[jira] [Created] (KAFKA-3589) KTable.count(final KeyValueMapper selector, String name) throw NPE

[Damian Guy (JIRA)]

Damian Guy created KAFKA-3589:
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             Summary: KTable.count(final KeyValueMapper<K, V, K1> selector, 
String name) throw NPE
                 Key: KAFKA-3589
                 URL: https://issues.apache.org/jira/browse/KAFKA-3589
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.10.0.0
            Reporter: Damian Guy
            Assignee: Guozhang Wang


The implementation of KTable.count(inal KeyValueMapper<K, V, K1> selector, 
String name) passes null through as the parameters for the key and value 
serdes. This results in an NPE in the aggregate method when it does:

ChangedSerializer<V1> changedValueSerializer = new 
ChangedSerializer<>(valueSerde.serializer());



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