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https://issues.apache.org/jira/browse/KAFKA-3142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang updated KAFKA-3142:
---------------------------------
Issue Type: Sub-task (was: Improvement)
Parent: KAFKA-2590
> Improve error message in kstreams
> ---------------------------------
>
> Key: KAFKA-3142
> URL: https://issues.apache.org/jira/browse/KAFKA-3142
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jay Kreps
>
> If you have a bug in your kstream code the error message could be slightly
> better.
> 1. Not sure what the second error about it already being closed is.
> 2. I recommend we avoid wrapping the exception (at least for runtime
> exceptions) so it is more clear to the user that the error is coming from
> their code not ours.
> {code}
> [2016-01-23 14:40:59,776] ERROR Uncaught error during processing in thread
> [StreamThread-1]:
> (org.apache.kafka.streams.processor.internals.StreamThread:222)
> org.apache.kafka.common.KafkaException: java.lang.NullPointerException
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:327)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:220)
> Caused by: java.lang.NullPointerException
> at TestKstreamsApi.lambda$0(TestKstreamsApi.java:27)
> at
> org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
> at
> org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:68)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.forward(StreamTask.java:324)
> at
> org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:175)
> at
> org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:56)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:170)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:310)
> ... 1 more
> [2016-01-23 14:40:59,803] ERROR Failed to close a StreamTask #0_0 in thread
> [StreamThread-1]:
> (org.apache.kafka.streams.processor.internals.StreamThread:586)
> java.lang.IllegalStateException: This consumer has already been closed.
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.ensureNotClosed(KafkaConsumer.java:1281)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.acquire(KafkaConsumer.java:1292)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.assign(KafkaConsumer.java:779)
> at
> org.apache.kafka.streams.processor.internals.ProcessorStateManager.close(ProcessorStateManager.java:339)
> at
> org.apache.kafka.streams.processor.internals.AbstractTask.close(AbstractTask.java:95)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.close(StreamTask.java:306)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.closeOne(StreamThread.java:584)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.removeStreamTasks(StreamThread.java:571)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.shutdown(StreamThread.java:265)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:225)
> {code}
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