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https://issues.apache.org/jira/browse/FLINK-1951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529264#comment-14529264
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ASF GitHub Bot commented on FLINK-1951:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/641


> NullPointerException in DeltaIteration when no ForwardedFileds
> --------------------------------------------------------------
>
>                 Key: FLINK-1951
>                 URL: https://issues.apache.org/jira/browse/FLINK-1951
>             Project: Flink
>          Issue Type: Bug
>          Components: Iterations
>    Affects Versions: 0.9
>            Reporter: Vasia Kalavri
>            Assignee: Fabian Hueske
>            Priority: Critical
>
> The following exception is thrown by the Connected Components example, if the 
> @ForwardedFieldsFirst("*") annotation from the ComponentIdFilter join is 
> removed:
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.flink.examples.java.graph.ConnectedComponents$ComponentIdFilter.join(ConnectedComponents.java:186)
>       at 
> org.apache.flink.examples.java.graph.ConnectedComponents$ComponentIdFilter.join(ConnectedComponents.java:1)
>       at 
> org.apache.flink.runtime.operators.JoinWithSolutionSetSecondDriver.run(JoinWithSolutionSetSecondDriver.java:198)
>       at 
> org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:496)
>       at 
> org.apache.flink.runtime.iterative.task.AbstractIterativePactTask.run(AbstractIterativePactTask.java:139)
>       at 
> org.apache.flink.runtime.iterative.task.IterationIntermediatePactTask.run(IterationIntermediatePactTask.java:92)
>       at 
> org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:362)
>       at 
> org.apache.flink.runtime.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:217)
>       at java.lang.Thread.run(Thread.java:745)
> [Code | https://github.com/vasia/flink/tree/cc-test] and [dataset | 
> http://snap.stanford.edu/data/com-DBLP.html] to reproduce.



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