plazma-prizma commented on code in PR #14491:
URL: https://github.com/apache/kafka/pull/14491#discussion_r1353388791


##########
clients/src/main/java/org/apache/kafka/common/network/ChannelBuilders.java:
##########
@@ -240,12 +242,19 @@ public static KafkaPrincipalBuilder 
createPrincipalBuilder(Map<String, ?> config
                                                                
KerberosShortNamer kerberosShortNamer,
                                                                
SslPrincipalMapper sslPrincipalMapper) {
         Class<?> principalBuilderClass = (Class<?>) 
configs.get(BrokerSecurityConfigs.PRINCIPAL_BUILDER_CLASS_CONFIG);
-        final KafkaPrincipalBuilder builder;
+        KafkaPrincipalBuilder builder;
 
         if (principalBuilderClass == null || principalBuilderClass == 
DefaultKafkaPrincipalBuilder.class) {
             builder = new DefaultKafkaPrincipalBuilder(kerberosShortNamer, 
sslPrincipalMapper);
         } else if 
(KafkaPrincipalBuilder.class.isAssignableFrom(principalBuilderClass)) {
-            builder = (KafkaPrincipalBuilder) 
Utils.newInstance(principalBuilderClass);
+            try {
+                Constructor<?> constructor = 
principalBuilderClass.getConstructor(KerberosShortNamer.class, 
SslPrincipalMapper.class);
+                builder = (KafkaPrincipalBuilder) 
constructor.newInstance(kerberosShortNamer, sslPrincipalMapper);

Review Comment:
   Thanks for the changes. LGTM.



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