jlprat commented on code in PR #15274:
URL: https://github.com/apache/kafka/pull/15274#discussion_r1487661551


##########
tools/src/main/java/org/apache/kafka/tools/consumer/ConsoleConsumerOptions.java:
##########
@@ -238,7 +237,8 @@ private Set<String> checkConsumerGroup(Properties 
consumerPropsFromFile, Propert
     }
 
     private Properties buildConsumerProps(Properties consumerPropsFromFile, 
Properties extraConsumerProps, Set<String> groupIdsProvided) {
-        Properties consumerProps = new Properties(consumerPropsFromFile);
+        Properties consumerProps = new Properties();
+        consumerProps.putAll(consumerPropsFromFile);

Review Comment:
   Strange that this change is not doing the exact same thing. But reading the 
API, constructor with `Property` says that it creates an empty list with the 
passed properties as defaults. Tricky API design from Java's part...



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