hachikuji commented on a change in pull request #11691:
URL: https://github.com/apache/kafka/pull/11691#discussion_r794736312



##########
File path: 
clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java
##########
@@ -226,6 +227,10 @@ public Password getPassword(String key) {
         return keys;
     }
 
+    public boolean originalsContainsKey(String configKey) {

Review comment:
       AbstractConfig is sadly a public class. Can we do the PR without this?

##########
File path: 
clients/src/main/java/org/apache/kafka/clients/producer/ProducerConfig.java
##########
@@ -514,11 +509,12 @@ public ProducerConfig(Map<String, Object> props) {
     }
 
     boolean idempotenceEnabled() {
-        boolean userConfiguredIdempotence = 
this.originals().containsKey(ENABLE_IDEMPOTENCE_CONFIG);
-        boolean userConfiguredTransactions = 
this.originals().containsKey(TRANSACTIONAL_ID_CONFIG);
-        boolean idempotenceEnabled = userConfiguredIdempotence && 
this.getBoolean(ENABLE_IDEMPOTENCE_CONFIG);
 
-        if (!idempotenceEnabled && userConfiguredIdempotence && 
userConfiguredTransactions)
+        boolean userConfiguredIdempotence = 
this.originalsContainsKey(ENABLE_IDEMPOTENCE_CONFIG);

Review comment:
       I think this can be simplified a little bit more by getting rid of this 
variable. How about this?
   ```java
   boolean userConfiguredTransactions = 
this.originalsContainsKey(TRANSACTIONAL_ID_CONFIG);
   boolean idempotenceEnabled = this.getBoolean(ENABLE_IDEMPOTENCE_CONFIG);
   if (!idempotenceEnabled && userConfiguredTransactions) {
     throw new ConfigException("Cannot set a " + 
ProducerConfig.TRANSACTIONAL_ID_CONFIG + " without also enabling idempotence.");
   }
   return idempotenceEnabled;
   




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