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https://issues.apache.org/jira/browse/FLINK-21278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279282#comment-17279282
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HunterHunter commented on FLINK-21278:
--------------------------------------
[~ZhaoWeiNan]
code： [https://paste.ubuntu.com/p/wJyN93BwHB/]
{code:java}
Caused by: java.lang.NullPointerException
at
org.apache.flink.api.common.functions.util.PrintSinkOutputWriter.write(PrintSinkOutputWriter.java:73)
at
org.apache.flink.streaming.api.functions.sink.PrintSinkFunction.invoke(PrintSinkFunction.java:81)
at
org.apache.flink.streaming.api.functions.sink.SinkFunction.invoke(SinkFunction.java:52)
at
org.apache.flink.streaming.api.operators.StreamSink.processElement(StreamSink.java:56)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:71)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:46)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:26)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:52)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:30)
at
org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:53)
at
org.apache.flink.streaming.api.functions.windowing.PassThroughWindowFunction.apply(PassThroughWindowFunction.java:36)
at
org.apache.flink.streaming.api.functions.windowing.ReduceApplyWindowFunction.apply(ReduceApplyWindowFunction.java:58)
at
org.apache.flink.streaming.runtime.operators.windowing.functions.InternalIterableWindowFunction.process(InternalIterableWindowFunction.java:44)
at
org.apache.flink.streaming.runtime.operators.windowing.functions.InternalIterableWindowFunction.process(InternalIterableWindowFunction.java:32)
at
org.apache.flink.streaming.runtime.operators.windowing.EvictingWindowOperator.emitWindowContents(EvictingWindowOperator.java:359)
at
org.apache.flink.streaming.runtime.operators.windowing.EvictingWindowOperator.onEventTime(EvictingWindowOperator.java:271)
at
org.apache.flink.streaming.api.operators.InternalTimerServiceImpl.advanceWatermark(InternalTimerServiceImpl.java:276)
at
org.apache.flink.streaming.api.operators.InternalTimeServiceManagerImpl.advanceWatermark(InternalTimeServiceManagerImpl.java:183)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:600)
at
org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitWatermark(OneInputStreamTask.java:199)
at
org.apache.flink.streaming.runtime.streamstatus.StatusWatermarkValve.findAndOutputNewMinWatermarkAcrossAlignedChannels(StatusWatermarkValve.java:173)
at
org.apache.flink.streaming.runtime.streamstatus.StatusWatermarkValve.inputWatermark(StatusWatermarkValve.java:95)
at
org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:181)
at
org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:152)
at
org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:67)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:372)
at
org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:575)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:539)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
at java.lang.Thread.run(Thread.java:748){code}
> NullpointExecption error is reported when using the evictor method to filter
> the data before the window calculation
> -------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-21278
> URL: https://issues.apache.org/jira/browse/FLINK-21278
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.12.1
> Reporter: HunterHunter
> Priority: Blocker
>
> When I use evictor() method to filter the data before a window is triggered,
> if there is no data that meets the conditions, a nullpointExecption error
> will be reported.
> This problem occurs in the ReduceApplyWindowFunction.apply method.
> So I think if there is no data to calculate whether it can not trigger the
> calculation, or judge whether it is null before transmitting the calculation
> result
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