GitHub user Ethanlm opened a pull request:

    https://github.com/apache/storm/pull/2819

    [STORM-3213] fix server error on system component page on storm UI

    Fix
    
    ```
    2018-09-05 16:15:24.927 o.a.s.t.ProcessFunction pool-21-thread-55 [ERROR] 
Internal error processing getComponentPageInfo
    java.lang.RuntimeException: java.lang.NullPointerException
            at 
org.apache.storm.daemon.nimbus.Nimbus.getComponentPageInfo(Nimbus.java:4238) 
~[storm-server-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.generated.Nimbus$Processor$getComponentPageInfo.getResult(Nimbus.java:4577)
 ~[storm-client-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.generated.Nimbus$Processor$getComponentPageInfo.getResult(Nimbus.java:4556)
 ~[storm-client-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.thrift.ProcessFunction.process(ProcessFunction.java:38) 
[shaded-deps-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.thrift.TBaseProcessor.process(TBaseProcessor.java:39) 
[shaded-deps-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.security.auth.SimpleTransportPlugin$SimpleWrapProcessor.process(SimpleTransportPlugin.java:169)
 [storm-client-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.thrift.server.AbstractNonblockingServer$FrameBuffer.invoke(AbstractNonblockingServer.java:518)
 [shaded-deps-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.thrift.server.Invocation.run(Invocation.java:18) 
[shaded-deps-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[?:1.8.0_131]
            at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[?:1.8.0_131]
            at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
    Caused by: java.lang.NullPointerException
            at 
org.apache.storm.scheduler.resource.ResourceUtils.getBoltResources(ResourceUtils.java:37)
 ~[storm-server-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            at 
org.apache.storm.daemon.nimbus.Nimbus.getComponentPageInfo(Nimbus.java:4192) 
~[storm-server-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
            ... 10 more
    ```

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/Ethanlm/storm STORM-3213

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/storm/pull/2819.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2819
    
----
commit 26a6c878ce368ddba026a2977f484523a70f3d56
Author: Ethan Li <ethanopensource@...>
Date:   2018-09-05T19:31:07Z

    [STORM-3213] fix server error on system component page on storm UI

----


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