Global Exception Handler

Issue-ID: CCSDK-3054
Change-Id: I0281e616b58bb405b4f79d046af5c30b82753ea0
Signed-off-by: Lathish <lathishbabu.ganesan@est.tech>

12 files changed, 254 insertions, 187 deletions

diff --git a/a1-policy-management/api/pms-api.json b/a1-policy-management/api/pms-api.json
index 173d8df1..126eab56 100644
--- a/a1-policy-management/api/pms-api.json
+++ b/a1-policy-management/api/pms-api.json
@@ -17,7 +17,7 @@
                 "401": {"description": "Unauthorized"},
                 "403": {"description": "Forbidden"},
                 "404": {
-                    "schema": {"type": "string"},
+                    "schema": {"$ref": "#/definitions/error_information"},
                     "description": "Near-RT RIC is not found"
                 }
             },
@@ -79,7 +79,7 @@
                 "summary": "Returns service information",
                 "deprecated": false,
                 "produces": ["*/*"],
-                "operationId": "getServicesUsingGET",
+                "operationId": "getServicesUsingGET_1",
                 "responses": {
                     "200": {
                         "schema": {
@@ -109,7 +109,7 @@
                 "summary": "Delete a service",
                 "deprecated": false,
                 "produces": ["*/*"],
-                "operationId": "deleteServiceUsingDELETE",
+                "operationId": "deleteServiceUsingDELETE_1",
                 "responses": {
                     "200": {
                         "schema": {"type": "string"},
@@ -141,7 +141,7 @@
             "summary": "Unregister a service",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "deleteServiceUsingDELETE_1",
+            "operationId": "deleteServiceUsingDELETE",
             "responses": {
                 "200": {"description": "Not used"},
                 "401": {"description": "Unauthorized"},
@@ -177,7 +177,10 @@
                     },
                     "401": {"description": "Unauthorized"},
                     "403": {"description": "Forbidden"},
-                    "404": {"description": "Policy is not found"}
+                    "404": {
+                        "schema": {"$ref": "#/definitions/error_information"},
+                        "description": "Policy is not found"
+                    }
                 },
                 "parameters": [{
                     "in": "query",
@@ -409,7 +412,7 @@
                 "401": {"description": "Unauthorized"},
                 "403": {"description": "Forbidden"},
                 "404": {
-                    "schema": {"type": "string"},
+                    "schema": {"$ref": "#/definitions/error_information"},
                     "description": "The policy type is not found"
                 }
             },
@@ -427,7 +430,7 @@
             "summary": "Query Near-RT RIC information",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "getRicsUsingGET",
+            "operationId": "getRicsUsingGET_1",
             "responses": {
                 "200": {
                     "schema": {
@@ -511,7 +514,7 @@
             "deprecated": false,
             "produces": ["application/json"],
             "description": "The call returns all Near-RT RICs that supports a given policy type identity",
-            "operationId": "getRicsUsingGET_1",
+            "operationId": "getRicsUsingGET",
             "responses": {
                 "200": {
                     "schema": {"$ref": "#/definitions/ric_info_list_v2"},
@@ -651,7 +654,7 @@
                 "401": {"description": "Unauthorized"},
                 "403": {"description": "Forbidden"},
                 "404": {
-                    "schema": {"type": "string"},
+                    "schema": {"$ref": "#/definitions/error_information"},
                     "description": "Near-RT RIC is not found"
                 }
             },
@@ -717,7 +720,7 @@
                 "deprecated": false,
                 "produces": ["application/json"],
                 "description": "Either information about a registered service with given identity or all registered services are returned.",
-                "operationId": "getServicesUsingGET_1",
+                "operationId": "getServicesUsingGET",
                 "responses": {
                     "200": {
                         "schema": {"$ref": "#/definitions/service_list_v2"},
@@ -745,7 +748,7 @@
                 "deprecated": false,
                 "produces": ["*/*"],
                 "description": "Registering a service is needed to:<ul><li>Get callbacks.<\/li><li>Activate supervision of the service. If a service is inactive, its policies will be deleted.<\/li><\/ul>",
-                "operationId": "putServiceUsingPUT_1",
+                "operationId": "putServiceUsingPUT",
                 "responses": {
                     "200": {
                         "schema": {"type": "object"},
@@ -778,7 +781,7 @@
             "summary": "Returns the name of a RIC managing one Mananged Element",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "getRicUsingGET",
+            "operationId": "getRicUsingGET_1",
             "responses": {
                 "200": {
                     "schema": {"type": "string"},
@@ -805,7 +808,7 @@
             "summary": "Heartbeat from a service",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "keepAliveServiceUsingPUT",
+            "operationId": "keepAliveServiceUsingPUT_1",
             "responses": {
                 "200": {
                     "schema": {"type": "string"},
@@ -831,7 +834,7 @@
             "summary": "Heartbeat indicates that the service is running",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "keepAliveServiceUsingPUT_1",
+            "operationId": "keepAliveServiceUsingPUT",
             "responses": {
                 "200": {
                     "schema": {"type": "object"},
@@ -876,7 +879,7 @@
             "deprecated": false,
             "produces": ["application/json"],
             "description": "Either a Near-RT RIC identity or a Mananged Element identity can be specified.<br>The intention with Mananged Element identity is the ID used in O1 for accessing the traffical element (such as the ID of CU).",
-            "operationId": "getRicUsingGET_1",
+            "operationId": "getRicUsingGET",
             "responses": {
                 "200": {
                     "schema": {"$ref": "#/definitions/ric_info_v2"},
@@ -962,7 +965,7 @@
             "summary": "Register a service",
             "deprecated": false,
             "produces": ["*/*"],
-            "operationId": "putServiceUsingPUT",
+            "operationId": "putServiceUsingPUT_1",
             "responses": {
                 "200": {
                     "schema": {"type": "string"},
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/PolicyController.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/PolicyController.java
index e1d60de3..6c5ebd90 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/PolicyController.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/PolicyController.java
@@ -39,7 +39,8 @@ import lombok.Getter;
 
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
 import org.onap.ccsdk.oran.a1policymanagementservice.controllers.VoidResponse;
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.controllers.v2.ErrorResponse;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.ImmutablePolicy;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
@@ -97,38 +98,30 @@ public class PolicyController {
     @ApiOperation(value = "Returns policy type schema definitions")
     @ApiResponses(value = {
             @ApiResponse(code = 200, message = "Policy schemas", response = Object.class, responseContainer = "List"), //
-            @ApiResponse(code = 404, message = "Near-RT RIC is not found", response = String.class)})
+            @ApiResponse(code = 404, message = "Near-RT RIC is not found", response = ErrorResponse.ErrorInfo.class)})
     public ResponseEntity<String> getPolicySchemas( //
             @ApiParam(name = "ric", required = false, value = "The name of the Near-RT RIC to get the definitions for.") //
-            @RequestParam(name = "ric", required = false) String ricName) {
+            @RequestParam(name = "ric", required = false) String ricName) throws EntityNotFoundException {
         if (ricName == null) {
             Collection<PolicyType> types = this.policyTypes.getAll();
             return new ResponseEntity<>(toPolicyTypeSchemasJson(types), HttpStatus.OK);
         } else {
-            try {
-                Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
-                return new ResponseEntity<>(toPolicyTypeSchemasJson(types), HttpStatus.OK);
-            } catch (ServiceException e) {
-                return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
-            }
+            Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
+            return new ResponseEntity<>(toPolicyTypeSchemasJson(types), HttpStatus.OK);
         }
     }
 
     @GetMapping("/policy_schema")
     @ApiOperation(value = "Returns one policy type schema definition")
     @ApiResponses(value = { //
-            @ApiResponse(code = 200, message = "Policy schema", response = Object.class),
-            @ApiResponse(code = 404, message = "The policy type is not found", response = String.class)})
+            @ApiResponse(code = 200, message = "Policy schema", response = Object.class), @ApiResponse(code = 404,
+                    message = "The policy type is not found", response = ErrorResponse.ErrorInfo.class)})
     public ResponseEntity<String> getPolicySchema( //
             @ApiParam(name = "id", required = true,
                     value = "The identity of the policy type to get the definition for.") //
-            @RequestParam(name = "id", required = true) String id) {
-        try {
-            PolicyType type = policyTypes.getType(id);
-            return new ResponseEntity<>(type.schema(), HttpStatus.OK);
-        } catch (ServiceException e) {
-            return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
-        }
+            @RequestParam(name = "id", required = true) String id) throws EntityNotFoundException {
+        PolicyType type = policyTypes.getType(id);
+        return new ResponseEntity<>(type.schema(), HttpStatus.OK);
     }
 
     @GetMapping("/policy_types")
@@ -136,20 +129,16 @@ public class PolicyController {
     @ApiResponses(value = {
             @ApiResponse(code = 200, message = "Policy type names", response = String.class,
                     responseContainer = "List"),
-            @ApiResponse(code = 404, message = "Near-RT RIC is not found", response = String.class)})
+            @ApiResponse(code = 404, message = "Near-RT RIC is not found", response = ErrorResponse.ErrorInfo.class)})
     public ResponseEntity<String> getPolicyTypes( //
             @ApiParam(name = "ric", required = false, value = "The name of the Near-RT RIC to get types for.") //
-            @RequestParam(name = "ric", required = false) String ricName) {
+            @RequestParam(name = "ric", required = false) String ricName) throws EntityNotFoundException {
         if (ricName == null) {
             Collection<PolicyType> types = this.policyTypes.getAll();
             return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
         } else {
-            try {
-                Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
-                return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
-            } catch (ServiceException e) {
-                return new ResponseEntity<>(e.toString(), HttpStatus.NOT_FOUND);
-            }
+            Collection<PolicyType> types = rics.getRic(ricName).getSupportedPolicyTypes();
+            return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
         }
     }
 
@@ -157,17 +146,13 @@ public class PolicyController {
     @ApiOperation(value = "Returns a policy configuration") //
     @ApiResponses(value = { //
             @ApiResponse(code = 200, message = "Policy found", response = Object.class), //
-            @ApiResponse(code = 404, message = "Policy is not found")} //
+            @ApiResponse(code = 404, message = "Policy is not found", response = ErrorResponse.ErrorInfo.class)} //
     )
     public ResponseEntity<String> getPolicy( //
             @ApiParam(name = "id", required = true, value = "The identity of the policy instance.") //
-            @RequestParam(name = "id", required = true) String id) {
-        try {
-            Policy p = policies.getPolicy(id);
-            return new ResponseEntity<>(p.json(), HttpStatus.OK);
-        } catch (ServiceException e) {
-            return new ResponseEntity<>(e.getMessage(), HttpStatus.NOT_FOUND);
-        }
+            @RequestParam(name = "id", required = true) String id) throws EntityNotFoundException {
+        Policy p = policies.getPolicy(id);
+        return new ResponseEntity<>(p.json(), HttpStatus.OK);
     }
 
     @DeleteMapping("/policy")
@@ -179,23 +164,19 @@ public class PolicyController {
             @ApiResponse(code = 423, message = "Near-RT RIC is not operational", response = String.class)})
     public Mono<ResponseEntity<Object>> deletePolicy( //
             @ApiParam(name = "id", required = true, value = "The identity of the policy instance.") //
-            @RequestParam(name = "id", required = true) String id) {
-        try {
-            Policy policy = policies.getPolicy(id);
-            keepServiceAlive(policy.ownerServiceId());
-            Ric ric = policy.ric();
-            return ric.getLock().lock(LockType.SHARED) //
-                    .flatMap(notUsed -> assertRicStateIdle(ric)) //
-                    .flatMap(notUsed -> a1ClientFactory.createA1Client(policy.ric())) //
-                    .doOnNext(notUsed -> policies.remove(policy)) //
-                    .flatMap(client -> client.deletePolicy(policy)) //
-                    .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
-                    .doOnError(notUsed -> ric.getLock().unlockBlocking()) //
-                    .flatMap(notUsed -> Mono.just(new ResponseEntity<>(HttpStatus.NO_CONTENT)))
-                    .onErrorResume(this::handleException);
-        } catch (ServiceException e) {
-            return Mono.just(new ResponseEntity<>(HttpStatus.NOT_FOUND));
-        }
+            @RequestParam(name = "id", required = true) String id) throws EntityNotFoundException {
+        Policy policy = policies.getPolicy(id);
+        keepServiceAlive(policy.ownerServiceId());
+        Ric ric = policy.ric();
+        return ric.getLock().lock(LockType.SHARED) //
+                .flatMap(notUsed -> assertRicStateIdle(ric)) //
+                .flatMap(notUsed -> a1ClientFactory.createA1Client(policy.ric())) //
+                .doOnNext(notUsed -> policies.remove(policy)) //
+                .flatMap(client -> client.deletePolicy(policy)) //
+                .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
+                .doOnError(notUsed -> ric.getLock().unlockBlocking()) //
+                .flatMap(notUsed -> Mono.just(new ResponseEntity<>(HttpStatus.NO_CONTENT)))
+                .onErrorResume(this::handleException);
     }
 
     @PutMapping(path = "/policy")
@@ -364,17 +345,14 @@ public class PolicyController {
     )
     public Mono<ResponseEntity<String>> getPolicyStatus( //
             @ApiParam(name = "id", required = true, value = "The identity of the policy.") @RequestParam(name = "id", //
-                    required = true) String id) {
-        try {
-            Policy policy = policies.getPolicy(id);
-
-            return a1ClientFactory.createA1Client(policy.ric()) //
-                    .flatMap(client -> client.getPolicyStatus(policy)) //
-                    .flatMap(status -> Mono.just(new ResponseEntity<>(status, HttpStatus.OK)))
-                    .onErrorResume(this::handleException);
-        } catch (ServiceException e) {
-            return Mono.just(new ResponseEntity<>(e.getMessage(), HttpStatus.NOT_FOUND));
-        }
+                    required = true) String id)
+            throws EntityNotFoundException {
+        Policy policy = policies.getPolicy(id);
+
+        return a1ClientFactory.createA1Client(policy.ric()) //
+                .flatMap(client -> client.getPolicyStatus(policy)) //
+                .flatMap(status -> Mono.just(new ResponseEntity<>(status, HttpStatus.OK)))
+                .onErrorResume(this::handleException);
     }
 
     private void keepServiceAlive(String name) {
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/RicRepositoryController.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/RicRepositoryController.java
index 4e57ada8..224935e3 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/RicRepositoryController.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v1/RicRepositoryController.java
@@ -31,8 +31,8 @@ import io.swagger.annotations.ApiResponses;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Optional;
 
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
@@ -58,6 +58,8 @@ public class RicRepositoryController {
 
     /**
      * Example: http://localhost:8081/rics?managedElementId=kista_1
+     * 
+     * @throws EntityNotFoundException
      */
     @GetMapping("/ric")
     @ApiOperation(value = "Returns the name of a RIC managing one Mananged Element")
@@ -67,14 +69,10 @@ public class RicRepositoryController {
     })
     public ResponseEntity<String> getRic( //
             @ApiParam(name = "managedElementId", required = true, value = "The identity of the Managed Element") //
-            @RequestParam(name = "managedElementId", required = true) String managedElementId) {
-        Optional<Ric> ric = this.rics.lookupRicForManagedElement(managedElementId);
-
-        if (ric.isPresent()) {
-            return new ResponseEntity<>(ric.get().id(), HttpStatus.OK);
-        } else {
-            return new ResponseEntity<>("No RIC found", HttpStatus.NOT_FOUND);
-        }
+            @RequestParam(name = "managedElementId", required = true) String managedElementId)
+            throws EntityNotFoundException {
+        Ric ric = this.rics.lookupRicForManagedElement(managedElementId);
+        return new ResponseEntity<>(ric.id(), HttpStatus.OK);
     }
 
     /**
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/ErrorResponse.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/ErrorResponse.java
index 988fbc2a..da321655 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/ErrorResponse.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/ErrorResponse.java
@@ -33,7 +33,7 @@ import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import reactor.core.publisher.Mono;
 
-class ErrorResponse {
+public class ErrorResponse {
     private static Gson gson = new GsonBuilder() //
             .create(); //
 
@@ -97,7 +97,7 @@ class ErrorResponse {
         return new ResponseEntity<>(json, headers, code);
     }
 
-    static ResponseEntity<Object> create(Exception e, HttpStatus code) {
+    public static ResponseEntity<Object> create(Exception e, HttpStatus code) {
         return create(e.toString(), code);
     }
 
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
index ea047cb5..850635f6 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/PolicyController.java
@@ -39,7 +39,7 @@ import lombok.Getter;
 
 import org.onap.ccsdk.oran.a1policymanagementservice.clients.A1ClientFactory;
 import org.onap.ccsdk.oran.a1policymanagementservice.controllers.VoidResponse;
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.ImmutablePolicy;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Lock.LockType;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Policies;
@@ -104,14 +104,10 @@ public class PolicyController {
             @ApiResponse(code = 200, message = "Policy type", response = PolicyTypeInfo.class), //
             @ApiResponse(code = 404, message = "Policy type is not found", response = ErrorResponse.ErrorInfo.class)})
     public ResponseEntity<Object> getPolicyType( //
-            @PathVariable("policytype_id") String policyTypeId) {
-        try {
-            PolicyType type = policyTypes.getType(policyTypeId);
-            PolicyTypeInfo info = new PolicyTypeInfo(type.schema());
-            return new ResponseEntity<>(gson.toJson(info), HttpStatus.OK);
-        } catch (ServiceException e) {
-            return ErrorResponse.create(e, HttpStatus.NOT_FOUND);
-        }
+            @PathVariable("policytype_id") String policyTypeId) throws EntityNotFoundException {
+        PolicyType type = policyTypes.getType(policyTypeId);
+        PolicyTypeInfo info = new PolicyTypeInfo(type.schema());
+        return new ResponseEntity<>(gson.toJson(info), HttpStatus.OK);
     }
 
     @GetMapping(path = Consts.V2_API_ROOT + "/policy-types", produces = MediaType.APPLICATION_JSON_VALUE)
@@ -121,17 +117,13 @@ public class PolicyController {
     public ResponseEntity<Object> getPolicyTypes( //
             @ApiParam(name = Consts.RIC_ID_PARAM, required = false,
                     value = "The identity of the Near-RT RIC to get types for.") //
-            @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId) {
+            @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId) throws EntityNotFoundException {
         if (ricId == null) {
             Collection<PolicyType> types = this.policyTypes.getAll();
             return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
         } else {
-            try {
-                Collection<PolicyType> types = rics.getRic(ricId).getSupportedPolicyTypes();
-                return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
-            } catch (ServiceException e) {
-                return ErrorResponse.create(e, HttpStatus.NOT_FOUND);
-            }
+            Collection<PolicyType> types = rics.getRic(ricId).getSupportedPolicyTypes();
+            return new ResponseEntity<>(toPolicyTypeIdsJson(types), HttpStatus.OK);
         }
     }
 
@@ -142,13 +134,9 @@ public class PolicyController {
             @ApiResponse(code = 404, message = "Policy is not found", response = ErrorResponse.ErrorInfo.class)} //
     )
     public ResponseEntity<Object> getPolicy( //
-            @PathVariable(name = Consts.POLICY_ID_PARAM, required = true) String id) {
-        try {
-            Policy p = policies.getPolicy(id);
-            return new ResponseEntity<>(gson.toJson(toPolicyInfo(p)), HttpStatus.OK);
-        } catch (ServiceException e) {
-            return ErrorResponse.create(e, HttpStatus.NOT_FOUND);
-        }
+            @PathVariable(name = Consts.POLICY_ID_PARAM, required = true) String id) throws EntityNotFoundException {
+        Policy p = policies.getPolicy(id);
+        return new ResponseEntity<>(gson.toJson(toPolicyInfo(p)), HttpStatus.OK);
     }
 
     @DeleteMapping(Consts.V2_API_ROOT + "/policies/{policy_id:.+}")
@@ -160,23 +148,19 @@ public class PolicyController {
             @ApiResponse(code = 423, message = "Near-RT RIC is not operational",
                     response = ErrorResponse.ErrorInfo.class)})
     public Mono<ResponseEntity<Object>> deletePolicy( //
-            @PathVariable(Consts.POLICY_ID_PARAM) String policyId) {
-        try {
-            Policy policy = policies.getPolicy(policyId);
-            keepServiceAlive(policy.ownerServiceId());
-            Ric ric = policy.ric();
-            return ric.getLock().lock(LockType.SHARED) //
-                    .flatMap(notUsed -> assertRicStateIdle(ric)) //
-                    .flatMap(notUsed -> a1ClientFactory.createA1Client(policy.ric())) //
-                    .doOnNext(notUsed -> policies.remove(policy)) //
-                    .flatMap(client -> client.deletePolicy(policy)) //
-                    .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
-                    .doOnError(notUsed -> ric.getLock().unlockBlocking()) //
-                    .flatMap(notUsed -> Mono.just(new ResponseEntity<>(HttpStatus.NO_CONTENT)))
-                    .onErrorResume(this::handleException);
-        } catch (ServiceException e) {
-            return ErrorResponse.createMono(e, HttpStatus.NOT_FOUND);
-        }
+            @PathVariable(Consts.POLICY_ID_PARAM) String policyId) throws EntityNotFoundException {
+        Policy policy = policies.getPolicy(policyId);
+        keepServiceAlive(policy.ownerServiceId());
+        Ric ric = policy.ric();
+        return ric.getLock().lock(LockType.SHARED) //
+                .flatMap(notUsed -> assertRicStateIdle(ric)) //
+                .flatMap(notUsed -> a1ClientFactory.createA1Client(policy.ric())) //
+                .doOnNext(notUsed -> policies.remove(policy)) //
+                .flatMap(client -> client.deletePolicy(policy)) //
+                .doOnNext(notUsed -> ric.getLock().unlockBlocking()) //
+                .doOnError(notUsed -> ric.getLock().unlockBlocking()) //
+                .flatMap(notUsed -> Mono.just(new ResponseEntity<>(HttpStatus.NO_CONTENT)))
+                .onErrorResume(this::handleException);
     }
 
     @PutMapping(path = Consts.V2_API_ROOT + "/policies", produces = MediaType.APPLICATION_JSON_VALUE)
@@ -189,7 +173,7 @@ public class PolicyController {
             @ApiResponse(code = 404, message = "Near-RT RIC or policy type is not found",
                     response = ErrorResponse.ErrorInfo.class) //
     })
-    public Mono<ResponseEntity<Object>> putPolicy(@RequestBody PolicyInfo policyInfo) {
+    public Mono<ResponseEntity<Object>> putPolicy(@RequestBody PolicyInfo policyInfo) throws EntityNotFoundException {
 
         if (!policyInfo.validate()) {
             return ErrorResponse.createMono("Missing required parameter in body", HttpStatus.BAD_REQUEST);
@@ -199,7 +183,7 @@ public class PolicyController {
         PolicyType type = policyTypes.get(policyInfo.policyTypeId);
         keepServiceAlive(policyInfo.serviceId);
         if (ric == null || type == null) {
-            return ErrorResponse.createMono("Near-RT RIC or policy type not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Near-RT RIC or policy type not found");
         }
         Policy policy = ImmutablePolicy.builder() //
                 .id(policyInfo.policyId) //
@@ -293,13 +277,14 @@ public class PolicyController {
             @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ric, //
             @ApiParam(name = Consts.SERVICE_ID_PARAM, required = false,
                     value = "The identity of the service to get policies for.") //
-            @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String service) //
+            @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String service)
+            throws EntityNotFoundException //
     {
         if ((type != null && this.policyTypes.get(type) == null)) {
-            return ErrorResponse.create("Policy type not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Policy type not found");
         }
         if ((ric != null && this.rics.get(ric) == null)) {
-            return ErrorResponse.create("Near-RT RIC not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Near-RT RIC not found");
         }
 
         String filteredPolicies = policiesToJson(filter(type, ric, service));
@@ -320,13 +305,14 @@ public class PolicyController {
             @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId, //
             @ApiParam(name = Consts.SERVICE_ID_PARAM, required = false,
                     value = "The identity of the service to get policies for.") //
-            @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String serviceId) //
+            @RequestParam(name = Consts.SERVICE_ID_PARAM, required = false) String serviceId)
+            throws EntityNotFoundException //
     {
         if ((policyTypeId != null && this.policyTypes.get(policyTypeId) == null)) {
-            return ErrorResponse.create("Policy type not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Policy type not found");
         }
         if ((ricId != null && this.rics.get(ricId) == null)) {
-            return ErrorResponse.create("Near-RT RIC not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Near-RT RIC not found");
         }
 
         String policyIdsJson = toPolicyIdsJson(filter(policyTypeId, ricId, serviceId));
@@ -340,23 +326,20 @@ public class PolicyController {
             @ApiResponse(code = 404, message = "Policy is not found", response = ErrorResponse.ErrorInfo.class)} //
     )
     public Mono<ResponseEntity<Object>> getPolicyStatus( //
-            @PathVariable(Consts.POLICY_ID_PARAM) String policyId) {
-        try {
-            Policy policy = policies.getPolicy(policyId);
-
-            return a1ClientFactory.createA1Client(policy.ric()) //
-                    .flatMap(client -> client.getPolicyStatus(policy).onErrorResume(e -> Mono.just("{}"))) //
-                    .flatMap(status -> createPolicyStatus(policy, status)) //
-                    .onErrorResume(this::handleException);
-        } catch (ServiceException e) {
-            return ErrorResponse.createMono(e, HttpStatus.NOT_FOUND);
-        }
+            @PathVariable(Consts.POLICY_ID_PARAM) String policyId) throws EntityNotFoundException {
+        Policy policy = policies.getPolicy(policyId);
+
+        return a1ClientFactory.createA1Client(policy.ric()) //
+                .flatMap(client -> client.getPolicyStatus(policy).onErrorResume(e -> Mono.just("{}"))) //
+                .flatMap(status -> createPolicyStatus(policy, status)) //
+                .onErrorResume(this::handleException);
+
     }
 
     private Mono<ResponseEntity<Object>> createPolicyStatus(Policy policy, String statusFromNearRic) {
         PolicyStatusInfo info = new PolicyStatusInfo(policy.lastModified(), fromJson(statusFromNearRic));
         String str = gson.toJson(info);
-        return Mono.just(new ResponseEntity<>((Object) str, HttpStatus.OK));
+        return Mono.just(new ResponseEntity<>(str, HttpStatus.OK));
     }
 
     private void keepServiceAlive(String name) {
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/RicRepositoryController.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/RicRepositoryController.java
index a77a7e7e..f07efa2c 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/RicRepositoryController.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/controllers/v2/RicRepositoryController.java
@@ -31,9 +31,9 @@ import io.swagger.annotations.ApiResponses;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Optional;
 
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.InvalidRequestException;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.PolicyTypes;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Ric;
 import org.onap.ccsdk.oran.a1policymanagementservice.repository.Rics;
@@ -65,6 +65,8 @@ public class RicRepositoryController {
 
     /**
      * Example: http://localhost:8081/v2/rics/ric?managed_element_id=kista_1
+     * 
+     * @throws EntityNotFoundException
      */
     @GetMapping(path = Consts.V2_API_ROOT + "/rics/ric", produces = MediaType.APPLICATION_JSON_VALUE)
     @ApiOperation(value = GET_RIC_BRIEF, notes = GET_RIC_DETAILS)
@@ -78,25 +80,18 @@ public class RicRepositoryController {
             @RequestParam(name = Consts.MANAGED_ELEMENT_ID_PARAM, required = false) String managedElementId,
             @ApiParam(name = Consts.RIC_ID_PARAM, required = false,
                     value = "The identity of a Near-RT RIC to get information for.") //
-            @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId) {
-        try {
-            if (managedElementId != null && ricId != null) {
-                return ErrorResponse.create("Give one query parameter", HttpStatus.BAD_REQUEST);
-            } else if (managedElementId != null) {
-                Optional<Ric> ric = this.rics.lookupRicForManagedElement(managedElementId);
-                if (ric.isPresent()) {
-                    return new ResponseEntity<>(gson.toJson(toRicInfo(ric.get())), HttpStatus.OK);
-                } else {
-                    return ErrorResponse.create("No Near-RT RIC managing the ME is found", HttpStatus.NOT_FOUND);
-                }
-            } else if (ricId != null) {
-                RicInfo info = toRicInfo(this.rics.getRic(ricId));
-                return new ResponseEntity<>(gson.toJson(info), HttpStatus.OK);
-            } else {
-                return ErrorResponse.create("Give one query parameter", HttpStatus.BAD_REQUEST);
-            }
-        } catch (ServiceException e) {
-            return ErrorResponse.create(e, HttpStatus.NOT_FOUND);
+            @RequestParam(name = Consts.RIC_ID_PARAM, required = false) String ricId)
+            throws EntityNotFoundException, InvalidRequestException {
+        if (managedElementId != null && ricId != null) {
+            throw new InvalidRequestException("Give one query parameter");
+        } else if (managedElementId != null) {
+            Ric ric = this.rics.lookupRicForManagedElement(managedElementId);
+            return new ResponseEntity<>(gson.toJson(toRicInfo(ric)), HttpStatus.OK);
+        } else if (ricId != null) {
+            RicInfo info = toRicInfo(this.rics.getRic(ricId));
+            return new ResponseEntity<>(gson.toJson(info), HttpStatus.OK);
+        } else {
+            throw new InvalidRequestException("Give one query parameter");
         }
     }
 
@@ -105,6 +100,7 @@ public class RicRepositoryController {
 
     /**
      * @return a Json array of all RIC data Example: http://localhost:8081/v2/ric
+     * @throws EntityNotFoundException
      */
     @GetMapping(path = Consts.V2_API_ROOT + "/rics", produces = MediaType.APPLICATION_JSON_VALUE)
     @ApiOperation(value = "Query Near-RT RIC information", notes = QUERY_RIC_INFO_DETAILS)
@@ -114,11 +110,10 @@ public class RicRepositoryController {
     public ResponseEntity<Object> getRics( //
             @ApiParam(name = Consts.POLICY_TYPE_ID_PARAM, required = false,
                     value = "The identity of a policy type. If given, all Near-RT RICs supporteing the policy type are returned") //
-            @RequestParam(name = Consts.POLICY_TYPE_ID_PARAM, required = false) String supportingPolicyType
-
-    ) {
+            @RequestParam(name = Consts.POLICY_TYPE_ID_PARAM, required = false) String supportingPolicyType)
+            throws EntityNotFoundException {
         if ((supportingPolicyType != null) && (this.types.get(supportingPolicyType) == null)) {
-            return ErrorResponse.create("Policy type not found", HttpStatus.NOT_FOUND);
+            throw new EntityNotFoundException("Policy type not found");
         }
 
         List<RicInfo> result = new ArrayList<>();
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/EntityNotFoundException.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/EntityNotFoundException.java
new file mode 100644
index 00000000..ee9b7bf2
--- /dev/null
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/EntityNotFoundException.java
@@ -0,0 +1,34 @@
+/*-
+ * ========================LICENSE_START=================================
+ * ONAP : ccsdk oran
+ * ======================================================================
+ * Copyright (C) 2019-2020 Nordix Foundation. 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.
+ * 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.
+ * ========================LICENSE_END===================================
+ */
+
+package org.onap.ccsdk.oran.a1policymanagementservice.exceptions;
+
+public class EntityNotFoundException extends ServiceException {
+
+    private static final long serialVersionUID = 1L;
+
+    public EntityNotFoundException(String message) {
+        super(message);
+    }
+
+    public EntityNotFoundException(String message, Exception originalException) {
+        super(message, originalException);
+    }
+}
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/GlobalExceptionHandler.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/GlobalExceptionHandler.java
new file mode 100644
index 00000000..9d20d33f
--- /dev/null
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/GlobalExceptionHandler.java
@@ -0,0 +1,43 @@
+/*-
+ * ========================LICENSE_START=================================
+ * ONAP : ccsdk oran
+ * ======================================================================
+ * Copyright (C) 2019-2020 Nordix Foundation. 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.
+ * 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.
+ * ========================LICENSE_END===================================
+ */
+
+package org.onap.ccsdk.oran.a1policymanagementservice.exceptions;
+
+import org.onap.ccsdk.oran.a1policymanagementservice.controllers.v2.ErrorResponse;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+@ControllerAdvice(annotations = RestController.class)
+public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @ExceptionHandler(EntityNotFoundException.class)
+    public final ResponseEntity<Object> handleNotFoundException(EntityNotFoundException ex) {
+        return ErrorResponse.create(ex, HttpStatus.NOT_FOUND);
+    }
+
+    @ExceptionHandler(InvalidRequestException.class)
+    public final ResponseEntity<Object> handleInvalidRequestException(InvalidRequestException ex) {
+        return ErrorResponse.create(ex, HttpStatus.BAD_REQUEST);
+    }
+}
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/InvalidRequestException.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/InvalidRequestException.java
new file mode 100644
index 00000000..6ffd216b
--- /dev/null
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/exceptions/InvalidRequestException.java
@@ -0,0 +1,34 @@
+/*-
+ * ========================LICENSE_START=================================
+ * ONAP : ccsdk oran
+ * ======================================================================
+ * Copyright (C) 2019-2020 Nordix Foundation. 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.
+ * 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.
+ * ========================LICENSE_END===================================
+ */
+
+package org.onap.ccsdk.oran.a1policymanagementservice.exceptions;
+
+public class InvalidRequestException extends ServiceException {
+
+    private static final long serialVersionUID = 1L;
+
+    public InvalidRequestException(String message) {
+        super(message);
+    }
+
+    public InvalidRequestException(String message, Exception originalException) {
+        super(message, originalException);
+    }
+}
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Policies.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Policies.java
index 4df2504b..882d3368 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Policies.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Policies.java
@@ -27,7 +27,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.Vector;
 
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 
 public class Policies {
     private Map<String, Policy> policiesId = new HashMap<>();
@@ -72,10 +72,10 @@ public class Policies {
         return policiesId.get(id);
     }
 
-    public synchronized Policy getPolicy(String id) throws ServiceException {
+    public synchronized Policy getPolicy(String id) throws EntityNotFoundException {
         Policy p = policiesId.get(id);
         if (p == null) {
-            throw new ServiceException("Could not find policy: " + id);
+            throw new EntityNotFoundException("Could not find policy: " + id);
         }
         return p;
     }
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/PolicyTypes.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/PolicyTypes.java
index db25d9cc..7bf03782 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/PolicyTypes.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/PolicyTypes.java
@@ -25,15 +25,15 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Vector;
 
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 
 public class PolicyTypes {
     private Map<String, PolicyType> types = new HashMap<>();
 
-    public synchronized PolicyType getType(String name) throws ServiceException {
+    public synchronized PolicyType getType(String name) throws EntityNotFoundException {
         PolicyType t = types.get(name);
         if (t == null) {
-            throw new ServiceException("Could not find type: " + name);
+            throw new EntityNotFoundException("Could not find type: " + name);
         }
         return t;
     }
diff --git a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Rics.java b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Rics.java
index b6ec7491..e4918e76 100644
--- a/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Rics.java
+++ b/a1-policy-management/src/main/java/org/onap/ccsdk/oran/a1policymanagementservice/repository/Rics.java
@@ -23,10 +23,9 @@ package org.onap.ccsdk.oran.a1policymanagementservice.repository;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 import java.util.Vector;
 
-import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
+import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
 import org.springframework.lang.Nullable;
 
 /**
@@ -43,10 +42,10 @@ public class Rics {
         return new Vector<>(registeredRics.values());
     }
 
-    public synchronized Ric getRic(String ricId) throws ServiceException {
+    public synchronized Ric getRic(String ricId) throws EntityNotFoundException {
         Ric ric = registeredRics.get(ricId);
         if (ric == null) {
-            throw new ServiceException("Could not find ric: " + ricId);
+            throw new EntityNotFoundException("Could not find ric: " + ricId);
         }
         return ric;
     }
@@ -67,12 +66,12 @@ public class Rics {
         this.registeredRics.clear();
     }
 
-    public synchronized Optional<Ric> lookupRicForManagedElement(String managedElementId) {
+    public synchronized Ric lookupRicForManagedElement(String managedElementId) throws EntityNotFoundException {
         for (Ric ric : this.registeredRics.values()) {
             if (ric.getManagedElementIds().contains(managedElementId)) {
-                return Optional.of(ric);
+                return ric;
             }
         }
-        return Optional.empty();
+        throw new EntityNotFoundException("No Near-RT RIC managing the ME is found");
     }
 }