[ 
https://issues.apache.org/jira/browse/STORM-1273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15130438#comment-15130438
 ] 

ASF GitHub Bot commented on STORM-1273:
---------------------------------------

Github user revans2 commented on the pull request:

    https://github.com/apache/storm/pull/1071#issuecomment-179258530
  
    The travis CI tests failed with
    
    ```
    13881 [timer] ERROR o.a.s.d.nimbus - Error when processing event
    java.lang.NullPointerException
        at 
org.apache.storm.cluster.Cluster.convertExecutorBeats(Cluster.java:202) 
~[classes/:?]
        at 
org.apache.storm.cluster.StormZkClusterState.executorBeats(StormZkClusterState.java:327)
 ~[classes/:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:1.7.0_76]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
~[?:1.7.0_76]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.7.0_76]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_76]
        at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93) 
~[clojure-1.7.0.jar:?]
        at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28) 
~[clojure-1.7.0.jar:?]
        at 
org.apache.storm.daemon.nimbus$update_heartbeats_BANG_.invoke(nimbus.clj:589) 
~[classes/:?]
    ```


> port backtype.storm.cluster to java
> -----------------------------------
>
>                 Key: STORM-1273
>                 URL: https://issues.apache.org/jira/browse/STORM-1273
>             Project: Apache Storm
>          Issue Type: New Feature
>          Components: storm-core
>            Reporter: Robert Joseph Evans
>            Assignee: Basti Liu
>              Labels: java-migration, jstorm-merger
>
> current state of the cluster (Some of this moves to java as a part of 
> heartbeat server)
> https://github.com/apache/storm/tree/jstorm-import/jstorm-core/src/main/java/com/alibaba/jstorm/cluster
>  as an example



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