- Add error-handling for the case when no payloads could be associated with a specific url which should have been in the hashMultiMap in "addUrlReportsByMatchingRecordsFromBacklog".

- Fix not cloning the payload, before changing it and adding it in the "prefilledPayloads"-list; instead, an object-reference was used.

src/main/java/eu/openaire/urls_controller/models/Payload.java

@@ -68,6 +68,14 @@ public class Payload {
         this.datasourceId = datasourceId;
     }
 
+
+    public Payload clone()
+    {
+        // Return a new object with the same values. Clone whatever objects are not immutable.!
+        return new Payload(this.id, this.original_url, this.actual_url, (Timestamp) this.timestamp_acquired.clone(), this.mime_type, this.size, this.hash,
+                this.location, this.provenance, this.datasourceId);
+    }
+
     public String getId() {
         return id;
     }

src/main/java/eu/openaire/urls_controller/util/FileUtils.java

@@ -804,6 +804,10 @@ public class FileUtils {
                     return; // Move to the next payload.
                 }
                 Set<Payload> foundPayloads = urlToPayloadsMultimap.get(original_url);
+                if ( foundPayloads == null ) {
+                    logger.error("No payloads associated with \"original_url\" = \"" + original_url + "\"!");
+                    return;
+                }
 
                 // Select a random "foundPayload" to use its data to fill the "prefilledPayload" (in a "Set" the first element is pseudo-random).
                 Optional<Payload> optPayload = foundPayloads.stream().findFirst();
@@ -811,7 +815,7 @@ public class FileUtils {
                     logger.error("Could not retrieve any payload for the \"original_url\": " + original_url);
                     return; // Move to the next payload.
                 }
-                Payload prefilledPayload = optPayload.get();    // We change just the id and the original_url.
+                Payload prefilledPayload = optPayload.get().clone();    // We take a clone of the original payload and change just the id and the original_url.
                 prefilledPayload.setId(id);
                 prefilledPayload.setOriginal_url(original_url);
                 prefilledPayloads.add(prefilledPayload);