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https://issues.apache.org/jira/browse/FLINK-6001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925861#comment-15925861
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Vladislav Pernin commented on FLINK-6001:
-----------------------------------------
Very nice, it works.
I was reluctant to push a PR myself with your NPE protection without being
aware of possible side effects.
> NPE on TumblingEventTimeWindows with ContinuousEventTimeTrigger and
> allowedLateness
> -----------------------------------------------------------------------------------
>
> Key: FLINK-6001
> URL: https://issues.apache.org/jira/browse/FLINK-6001
> Project: Flink
> Issue Type: Bug
> Components: DataStream API, Streaming
> Affects Versions: 1.2.0
> Reporter: Vladislav Pernin
> Priority: Critical
>
> I try to isolate the problem in a small and simple reproducer by extracting
> the data from my real setup.
> I fails with NPE at :
> {noformat}
> java.lang.NullPointerException: null
> at
> org.apache.flink.streaming.api.windowing.triggers.ContinuousEventTimeTrigger.onEventTime(ContinuousEventTimeTrigger.java:81)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$Context.onEventTime(WindowOperator.java:721)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.onEventTime(WindowOperator.java:425)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.api.operators.HeapInternalTimerService.advanceWatermark(HeapInternalTimerService.java:276)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:858)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:168)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:63)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:272)
> ~[flink-streaming-java_2.11-1.2.0.jar:1.2.0]
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
> ~[flink-runtime_2.11-1.2.0.jar:1.2.0]
> at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_121]
> {noformat}
> It fails only with the Thread.sleep. If you uncomment it, it won't fail.
> So, you may have to increase the sleep time depending of your environment.
> I know this is not a very rigourous test, but this is the only way I've found
> to reproduce it.
> You can find the reproducer here :
> https://github.com/vpernin/flink-window-npe
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