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https://issues.apache.org/jira/browse/FLINK-8830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389237#comment-16389237
 ] 

ASF GitHub Bot commented on FLINK-8830:
---------------------------------------

Github user yanghua commented on the issue:

    https://github.com/apache/flink/pull/5629
  
    @zentol Could you please review this PR? 


> YarnResourceManager throws NullPointerException
> -----------------------------------------------
>
>                 Key: FLINK-8830
>                 URL: https://issues.apache.org/jira/browse/FLINK-8830
>             Project: Flink
>          Issue Type: Bug
>          Components: YARN
>    Affects Versions: 1.5.0
>            Reporter: Piotr Nowojski
>            Assignee: vinoyang
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
>  
> {code:java}
> java.lang.NullPointerException
> at java.io.File.<init>(File.java:277)
> at org.apache.flink.yarn.Utils.createTaskExecutorContext(Utils.java:502)
> at 
> org.apache.flink.yarn.YarnResourceManager.createTaskExecutorLaunchContext(YarnResourceManager.java:445)
> at 
> org.apache.flink.yarn.YarnResourceManager.onContainersAllocated(YarnResourceManager.java:338)
> at 
> org.apache.flink.yarn.YarnResourceManagerTest$1.<init>(YarnResourceManagerTest.java:340)
> at 
> org.apache.flink.yarn.YarnResourceManagerTest.testStopWorker(YarnResourceManagerTest.java:317)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at 
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at 
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
> at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
> at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
> at 
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
> at 
> com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
> at 
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
> at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> {code}
>  
> This exception is being thrown in 
> `org.apache.flink.yarn.YarnResourceManagerTest#testStopWorker`. Exception 
> apparently is being ignored, since the test completes. It seems like this 
> line:
> {code:java}
> String fileLocation = 
> System.getenv(UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION){code}
> Is not guarded against returned null value. I don't know if that's a test or 
> production code issue.
> CC [~till.rohrmann]



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