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https://issues.apache.org/jira/browse/FLINK-7674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184118#comment-16184118
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ASF GitHub Bot commented on FLINK-7674:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/4711
> NullPointerException in ContinuousFileMonitoringFunction close
> --------------------------------------------------------------
>
> Key: FLINK-7674
> URL: https://issues.apache.org/jira/browse/FLINK-7674
> Project: Flink
> Issue Type: Bug
> Components: Streaming Connectors
> Affects Versions: 1.4.0
> Reporter: Ufuk Celebi
> Assignee: Bowen Li
> Priority: Minor
> Fix For: 1.4.0
>
>
> If the ContinuousFileMonitoringFunction is closed before run is called
> (because initialization fails), we get a NullPointerException, because
> checkpointLock has not been set.
> {code}
> synchronized (checkpointLock) {
> globalModificationTime = Long.MAX_VALUE;
> isRunning = false;
> }
> {code}
> This results in a follow up error log:
> {code}
> 2017-09-23 10:25:04,096 ERROR
> org.apache.flink.streaming.runtime.tasks.StreamTask - Error during
> disposal of stream operator.
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.api.functions.source.ContinuousFileMonitoringFunction.close(ContinuousFileMonitoringFunction.java:337)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.closeFunction(FunctionUtils.java:43)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.dispose(AbstractUdfStreamOperator.java:126)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.disposeAllOperators(StreamTask.java:429)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:334)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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