divijvaidya commented on code in PR #13966:
URL: https://github.com/apache/kafka/pull/13966#discussion_r1266621190


##########
clients/src/main/java/org/apache/kafka/common/network/DefaultChannelMetadataRegistry.java:
##########
@@ -16,15 +16,15 @@
  */
 package org.apache.kafka.common.network;
 
+import java.util.Objects;
+
 public class DefaultChannelMetadataRegistry implements ChannelMetadataRegistry 
{
     private CipherInformation cipherInformation;
     private ClientInformation clientInformation;
 
     @Override
     public void registerCipherInformation(final CipherInformation 
cipherInformation) {
-        if (this.cipherInformation != null) {
-            this.cipherInformation = cipherInformation;
-        }
+        this.cipherInformation =  Objects.requireNonNull(cipherInformation);

Review Comment:
   > Will we want to keep the added unit test in this case, any thoughts?
   
   No. unit test for a test will not be required in that case. Let's move that 
file to tests. Although it's a public class but it cannot be used outside of 
Kafka code base. 



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