clolov commented on code in PR #12010:
URL: https://github.com/apache/kafka/pull/12010#discussion_r855727263


##########
clients/src/main/java/org/apache/kafka/clients/producer/ProducerConfig.java:
##########
@@ -542,8 +544,16 @@ static Map<String, Object> 
appendSerializerToConfig(Map<String, Object> configs,
         Map<String, Object> newConfigs = new HashMap<>(configs);
         if (keySerializer != null)
             newConfigs.put(KEY_SERIALIZER_CLASS_CONFIG, 
keySerializer.getClass());
+        else {
+            if (newConfigs.get(KEY_SERIALIZER_CLASS_CONFIG) == null)
+                throw new ConfigException(KEY_SERIALIZER_CLASS_CONFIG + " 
configuration for KafkaProducer must be non-null.");
+        }
         if (valueSerializer != null)
             newConfigs.put(VALUE_SERIALIZER_CLASS_CONFIG, 
valueSerializer.getClass());
+        else {
+            if (newConfigs.get(VALUE_SERIALIZER_CLASS_CONFIG) == null)

Review Comment:
   Oh, I see. So this check covers the situations a) the key is missing and b) 
the key is there and the value is null, while what I suggested would only cover 
a). Is there a possibility that you add a comment saying this above the line?



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