jsancio commented on code in PR #12885:
URL: https://github.com/apache/kafka/pull/12885#discussion_r1035441299


##########
core/src/main/scala/kafka/server/ControllerApis.scala:
##########
@@ -400,7 +407,8 @@ class ControllerApis(val requestChannel: RequestChannel,
         if (!authorizedTopicNames.contains(name)) {
           response.topics().add(new CreatableTopicResult().
             setName(name).
-            setErrorCode(TOPIC_AUTHORIZATION_FAILED.code))
+            setErrorCode(TOPIC_AUTHORIZATION_FAILED.code).
+            setErrorMessage("Authorization failed."))

Review Comment:
   Thanks for the background information. I found another issue while trying to 
implement this. The default for `CreateTopicsResponse.errorMessage` is the 
empty string, `""`, not `null`. This means that `ApiError.messageWithFallback` 
doesn't behave as expected.
   
   I am going to create an issue for this and tackle it in another PR.



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