chore(docs):[#616] fix sonar issues

irs-edc-client/src/main/java/org/eclipse/tractusx/irs/edc/client/EdcSubmodelClientLocalStub.java

@@ -44,6 +44,7 @@
 @SuppressWarnings("PMD.UseObjectForClearerAPI")
 public class EdcSubmodelClientLocalStub implements EdcSubmodelClient {
 
+    public static final String NOT_IMPLEMENTED = "Not implemented";
     private final SubmodelTestdataCreator testdataCreator;
 
     /* package */
@@ -73,18 +74,18 @@ public CompletableFuture<EdcNotificationResponse> sendNotification(final String
     public List<CompletableFuture<EndpointDataReference>> getEndpointReferencesForAsset(final String endpointAddress,
             final String filterKey, final String filterValue,
             final EndpointDataReferenceStatus cachedEndpointDataReference, final String bpn) throws EdcClientException {
-        throw new EdcClientException("Not implemented");
+        throw new EdcClientException(NOT_IMPLEMENTED);
     }
 
     @Override
     public List<CompletableFuture<EndpointDataReference>> getEndpointReferencesForAsset(final String endpointAddress,
             final String filterKey, final String filterValue, final String bpn) throws EdcClientException {
-        throw new EdcClientException("Not implemented");
+        throw new EdcClientException(NOT_IMPLEMENTED);
     }
 
     @Override
     public List<CompletableFuture<EndpointDataReference>> getEndpointReferencesForRegistryAsset(
             final String endpointAddress, final String bpn) throws EdcClientException {
-        throw new EdcClientException("Not implemented");
+        throw new EdcClientException(NOT_IMPLEMENTED);
     }
 }

irs-edc-client/src/test/java/org/eclipse/tractusx/irs/edc/client/EdcSubmodelClientTest.java

@@ -519,7 +519,7 @@ void shouldRetrieveEndpointReferenceForRegistryAssetForNewIdentifier() throws Ex
     }
 
     @Test
-    void shouldFailEndpointReferenceRetrievalForNoRegistryAsset() throws Exception {
+    void shouldFailEndpointReferenceRetrievalForNoRegistryAsset() {
         // arrange
         final String edcUrl = "https://edc.controlplane.org/public";
         when(config.getControlplane().getProviderSuffix()).thenReturn(PROVIDER_SUFFIX);