexStarter.getParameters().isValid());
         assertEquals(CommonTestData.APEX_STARTER_GROUP_NAME, apexStarter.getParameters().getName());
 
@@ -84,7 +83,7 @@ public class TestApexStarterMain {
     }
 
     @Test
-    public void testApexStarter_NoArguments() {
+    void testApexStarter_NoArguments() {
         final String[] apexStarterConfigParameters = {};
         assertThatThrownBy(() -> new ApexStarterMain(apexStarterConfigParameters))
             .isInstanceOf(ApexStarterRunTimeException.class)
@@ -92,7 +91,7 @@ public class TestApexStarterMain {
     }
 
     @Test
-    public void testApexStarter_InvalidArguments() {
+    void testApexStarter_InvalidArguments() {
         final String[] apexStarterConfigParameters = {"src/test/resources/ApexStarterConfigParameters.json"};
         assertThatThrownBy(() -> new ApexStarterMain(apexStarterConfigParameters))
             .isInstanceOf(ApexStarterRunTimeException.class)
@@ -100,13 +99,13 @@ public class TestApexStarterMain {
     }
 
     @Test
-    public void testApexStarter_Help() {
+    void testApexStarter_Help() {
         final String[] apexStarterConfigParameters = {"-h"};
         assertThatCode(() -> ApexStarterMain.main(apexStarterConfigParameters)).doesNotThrowAnyException();
     }
 
     @Test
-    public void testApexStarter_InvalidParameters() {
+    void testApexStarter_InvalidParameters() {
         final String[] apexStarterConfigParameters =
             {"-c", "src/test/resources/ApexStarterConfigParameters_InvalidName.json"};
         assertThatThrownBy(() -> new ApexStarterMain(apexStarterConfigParameters))
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpStateChangeListener.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpStateChangeListener.java
index dda98db94..7bff64652 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpStateChangeListener.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpStateChangeListener.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
  *  Modifications Copyright (C) 2020-2021 Bell Canada. All rights reserved.
  * ================================================================================
@@ -23,20 +23,19 @@
 package org.onap.policy.apex.services.onappf.comm;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayOutputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintStream;
 import java.util.ArrayList;
 import java.util.List;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexPolicyStatisticsManager;
 import org.onap.policy.apex.services.onappf.ApexStarterActivator;
 import org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments;
@@ -60,25 +59,23 @@ import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestPdpStateChangeListener {
+class TestPdpStateChangeListener {
     private PdpUpdateListener pdpUpdateMessageListener;
     private PdpStateChangeListener pdpStateChangeListener;
     private static final CommInfrastructure INFRA = CommInfrastructure.NOOP;
     private static final String TOPIC = "my-topic";
     private ApexStarterActivator activator;
     private ApexEngineHandler apexEngineHandler;
-    private PrintStream stdout = System.out;
+    private final PrintStream stdout = System.out;
 
     /**
      * Method for setup before each test.
      *
      * @throws ApexStarterException if some error occurs while starting up the apex starter
-     * @throws FileNotFoundException if the file is missing
-     * @throws IOException if IO exception occurs
      * @throws CommandLineException if any parsing of args has errors
      */
-    @Before
-    public void setUp() throws ApexStarterException, FileNotFoundException, IOException, CommandLineException {
+    @BeforeEach
+    void setUp() throws ApexStarterException, CommandLineException {
         pdpUpdateMessageListener = new PdpUpdateListener();
         pdpStateChangeListener = new PdpStateChangeListener();
         Registry.newRegistry();
@@ -108,8 +105,8 @@ public class TestPdpStateChangeListener {
      *
      * @throws Exception if an error occurs
      */
-    @After
-    public void teardown() throws Exception {
+    @AfterEach
+    void teardown() throws Exception {
         System.setOut(stdout);
         apexEngineHandler =
             Registry.getOrDefault(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, ApexEngineHandler.class, null);
@@ -123,7 +120,7 @@ public class TestPdpStateChangeListener {
     }
 
     @Test
-    public void testPdpStateChangeMessageListener_passivetopassive() {
+    void testPdpStateChangeMessageListener_passiveToPassive() {
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null,
             TestListenerUtils.createPdpUpdateMsg(pdpStatus, new ArrayList<>(),
@@ -136,7 +133,7 @@ public class TestPdpStateChangeListener {
     }
 
     @Test
-    public void testPdpStateChangeMessageListener_activetoactive() {
+    void testPdpStateChangeMessageListener_activeToActive() {
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null,
             TestListenerUtils.createPdpUpdateMsg(pdpStatus, new ArrayList<>(),
@@ -150,7 +147,7 @@ public class TestPdpStateChangeListener {
     }
 
     @Test
-    public void testPdpStateChangeMessageListener() throws InterruptedException, CoderException {
+    void testPdpStateChangeMessageListener() throws CoderException {
         OutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
@@ -180,11 +177,11 @@ public class TestPdpStateChangeListener {
         apexEngineHandler =
                 Registry.getOrDefault(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, ApexEngineHandler.class, null);
         assertNotNull(apexEngineHandler);
-        assertTrue(apexEngineHandler.getEngineStats().size() > 0);
+        assertFalse(apexEngineHandler.getEngineStats().isEmpty());
     }
 
     @Test
-    public void testPdpStateChangeMessageListener_activetopassive() throws InterruptedException, CoderException {
+    void testPdpStateChangeMessageListener_activeToPassive() throws CoderException {
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         final ToscaPolicy toscaPolicy =
             TestListenerUtils.createToscaPolicy("apex_policy_name", "1.0", "src/test/resources/dummyProperties.json");
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpUpdateListener.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpUpdateListener.java
index 3716e043f..56889cf72 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpUpdateListener.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/comm/TestPdpUpdateListener.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
  *  Modifications Copyright (C) 2020-2021 Bell Canada. All rights reserved.
  * ================================================================================
@@ -23,21 +23,19 @@
 package org.onap.policy.apex.services.onappf.comm;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.ByteArrayOutputStream;
-import java.io.FileNotFoundException;
-import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintStream;
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.stream.Collectors;
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.service.engine.main.ApexPolicyStatisticsManager;
 import org.onap.policy.apex.services.onappf.ApexStarterActivator;
 import org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments;
@@ -62,25 +60,23 @@ import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestPdpUpdateListener {
+class TestPdpUpdateListener {
     private PdpUpdateListener pdpUpdateMessageListener;
     private PdpStateChangeListener pdpStateChangeListener;
     private static final CommInfrastructure INFRA = CommInfrastructure.NOOP;
     private static final String TOPIC = "my-topic";
     private ApexStarterActivator activator;
     private ApexEngineHandler apexEngineHandler;
-    private PrintStream stdout = System.out;
+    private final PrintStream stdout = System.out;
 
     /**
      * Method for setup before each test.
      *
      * @throws ApexStarterException if some error occurs while starting up the apex starter
-     * @throws FileNotFoundException if the file is missing
-     * @throws IOException if IO exception occurs
      * @throws CommandLineException if any parsing of args has errors
      */
-    @Before
-    public void setUp() throws ApexStarterException, FileNotFoundException, IOException, CommandLineException {
+    @BeforeEach
+    void setUp() throws ApexStarterException, CommandLineException {
         Registry.newRegistry();
         final String[] apexStarterConfigParameters = {"-c", "src/test/resources/ApexStarterConfigParametersNoop.json"};
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
@@ -103,7 +99,7 @@ public class TestPdpUpdateListener {
         pdpUpdateMessageListener = new PdpUpdateListener();
         pdpStateChangeListener = new PdpStateChangeListener();
         Registry.register(ApexPolicyStatisticsManager.REG_APEX_PDP_POLICY_COUNTER,
-                new ApexPolicyStatisticsManager());
+            new ApexPolicyStatisticsManager());
     }
 
     /**
@@ -111,8 +107,8 @@ public class TestPdpUpdateListener {
      *
      * @throws Exception if an error occurs
      */
-    @After
-    public void teardown() throws Exception {
+    @AfterEach
+    void teardown() throws Exception {
         System.setOut(stdout);
         apexEngineHandler =
             Registry.getOrDefault(ApexStarterConstants.REG_APEX_ENGINE_HANDLER, ApexEngineHandler.class, null);
@@ -126,29 +122,29 @@ public class TestPdpUpdateListener {
     }
 
     @Test
-    public void testPdpUpdateMssageListener() throws CoderException {
+    void testPdpUpdateMessageListener() throws CoderException {
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         final ToscaPolicy toscaPolicy =
             TestListenerUtils.createToscaPolicy("apex policy name", "1.0", "src/test/resources/dummyProperties.json");
         final List<ToscaPolicy> toscaPolicies = new ArrayList<ToscaPolicy>();
         toscaPolicies.add(toscaPolicy);
         final PdpUpdate pdpUpdateMsg = TestListenerUtils.createPdpUpdateMsg(pdpStatus, toscaPolicies,
-                new LinkedList<>());
+            new LinkedList<>());
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null, pdpUpdateMsg);
         assertEquals(pdpStatus.getPdpGroup(), pdpUpdateMsg.getPdpGroup());
         assertEquals(pdpStatus.getPdpSubgroup(), pdpUpdateMsg.getPdpSubgroup());
         assertEquals(pdpStatus.getPolicies(),
-                new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPoliciesToBeDeployed()));
+            new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPoliciesToBeDeployed()));
     }
 
     @Test
-    public void testPdpUpdateMssageListener_success() throws InterruptedException, CoderException {
+    void testPdpUpdateMessageListener_success() throws CoderException {
         OutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null,
             TestListenerUtils.createPdpUpdateMsg(pdpStatus, new ArrayList<>(),
-                    new ArrayList<>()));
+                new ArrayList<>()));
         PdpStateChange pdpStateChangeMsg =
             TestListenerUtils.createPdpStateChangeMsg(PdpState.ACTIVE, "pdpGroup", "pdpSubgroup", pdpStatus.getName());
         pdpStateChangeListener.onTopicEvent(INFRA, TOPIC, null, pdpStateChangeMsg);
@@ -157,22 +153,22 @@ public class TestPdpUpdateListener {
         final List<ToscaPolicy> toscaPolicies = new ArrayList<ToscaPolicy>();
         toscaPolicies.add(toscaPolicy);
         final PdpUpdate pdpUpdateMsg = TestListenerUtils.createPdpUpdateMsg(pdpStatus, toscaPolicies,
-                new LinkedList<>());
+            new LinkedList<>());
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null, pdpUpdateMsg);
         final String outString = outContent.toString();
         assertEquals(pdpStatus.getPdpGroup(), pdpUpdateMsg.getPdpGroup());
         assertEquals(pdpStatus.getPdpSubgroup(), pdpUpdateMsg.getPdpSubgroup());
         assertEquals(pdpStatus.getPolicies(),
-                new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPoliciesToBeDeployed()));
+            new PdpMessageHandler().getToscaPolicyIdentifiers(pdpUpdateMsg.getPoliciesToBeDeployed()));
         assertThat(outString).contains("Apex engine started. Deployed policies are: apex_policy_name:1.0");
     }
 
     @Test
-    public void testPdpUpdateMssageListener_undeploy() throws InterruptedException, CoderException {
+    void testPdpUpdateMessageListener_undeploy() throws CoderException {
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null,
             TestListenerUtils.createPdpUpdateMsg(pdpStatus, new ArrayList<>(),
-                    new ArrayList<>()));
+                new ArrayList<>()));
         PdpStateChange pdpStateChangeMsg =
             TestListenerUtils.createPdpStateChangeMsg(PdpState.ACTIVE, "pdpGroup", "pdpSubgroup", pdpStatus.getName());
         pdpStateChangeListener.onTopicEvent(INFRA, TOPIC, null, pdpStateChangeMsg);
@@ -181,21 +177,20 @@ public class TestPdpUpdateListener {
         final List<ToscaPolicy> toscaPolicies = new ArrayList<ToscaPolicy>();
         toscaPolicies.add(toscaPolicy);
         final PdpUpdate pdpUpdateMsg = TestListenerUtils.createPdpUpdateMsg(pdpStatus, toscaPolicies,
-                new ArrayList<>());
+            new ArrayList<>());
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null, pdpUpdateMsg);
         OutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null,
             TestListenerUtils.createPdpUpdateMsg(pdpStatus, new ArrayList<>(),
-                    toscaPolicies.stream().map(ToscaPolicy::getIdentifier)
+                toscaPolicies.stream().map(ToscaPolicy::getIdentifier)
                     .collect(Collectors.toList())));
         final String outString = outContent.toString();
         assertThat(outString).contains("Pdp update successful. No policies are running.");
     }
 
     @Test
-    public void testPdpUpdateMssageListener_multi_policy_duplicate()
-        throws InterruptedException, ApexStarterException, CoderException {
+    void testPdpUpdateMessageListener_multi_policy_duplicate() throws CoderException {
         OutputStream outContent = new ByteArrayOutputStream();
         System.setOut(new PrintStream(outContent));
         final PdpStatus pdpStatus = Registry.get(ApexStarterConstants.REG_PDP_STATUS_OBJECT);
@@ -207,7 +202,7 @@ public class TestPdpUpdateListener {
         toscaPolicies.add(toscaPolicy);
         toscaPolicies.add(toscaPolicy2);
         final PdpUpdate pdpUpdateMsg = TestListenerUtils.createPdpUpdateMsg(pdpStatus, toscaPolicies,
-                new LinkedList<>());
+            new LinkedList<>());
         pdpUpdateMessageListener.onTopicEvent(INFRA, TOPIC, null, pdpUpdateMsg);
         PdpStateChange pdpStateChangeMsg =
             TestListenerUtils.createPdpStateChangeMsg(PdpState.ACTIVE, "pdpGroup", "pdpSubgroup", pdpStatus.getName());
@@ -215,6 +210,6 @@ public class TestPdpUpdateListener {
         final String outString = outContent.toString();
         assertTrue(outString.contains(
             "Apex engine started. But, only the following polices are running - apex_policy_name:1.0  . "
-            + "Other policies failed execution. Please see the logs for more details."));
+                + "Other policies failed execution. Please see the logs for more details."));
     }
 }
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/exception/TestExceptions.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/exception/TestExceptions.java
index 7ccb850b1..da1568d33 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/exception/TestExceptions.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/exception/TestExceptions.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019 Nordix Foundation.
+ *  Copyright (C) 2019, 2024 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@
 
 package org.onap.policy.apex.services.onappf.exception;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.utils.test.ExceptionsTester;
 
 /**
@@ -28,10 +28,10 @@ import org.onap.policy.common.utils.test.ExceptionsTester;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestExceptions {
+class TestExceptions {
 
     @Test
-    public void test() {
+    void test() {
         new ExceptionsTester().test(ApexStarterException.class);
         new ExceptionsTester().test(ApexStarterRunTimeException.class);
     }
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/CommonTestData.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/CommonTestData.java
index f227acc6c..099663af9 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/CommonTestData.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/CommonTestData.java
@@ -86,7 +86,7 @@ public class CommonTestData {
      * Converts the contents of a map to a parameter class.
      *
      * @param source property map
-     * @param clazz class of object to be created from the map
+     * @param clazz  class of object to be created from the map
      * @return a new object represented by the map
      */
     public <T extends ParameterGroup> T toObject(final Map<String, Object> source, final Class<T> clazz) {
@@ -102,7 +102,6 @@ public class CommonTestData {
      * Returns a property map for a ApexStarterParameterGroup map for test cases.
      *
      * @param name name of the parameters
-     *
      * @return a property map suitable for constructing an object
      */
     public Map<String, Object> getApexStarterParameterGroupMap(final String name) {
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterGroup.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterGroup.java
index c44964921..bd063d06a 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterGroup.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterGroup.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019 Nordix Foundation.
+ *  Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,12 +22,13 @@
 package org.onap.policy.apex.services.onappf.parameters;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.Map;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.endpoints.parameters.RestServerParameters;
 import org.onap.policy.common.endpoints.parameters.TopicParameterGroup;
 import org.onap.policy.common.parameters.ValidationResult;
@@ -37,23 +38,23 @@ import org.onap.policy.common.parameters.ValidationResult;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestApexStarterParameterGroup {
+class TestApexStarterParameterGroup {
     CommonTestData commonTestData = new CommonTestData();
 
     @Test
-    public void testApexStarterParameterGroup_Named() {
+    void testApexStarterParameterGroup_Named() {
         final ApexStarterParameterGroup apexStarterParameters = new ApexStarterParameterGroup("my-name");
         assertEquals("my-name", apexStarterParameters.getName());
     }
 
     @Test
-    public void testApexStarterParameterGroup() {
+    void testApexStarterParameterGroup() {
         final ApexStarterParameterGroup apexStarterParameters = commonTestData.toObject(
-                commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME),
-                ApexStarterParameterGroup.class);
+            commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME),
+            ApexStarterParameterGroup.class);
         final RestServerParameters restServerParameters = apexStarterParameters.getRestServerParameters();
         final PdpStatusParameters pdpStatusParameters = apexStarterParameters.getPdpStatusParameters();
-        final TopicParameterGroup topicParameterGroup  = apexStarterParameters.getTopicParameterGroup();
+        final TopicParameterGroup topicParameterGroup = apexStarterParameters.getTopicParameterGroup();
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertTrue(validationResult.isValid());
         assertEquals(CommonTestData.APEX_STARTER_GROUP_NAME, apexStarterParameters.getName());
@@ -72,19 +73,19 @@ public class TestApexStarterParameterGroup {
     }
 
     @Test
-    public void testApexStarterParameterGroup_NullName() {
+    void testApexStarterParameterGroup_NullName() {
         final ApexStarterParameterGroup apexStarterParameters = commonTestData
-                .toObject(commonTestData.getApexStarterParameterGroupMap(null), ApexStarterParameterGroup.class);
+            .toObject(commonTestData.getApexStarterParameterGroupMap(null), ApexStarterParameterGroup.class);
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertFalse(validationResult.isValid());
-        assertEquals(null, apexStarterParameters.getName());
+        assertNull(apexStarterParameters.getName());
         assertTrue(validationResult.getResult().contains("is null"));
     }
 
     @Test
-    public void testApexStarterParameterGroup_EmptyName() {
+    void testApexStarterParameterGroup_EmptyName() {
         final ApexStarterParameterGroup apexStarterParameters = commonTestData
-                .toObject(commonTestData.getApexStarterParameterGroupMap(""), ApexStarterParameterGroup.class);
+            .toObject(commonTestData.getApexStarterParameterGroupMap(""), ApexStarterParameterGroup.class);
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertThat(validationResult.getResult()).contains("\"name\" value \"\" INVALID, is blank");
         assertFalse(validationResult.isValid());
@@ -92,10 +93,10 @@ public class TestApexStarterParameterGroup {
     }
 
     @Test
-    public void testApexStarterParameterGroup_SetName() {
+    void testApexStarterParameterGroup_SetName() {
         final ApexStarterParameterGroup apexStarterParameters = commonTestData.toObject(
-                commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME),
-                ApexStarterParameterGroup.class);
+            commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME),
+            ApexStarterParameterGroup.class);
         apexStarterParameters.setName("ApexStarterNewGroup");
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertTrue(validationResult.isValid());
@@ -103,26 +104,26 @@ public class TestApexStarterParameterGroup {
     }
 
     @Test
-    public void testApexStarterParameterGroup_EmptyPdpStatusParameters() {
+    void testApexStarterParameterGroup_EmptyPdpStatusParameters() {
         final Map<String, Object> map =
-                commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
+            commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
         map.put("pdpStatusParameters", commonTestData.getPdpStatusParametersMap(true));
         final ApexStarterParameterGroup apexStarterParameters =
-                commonTestData.toObject(map, ApexStarterParameterGroup.class);
+            commonTestData.toObject(map, ApexStarterParameterGroup.class);
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertThat(validationResult.getResult())
-                .contains("\"ApexStarterParameterGroup\" INVALID, item has status INVALID");
+            .contains("\"ApexStarterParameterGroup\" INVALID, item has status INVALID");
         assertFalse(validationResult.isValid());
     }
 
     @Test
-    public void testApexStarterParameterGroupp_EmptyRestServerParameters() {
+    void testApexStarterParameterGroupp_EmptyRestServerParameters() {
         final Map<String, Object> map =
-                commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
+            commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
         map.put("restServerParameters", commonTestData.getRestServerParametersMap(true));
 
         final ApexStarterParameterGroup apexStarterParameters =
-                commonTestData.toObject(map, ApexStarterParameterGroup.class);
+            commonTestData.toObject(map, ApexStarterParameterGroup.class);
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertThat(validationResult.getResult()).contains("\"RestServerParameters\" INVALID, item has status INVALID");
         assertFalse(validationResult.isValid());
@@ -130,13 +131,13 @@ public class TestApexStarterParameterGroup {
 
 
     @Test
-    public void testApexStarterParameterGroupp_EmptyTopicParameters() {
+    void testApexStarterParameterGroup_EmptyTopicParameters() {
         final Map<String, Object> map =
-                commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
+            commonTestData.getApexStarterParameterGroupMap(CommonTestData.APEX_STARTER_GROUP_NAME);
         map.put("topicParameterGroup", commonTestData.getTopicParametersMap(true));
 
         final ApexStarterParameterGroup apexStarterParameters =
-                commonTestData.toObject(map, ApexStarterParameterGroup.class);
+            commonTestData.toObject(map, ApexStarterParameterGroup.class);
         final ValidationResult validationResult = apexStarterParameters.validate();
         assertThat(validationResult.getResult()).contains("\"TopicParameterGroup\" INVALID, item has status INVALID");
         assertFalse(validationResult.isValid());
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterHandler.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterHandler.java
index 90c2ef743..0f97203b4 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterHandler.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestApexStarterParameterHandler.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019-2021 Nordix Foundation.
+ *  Copyright (C) 2019-2021, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,11 +22,11 @@
 package org.onap.policy.apex.services.onappf.parameters;
 
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.FileNotFoundException;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments;
 import org.onap.policy.apex.services.onappf.exception.ApexStarterException;
 import org.onap.policy.common.utils.cmd.CommandLineException;
@@ -37,11 +37,11 @@ import org.onap.policy.common.utils.coder.CoderException;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestApexStarterParameterHandler {
+class TestApexStarterParameterHandler {
 
     @Test
-    public void testParameterHandlerNoParameterFile() throws ApexStarterException, CommandLineException {
-        final String[] emptyArgumentString = { "-c", "src/test/resources/NoParametersFile.json" };
+    void testParameterHandlerNoParameterFile() throws CommandLineException {
+        final String[] emptyArgumentString = {"-c", "src/test/resources/NoParametersFile.json"};
 
         final ApexStarterCommandLineArguments emptyArguments = new ApexStarterCommandLineArguments();
         emptyArguments.parse(emptyArgumentString);
@@ -52,8 +52,8 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testParameterHandlerEmptyParameters() throws ApexStarterException, CommandLineException {
-        final String[] noArgumentString = { "-c", "src/test/resources/NoParameters.json" };
+    void testParameterHandlerEmptyParameters() throws CommandLineException {
+        final String[] noArgumentString = {"-c", "src/test/resources/NoParameters.json"};
 
         final ApexStarterCommandLineArguments noArguments = new ApexStarterCommandLineArguments();
         noArguments.parse(noArgumentString);
@@ -63,8 +63,8 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testParameterHandlerInvalidParameters() throws ApexStarterException, CommandLineException {
-        final String[] invalidArgumentString = { "-c", "src/test/resources/InvalidParameters.json" };
+    void testParameterHandlerInvalidParameters() throws CommandLineException {
+        final String[] invalidArgumentString = {"-c", "src/test/resources/InvalidParameters.json"};
 
         final ApexStarterCommandLineArguments invalidArguments = new ApexStarterCommandLineArguments();
         invalidArguments.parse(invalidArgumentString);
@@ -75,8 +75,8 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testParameterHandlerNoParameters() throws ApexStarterException, CommandLineException {
-        final String[] noArgumentString = { "-c", "src/test/resources/EmptyConfigParameters.json" };
+    void testParameterHandlerNoParameters() throws CommandLineException {
+        final String[] noArgumentString = {"-c", "src/test/resources/EmptyConfigParameters.json"};
 
         final ApexStarterCommandLineArguments noArguments = new ApexStarterCommandLineArguments();
         noArguments.parse(noArgumentString);
@@ -86,8 +86,8 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testApexStarterParameterGroup() throws ApexStarterException, CommandLineException {
-        final String[] apexStarterConfigParameters = { "-c", "src/test/resources/ApexStarterConfigParameters.json" };
+    void testApexStarterParameterGroup() throws ApexStarterException, CommandLineException {
+        final String[] apexStarterConfigParameters = {"-c", "src/test/resources/ApexStarterConfigParameters.json"};
 
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
         arguments.parse(apexStarterConfigParameters);
@@ -98,9 +98,9 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testApexStarterParameterGroup_InvalidName() throws ApexStarterException, CommandLineException {
+    void testApexStarterParameterGroup_InvalidName() throws CommandLineException {
         final String[] apexStarterConfigParameters =
-        { "-c", "src/test/resources/ApexStarterConfigParameters_InvalidName.json" };
+            {"-c", "src/test/resources/ApexStarterConfigParameters_InvalidName.json"};
 
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
         arguments.parse(apexStarterConfigParameters);
@@ -110,24 +110,24 @@ public class TestApexStarterParameterHandler {
     }
 
     @Test
-    public void testApexStarterVersion() throws ApexStarterException, CommandLineException {
-        final String[] apexStarterConfigParameters = { "-v" };
+    void testApexStarterVersion() throws CommandLineException {
+        final String[] apexStarterConfigParameters = {"-v"};
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
         final String version = arguments.parse(apexStarterConfigParameters);
         assertTrue(version.startsWith("ONAP Policy Framework Apex Starter Service"));
     }
 
     @Test
-    public void testApexStarterHelp() throws ApexStarterException, CommandLineException {
-        final String[] apexStarterConfigParameters = { "-h" };
+    void testApexStarterHelp() throws CommandLineException {
+        final String[] apexStarterConfigParameters = {"-h"};
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
         final String help = arguments.parse(apexStarterConfigParameters);
         assertTrue(help.startsWith("usage:"));
     }
 
     @Test
-    public void testApexStarterInvalidOption() throws ApexStarterException {
-        final String[] apexStarterConfigParameters = { "-d" };
+    void testApexStarterInvalidOption() {
+        final String[] apexStarterConfigParameters = {"-d"};
         final ApexStarterCommandLineArguments arguments = new ApexStarterCommandLineArguments();
         assertThatThrownBy(() -> arguments.parse(apexStarterConfigParameters))
             .hasMessageStartingWith("invalid command line arguments specified");
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestPdpStatusParameters.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestPdpStatusParameters.java
index 765bb70a9..7b65ac71e 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestPdpStatusParameters.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/TestPdpStatusParameters.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019 Nordix Foundation.
+ *  Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,13 +22,13 @@
 package org.onap.policy.apex.services.onappf.parameters;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.Map;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.parameters.ValidationResult;
 
 /**
@@ -36,13 +36,13 @@ import org.onap.policy.common.parameters.ValidationResult;
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestPdpStatusParameters {
-    private static CommonTestData testData = new CommonTestData();
+class TestPdpStatusParameters {
+    private static final CommonTestData testData = new CommonTestData();
 
     @Test
-    public void test() throws Exception {
+    void test() {
         final PdpStatusParameters pdpStatusParameters =
-                testData.toObject(testData.getPdpStatusParametersMap(false), PdpStatusParameters.class);
+            testData.toObject(testData.getPdpStatusParametersMap(false), PdpStatusParameters.class);
         final ValidationResult validationResult = pdpStatusParameters.validate();
         assertTrue(validationResult.isValid());
         assertEquals(CommonTestData.TIME_INTERVAL, pdpStatusParameters.getTimeIntervalMs());
@@ -53,31 +53,31 @@ public class TestPdpStatusParameters {
     }
 
     @Test
-    public void testValidate() throws Exception {
+    void testValidate() {
         final PdpStatusParameters pdpStatusParameters =
-                testData.toObject(testData.getPdpStatusParametersMap(false), PdpStatusParameters.class);
+            testData.toObject(testData.getPdpStatusParametersMap(false), PdpStatusParameters.class);
         final ValidationResult result = pdpStatusParameters.validate();
         assertNull(result.getResult());
         assertTrue(result.isValid());
     }
 
     @Test
-    public void testPdpStatusParameters_nullPdpGroup() throws Exception {
+    void testPdpStatusParameters_nullPdpGroup() {
         Map<String, Object> pdpStatusParametersMap = testData.getPdpStatusParametersMap(false);
         pdpStatusParametersMap.remove("pdpGroup");
         final PdpStatusParameters pdpStatusParameters =
-                testData.toObject(pdpStatusParametersMap, PdpStatusParameters.class);
+            testData.toObject(pdpStatusParametersMap, PdpStatusParameters.class);
         final ValidationResult validationResult = pdpStatusParameters.validate();
         assertFalse(validationResult.isValid());
         assertThat(validationResult.getResult()).contains("\"pdpGroup\" value \"null\" INVALID");
     }
 
     @Test
-    public void testPdpStatusParameters_emptyPdpGroup() throws Exception {
+    void testPdpStatusParameters_emptyPdpGroup() {
         Map<String, Object> pdpStatusParametersMap = testData.getPdpStatusParametersMap(false);
         pdpStatusParametersMap.put("pdpGroup", "");
         final PdpStatusParameters pdpStatusParameters =
-                testData.toObject(pdpStatusParametersMap, PdpStatusParameters.class);
+            testData.toObject(pdpStatusParametersMap, PdpStatusParameters.class);
         final ValidationResult validationResult = pdpStatusParameters.validate();
         assertFalse(validationResult.isValid());
         assertThat(validationResult.getResult()).contains("\"pdpGroup\" value \"\" INVALID");
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyStateFinalizerExecutor.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyStateFinalizerExecutor.java
index 2342542e4..b89333668 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyStateFinalizerExecutor.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyStateFinalizerExecutor.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019 Nordix Foundation.
+ *  Modifications Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -24,9 +24,7 @@ package org.onap.policy.apex.services.onappf.parameters.dummyclasses;
 
 import java.util.Map;
 import java.util.Properties;
-import org.onap.policy.apex.context.ContextException;
 import org.onap.policy.apex.core.engine.executor.StateFinalizerExecutor;
-import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
 
 /**
  * Dummy state finalizer executor for testing.
@@ -35,7 +33,7 @@ public class DummyStateFinalizerExecutor extends StateFinalizerExecutor {
 
     @Override
     public String execute(final long executionId, final Properties executorProperties,
-            final Map<String, Object> newIncomingFields) throws StateMachineException, ContextException {
+                          final Map<String, Object> newIncomingFields) {
 
         return "stateOutput0";
     }
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskExecutor.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskExecutor.java
index eac2ec3ba..85999d74c 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskExecutor.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskExecutor.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019 Nordix Foundation.
+ *  Modifications Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
@@ -25,10 +25,8 @@ package org.onap.policy.apex.services.onappf.parameters.dummyclasses;
 
 import java.util.Map;
 import java.util.Properties;
-import org.onap.policy.apex.context.ContextException;
 import org.onap.policy.apex.core.engine.event.EnEvent;
 import org.onap.policy.apex.core.engine.executor.TaskExecutor;
-import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
 import org.onap.policy.apex.model.policymodel.concepts.AxTask;
 
@@ -38,13 +36,13 @@ import org.onap.policy.apex.model.policymodel.concepts.AxTask;
 public class DummyTaskExecutor extends TaskExecutor {
 
     @Override
-    public void prepare() throws StateMachineException {
+    public void prepare() {
         // Not used
     }
 
     @Override
     public Map<String, Map<String, Object>> execute(final long executionId, final Properties executorProperties,
-            final Map<String, Object> newIncomingFields) throws StateMachineException, ContextException {
+                                                    final Map<String, Object> newIncomingFields) {
 
         AxArtifactKey event0Key = new AxArtifactKey("Event0:0.0.1");
         return Map.of(event0Key.getName(), new EnEvent(event0Key));
@@ -57,7 +55,7 @@ public class DummyTaskExecutor extends TaskExecutor {
     }
 
     @Override
-    public void cleanUp() throws StateMachineException {
+    public void cleanUp() {
         // Not used
     }
 }
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskSelectExecutor.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskSelectExecutor.java
index 5a6a98f4e..d51f2c4b0 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskSelectExecutor.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/parameters/dummyclasses/DummyTaskSelectExecutor.java
@@ -1,7 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
- *  Modifications Copyright (C) 2019 Nordix Foundation.
+ *  Modifications Copyright (C) 2019, 2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -23,10 +23,8 @@
 package org.onap.policy.apex.services.onappf.parameters.dummyclasses;
 
 import java.util.Properties;
-import org.onap.policy.apex.context.ContextException;
 import org.onap.policy.apex.core.engine.event.EnEvent;
 import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor;
-import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
 
 /**
@@ -35,19 +33,19 @@ import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
 public class DummyTaskSelectExecutor extends TaskSelectExecutor {
 
     @Override
-    public void prepare() throws StateMachineException {
+    public void prepare() {
         // Not used
     }
 
     @Override
     public AxArtifactKey execute(final long executionId, final Properties executorProperties,
-            final EnEvent newIncomingEvent) throws StateMachineException, ContextException {
+                                 final EnEvent newIncomingEvent) {
 
         return new AxArtifactKey("task:0.0.1");
     }
 
     @Override
-    public void cleanUp() throws StateMachineException {
+    public void cleanUp() {
         // Not used
     }
 }
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/CommonApexStarterRestServer.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/CommonApexStarterRestServer.java
index 24835d70c..3279c27ab 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/CommonApexStarterRestServer.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/CommonApexStarterRestServer.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019,2023 Nordix Foundation.
+ *  Copyright (C) 2019, 2023-2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -21,8 +21,9 @@
 
 package org.onap.policy.apex.services.onappf.rest;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import jakarta.ws.rs.client.Client;
 import jakarta.ws.rs.client.ClientBuilder;
@@ -39,10 +40,10 @@ import java.util.function.Function;
 import javax.net.ssl.SSLContext;
 import org.glassfish.jersey.client.ClientProperties;
 import org.glassfish.jersey.client.authentication.HttpAuthenticationFeature;
-import org.junit.After;
-import org.junit.AfterClass;
-import org.junit.Before;
-import org.junit.BeforeClass;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
 import org.onap.policy.apex.services.onappf.ApexStarterActivator;
 import org.onap.policy.apex.services.onappf.ApexStarterConstants;
 import org.onap.policy.apex.services.onappf.ApexStarterMain;
@@ -59,7 +60,7 @@ import org.slf4j.LoggerFactory;
 import org.springframework.test.util.ReflectionTestUtils;
 
 /**
- * Class to perform unit test of {@link ApexStarterRestServer}.
+ * Class to perform unit test to check REST endpoints.
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
@@ -67,9 +68,8 @@ public class CommonApexStarterRestServer {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(CommonApexStarterRestServer.class);
 
-    private static Coder coder = new StandardCoder();
+    private static final Coder coder = new StandardCoder();
 
-    public static final String NOT_ALIVE = "not alive";
     public static final String ALIVE = "alive";
     public static final String SELF = "self";
     public static final String ENDPOINT_PREFIX = "policy/apex-pdp/v1/";
@@ -86,7 +86,7 @@ public class CommonApexStarterRestServer {
      *
      * @throws Exception if an error occurs
      */
-    @BeforeClass
+    @BeforeAll
     public static void setUpBeforeClass() throws Exception {
         port = NetworkUtil.allocPort();
 
@@ -100,7 +100,7 @@ public class CommonApexStarterRestServer {
     /**
      * Stops Main.
      */
-    @AfterClass
+    @AfterAll
     public static void teardownAfterClass() {
         try {
             stopMain();
@@ -115,7 +115,7 @@ public class CommonApexStarterRestServer {
      *
      * @throws Exception if an error occurs
      */
-    @Before
+    @BeforeEach
     public void setUp() throws Exception {
         // restart, if not currently running
         if (main == null) {
@@ -123,13 +123,13 @@ public class CommonApexStarterRestServer {
         }
 
         activatorWasAlive =
-                Registry.get(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, ApexStarterActivator.class).isAlive();
+            Registry.get(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, ApexStarterActivator.class).isAlive();
     }
 
     /**
      * Restores the activator's "alive" state.
      */
-    @After
+    @AfterEach
     public void tearDown() {
         markActivator(activatorWasAlive);
     }
@@ -154,10 +154,10 @@ public class CommonApexStarterRestServer {
      */
     private static void makeConfigFile() throws Exception {
         final Map<String, Object> config =
-                new CommonTestData().getApexStarterParameterGroupMap("ApexStarterParameterGroup");
+            new CommonTestData().getApexStarterParameterGroupMap("ApexStarterParameterGroup");
 
-        @SuppressWarnings("unchecked")
-        final Map<String, Object> restParams = (Map<String, Object>) config.get("restServerParameters");
+        @SuppressWarnings("unchecked") final Map<String, Object> restParams =
+            (Map<String, Object>) config.get("restServerParameters");
         restParams.put("port", port);
 
         final File file = new File("src/test/resources/TestConfigParams.json");
@@ -184,7 +184,7 @@ public class CommonApexStarterRestServer {
         systemProps.put("javax.net.ssl.keyStorePassword", SelfSignedKeyStore.KEYSTORE_PASSWORD);
         System.setProperties(systemProps);
 
-        final String[] apexStarterConfigParameters = { "-c", "src/test/resources/TestConfigParams.json" };
+        final String[] apexStarterConfigParameters = {"-c", "src/test/resources/TestConfigParams.json"};
 
         main = new ApexStarterMain(apexStarterConfigParameters);
 
@@ -196,7 +196,7 @@ public class CommonApexStarterRestServer {
     /**
      * Stops the "Main".
      *
-     * @throws Exception if an error occurs
+     * @throws ApexStarterException if an error occurs
      */
     private static void stopMain() throws ApexStarterException {
         if (main != null) {
@@ -209,8 +209,10 @@ public class CommonApexStarterRestServer {
 
     private void markActivator(final boolean wasAlive) {
         final Object manager = ReflectionTestUtils.getField(
-                Registry.get(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, ApexStarterActivator.class), "manager");
+            Registry.get(ApexStarterConstants.REG_APEX_STARTER_ACTIVATOR, ApexStarterActivator.class), "manager");
+        assertNotNull(manager);
         AtomicBoolean running = (AtomicBoolean) ReflectionTestUtils.getField(manager, "running");
+        assertNotNull(running);
         running.set(wasAlive);
     }
 
@@ -218,13 +220,13 @@ public class CommonApexStarterRestServer {
      * Verifies that unauthorized requests fail.
      *
      * @param endpoint the target end point
-     * @param sender function that sends the requests to the target
+     * @param sender   function that sends the requests to the target
      * @throws Exception if an error occurs
      */
-    protected void checkUnauthRequest(final String endpoint, final Function<Invocation.Builder, Response> sender)
-            throws Exception {
+    protected void checkUnauthorizedRequest(final String endpoint, final Function<Invocation.Builder, Response> sender)
+        throws Exception {
         assertEquals(Response.Status.UNAUTHORIZED.getStatusCode(),
-                sender.apply(sendNoAuthRequest(endpoint)).getStatus());
+            sender.apply(sendNoAuthRequest(endpoint)).getStatus());
     }
 
     /**
@@ -253,16 +255,16 @@ public class CommonApexStarterRestServer {
      * Sends a request to a fully qualified endpoint.
      *
      * @param fullyQualifiedEndpoint the fully qualified target endpoint
-     * @param includeAuth if authorization header should be included
+     * @param includeAuth            if authorization header should be included
      * @return a request builder
      * @throws Exception if an error occurs
      */
     protected Invocation.Builder sendFqeRequest(final String fullyQualifiedEndpoint, final boolean includeAuth)
-            throws Exception {
+        throws Exception {
         final SSLContext sc = SSLContext.getInstance("TLSv1.2");
         sc.init(null, NetworkUtil.getAlwaysTrustingManager(), new SecureRandom());
         final ClientBuilder clientBuilder =
-                ClientBuilder.newBuilder().sslContext(sc).hostnameVerifier((host, session) -> true);
+            ClientBuilder.newBuilder().sslContext(sc).hostnameVerifier((host, session) -> true);
         final Client client = clientBuilder.build();
 
         client.property(ClientProperties.METAINF_SERVICES_LOOKUP_DISABLE, "true");
diff --git a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/TestHealthCheckRestControllerV1.java b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/TestHealthCheckRestControllerV1.java
index a49fb5070..a63824a0e 100644
--- a/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/TestHealthCheckRestControllerV1.java
+++ b/services/services-onappf/src/test/java/org/onap/policy/apex/services/onappf/rest/TestHealthCheckRestControllerV1.java
@@ -1,6 +1,6 @@
 /*-
  * ============LICENSE_START=======================================================
- *  Copyright (C) 2019, 2023 Nordix Foundation.
+ *  Copyright (C) 2019, 2023-2024 Nordix Foundation.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -22,44 +22,39 @@
 package org.onap.policy.apex.services.onappf.rest;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import jakarta.ws.rs.client.Invocation;
-import org.junit.Ignore;
-import org.junit.Test;
+import jakarta.ws.rs.client.SyncInvoker;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
 import org.onap.policy.common.endpoints.report.HealthCheckReport;
 
 /**
- * Class to perform unit test of {@link ApexStarterRestServer}.
+ * Class to perform unit test of {@link HealthCheckRestControllerV1}.
  *
  * @author Ajith Sreekumar (ajith.sreekumar@est.tech)
  */
-public class TestHealthCheckRestControllerV1 extends CommonApexStarterRestServer {
+class TestHealthCheckRestControllerV1 extends CommonApexStarterRestServer {
 
     private static final String HEALTHCHECK_ENDPOINT = "healthcheck";
 
-    @Ignore
     @Test
-    public void testSwagger() throws Exception {
-        super.testSwagger(HEALTHCHECK_ENDPOINT);
-    }
-
-    @Test
-    public void testHealthCheckSuccess() throws Exception {
+    void testHealthCheckSuccess() throws Exception {
         final Invocation.Builder invocationBuilder = sendRequest(HEALTHCHECK_ENDPOINT);
         final HealthCheckReport report = invocationBuilder.get(HealthCheckReport.class);
-        validateHealthCheckReport(SELF, true, 200, ALIVE, report);
+        validateHealthCheckReport(report);
 
         // verify it fails when no authorization info is included
-        checkUnauthRequest(HEALTHCHECK_ENDPOINT, req -> req.get());
+        checkUnauthorizedRequest(HEALTHCHECK_ENDPOINT, SyncInvoker::get);
     }
 
-    private void validateHealthCheckReport(final String url, final boolean healthy, final int code,
-            final String message, final HealthCheckReport report) {
+    private void validateHealthCheckReport(final HealthCheckReport report) {
         assertThat(report.getName()).isNotBlank();
-        assertEquals(url, report.getUrl());
-        assertEquals(healthy, report.isHealthy());
-        assertEquals(code, report.getCode());
-        assertEquals(message, report.getMessage());
+        assertEquals(CommonApexStarterRestServer.SELF, report.getUrl());
+        assertTrue(report.isHealthy());
+        assertEquals(200, report.getCode());
+        assertEquals(CommonApexStarterRestServer.ALIVE, report.getMessage());
     }
 }