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https://issues.apache.org/jira/browse/FLUME-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257179#comment-13257179
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Brock Noland commented on FLUME-1131:
-------------------------------------
This problem is actually all over ChannelProcessor.
> ChannelProcessor needs to check for null before calling rollback
> ----------------------------------------------------------------
>
> Key: FLUME-1131
> URL: https://issues.apache.org/jira/browse/FLUME-1131
> Project: Flume
> Issue Type: Bug
> Affects Versions: v1.1.0
> Reporter: Brock Noland
>
> If an Exception is thrown in ChannelProcessor.processEvent whilst getting an
> exception, tx will be null and when rollback is called on tx, an NPE will be
> thrown.
> {noformat}
> 12/04/18 19:03:17 ERROR source.PollableSourceRunner: Unhandled exception,
> logging and sleeping for 5000ms
> java.lang.NullPointerException
> at
> org.apache.flume.channel.ChannelProcessor.processEvent(ChannelProcessor.java:183)
> at
> org.apache.flume.source.SequenceGeneratorSource.process(SequenceGeneratorSource.java:48)
> at
> org.apache.flume.source.PollableSourceRunner$PollingRunner.run(PollableSourceRunner.java:131)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
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