chia7712 commented on a change in pull request #8605:
URL: https://github.com/apache/kafka/pull/8605#discussion_r419105803



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java
##########
@@ -310,21 +310,31 @@ public KafkaProducer(Properties properties) {
      *                         be called in the producer when the serializer 
is passed in directly.
      */
     public KafkaProducer(Properties properties, Serializer<K> keySerializer, 
Serializer<V> valueSerializer) {
-        this(propsToMap(properties), keySerializer, valueSerializer, null, 
null, null,
+        this(new 
ProducerConfig(ProducerConfig.addSerializerToConfig(properties, keySerializer, 
valueSerializer)), keySerializer,
+                valueSerializer, null, null, null,
                 Time.SYSTEM);
     }
 
     // visible for testing
-    @SuppressWarnings("unchecked")
     KafkaProducer(Map<String, Object> configs,

Review comment:
       this constructor is used by KafkaProducerTest only. I keep this method 
to minimize this PR 




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