sabashaikh4 commented on code in PR #9854:
URL: https://github.com/apache/gravitino/pull/9854#discussion_r2765375138


##########
core/src/main/java/org/apache/gravitino/listener/api/event/ListTopicFailureEvent.java:
##########
@@ -39,10 +40,15 @@ public final class ListTopicFailureEvent extends 
TopicFailureEvent {
    * @param exception The exception encountered during the attempt to list 
topics.
    */
   public ListTopicFailureEvent(String user, Namespace namespace, Exception 
exception) {
-    super(user, NameIdentifier.of(namespace.levels()), exception);
+    super(user, toNameIdentifier(namespace), exception);
     this.namespace = namespace;
   }
 
+  private static NameIdentifier toNameIdentifier(Namespace namespace) {
+    Preconditions.checkNotNull(namespace, "namespace must not be null");

Review Comment:
   @jerryshao @justinmclean Thank you for the clarification! I've updated the 
code to use `checkArgument` as suggested. I also updated the test to expect 
`IllegalArgumentException` to match the implementation. All tests are now 
passing. 
   
   



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