[jira] [Created] (KAFKA-12861) MockProducer raises NPE when no Serializer

[Jira]

Gérald Quintana created KAFKA-12861:
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             Summary: MockProducer raises NPE when no Serializer
                 Key: KAFKA-12861
                 URL: https://issues.apache.org/jira/browse/KAFKA-12861
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 2.7.1, 2.8.0, 2.7.0
            Reporter: Gérald Quintana


Since KAFKA-10503, the MockProducer may raise NullPointerException when 
key/value serializers are not set:
*15:58:16*  java.lang.NullPointerException: null*15:58:16*      at 
org.apache.kafka.clients.producer.MockProducer.send(MockProducer.java:307)
This occurs when using MockProducer default constructor:
{code:java}
public MockProducer() {
 this(Cluster.empty(), false, null, null, null);
}{code}
The problem didn't occur on Kafka Client 2.6.

I understand this constructor is only for metadata as described in JavaDoc. 
However defaulting to a Noop serializer (MockSerializer) would be a better 
default. Removing the default constructor to force declaring a serialiszer 
could also be a solution.



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