clolov commented on code in PR #12010:
URL: https://github.com/apache/kafka/pull/12010#discussion_r855718929


##########
core/src/main/scala/kafka/server/KafkaConfig.scala:
##########
@@ -1139,7 +1139,7 @@ object KafkaConfig {
       .define(MetadataMaxRetentionMillisProp, LONG, Defaults.LogRetentionHours 
* 60 * 60 * 1000L, null, HIGH, MetadataMaxRetentionMillisDoc)
 
       /************* Authorizer Configuration ***********/
-      .define(AuthorizerClassNameProp, STRING, Defaults.AuthorizerClassName, 
LOW, AuthorizerClassNameDoc)
+      .define(AuthorizerClassNameProp, STRING, Defaults.AuthorizerClassName, 
new ConfigDef.NonNullValidator(), LOW, AuthorizerClassNameDoc)

Review Comment:
   I think Scala allows you to just write `ConfigDef.NonNullValidator` without 
the `new` keyword and the `()`, but I might be wrong.



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