Give better messages than NPE for missing data

When data is not available to actor operations, an NPE is generally
thrown.  Modified the code to provide more info about what is missing
than simply NPE.

Issue-ID: POLICY-2913
Change-Id: I37b6eadd966e0693508a6d552b7db4edf5410018
Signed-off-by: Jim Hahn <jrh3@att.com>

2 files changed, 19 insertions, 5 deletions

diff --git a/models-interactions/model-actors/actor.appclcm/src/main/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperation.java b/models-interactions/model-actors/actor.appclcm/src/main/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperation.java
index bf204781a..559709e9a 100644
--- a/models-interactions/model-actors/actor.appclcm/src/main/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperation.java
+++ b/models-interactions/model-actors/actor.appclcm/src/main/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperation.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2020-2021 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.
@@ -84,7 +84,7 @@ public class AppcLcmOperation extends BidirectionalTopicOperation<AppcLcmDmaapWr
          * Action Identifiers are required for APPC LCM requests. For R1, the recipes
          * supported by Policy only require a vnf-id.
          */
-        String target = getProperty(OperationProperties.AAI_TARGET_ENTITY);
+        String target = getRequiredProperty(OperationProperties.AAI_TARGET_ENTITY, "target entity");
         inputRequest.setActionIdentifiers(Map.of(VNF_ID_KEY, target));
 
         /*
diff --git a/models-interactions/model-actors/actor.appclcm/src/test/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperationTest.java b/models-interactions/model-actors/actor.appclcm/src/test/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperationTest.java
index b9999f4a1..36496455a 100644
--- a/models-interactions/model-actors/actor.appclcm/src/test/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperationTest.java
+++ b/models-interactions/model-actors/actor.appclcm/src/test/java/org/onap/policy/controlloop/actor/appclcm/AppcLcmOperationTest.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * ONAP
  * ================================================================================
- * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * Copyright (C) 2020-2021 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.
@@ -22,7 +22,7 @@ package org.onap.policy.controlloop.actor.appclcm;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
+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;
@@ -159,6 +159,18 @@ public class AppcLcmOperationTest extends BasicBidirectionalTopicOperation<AppcL
         assertEquals(subreq, request.getBody().getInput().getCommonHeader().getSubRequestId());
     }
 
+    /**
+     * Tests makeRequest() when a property is missing.
+     */
+    @Test
+    public void testMakeRequestMissingProperty() throws Exception {
+        oper = new AppcLcmOperation(params, config);
+        oper.generateSubRequestId(1);
+
+        assertThatIllegalStateException().isThrownBy(() -> oper.makeRequest(1))
+                        .withMessageContaining("missing target entity");
+    }
+
     @Test
     public void testConvertPayload() {
         // only builds a payload for ConfigModify
@@ -183,9 +195,11 @@ public class AppcLcmOperationTest extends BasicBidirectionalTopicOperation<AppcL
             }
         };
 
+        oper.setProperty(OperationProperties.AAI_TARGET_ENTITY, TARGET_ENTITY);
         oper.generateSubRequestId(2);
 
-        assertThatThrownBy(() -> oper.makeRequest(2)).isInstanceOf(NullPointerException.class);
+        assertThatIllegalArgumentException().isThrownBy(() -> oper.makeRequest(2))
+                        .withMessageContaining("Cannot convert payload");
     }
 
     @Test