[jira] [Created] (KAFKA-4324) NullPointerException in StreamTask.forward

[Mark Shelton (JIRA)]

Mark Shelton created KAFKA-4324:
-----------------------------------

             Summary: NullPointerException in StreamTask.forward
                 Key: KAFKA-4324
                 URL: https://issues.apache.org/jira/browse/KAFKA-4324
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 0.10.0.1
            Reporter: Mark Shelton
            Assignee: Guozhang Wang
            Priority: Minor


I have a custom processor "MyProcessor extends AbstractProcessor<String, 
Object>". The processor receives a message and transforms it and calls 
"context.forward". This sometimes results in below exception. It seems to occur 
when there are multiple messages available for processing.

Stack trace:

java.lang.NullPointerException
        at 
org.apache.kafka.streams.processor.internals.StreamTask.forward(StreamTask.java:341)
        at 
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:187)
        at xx.xx.xx.xx.xx.xx.xx.lambda$xx$1(xx.java:63)
        ....
        at xx.xx.xx.xx.xx.process(MyProcessor.java:16)
        at 
org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:68)
        at 
org.apache.kafka.streams.processor.internals.StreamTask.forward(StreamTask.java:343)
        at 
org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:187)
        at 
org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:64)
        at 
org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:174)
        at 
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:320)
        at 
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:218)




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