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https://issues.apache.org/jira/browse/KAFKA-5205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16003245#comment-16003245
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Kyle Winkelman commented on KAFKA-5205:
---------------------------------------
I have already made a PR but originally named it minor. I have now opened a
Jira to get this bug more visibility. https://github.com/apache/kafka/pull/2963
> CachingSessionStore doesn't use the default keySerde.
> -----------------------------------------------------
>
> Key: KAFKA-5205
> URL: https://issues.apache.org/jira/browse/KAFKA-5205
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Kyle Winkelman
> Assignee: Kyle Winkelman
>
> CachingSessionStore wasn't properly using the default keySerde if no Serde
> was supplied. I saw the below error in the logs for one of my test cases.
> ERROR stream-thread
> [cogroup-integration-test-3-5570fe48-d2a3-4271-80b1-81962295553d-StreamThread-6]
> Streams application error during processing:
> (org.apache.kafka.streams.processor.internals.StreamThread:335)
> java.lang.NullPointerException
> at
> org.apache.kafka.streams.state.internals.CachingSessionStore.findSessions(CachingSessionStore.java:93)
> at
> org.apache.kafka.streams.kstream.internals.KStreamSessionWindowAggregate$KStreamSessionWindowAggregateProcessor.process(KStreamSessionWindowAggregate.java:94)
> at
> org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:47)
> at
> org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:187)
> at
> org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:133)
> at
> org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:82)
> at
> org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:69)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:206)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.processAndPunctuate(StreamThread.java:657)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:728)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:327)
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