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https://issues.apache.org/jira/browse/KAFKA-4324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592588#comment-15592588
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Guozhang Wang edited comment on KAFKA-4324 at 10/20/16 6:28 PM:
----------------------------------------------------------------
Thanks for the report [~markshelton], could you share your topology code (of
course omit any unnecessary processing logic) so I can help looking into it?
Looking at {{StreamTask.java:341}} it seems that the {{MyProcessor}} do not
have the right children processor to forward to, and it will be great to see
the topologyBuilder code to investigate more.
was (Author: guozhang):
Thanks for the report [~markshelton], could you share your topology code (of
course omit any unnecessary processing logic) so I can help looking into it?
Looking at {StreamTask.java:341} it seems that the {MyProcessor} do not have
the right children processor to forward to, and it will be great to see the
topologyBuilder code to investigate more.
> 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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