divijvaidya commented on code in PR #13828:
URL: https://github.com/apache/kafka/pull/13828#discussion_r1224171314


##########
clients/src/main/java/org/apache/kafka/common/network/ListenerName.java:
##########
@@ -36,6 +36,7 @@ public static ListenerName 
forSecurityProtocol(SecurityProtocol securityProtocol
      * Create an instance with the provided value converted to uppercase.
      */
     public static ListenerName normalised(String value) {
+        Objects.requireNonNull(value);

Review Comment:
   nit
   do we want to check for empty and whitespaces, using `Utils.isBlank()`?



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