Zeng, Bryant created EAGLE-614:
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             Summary: NPE Exception in DynamicPolicyLoader
                 Key: EAGLE-614
                 URL: https://issues.apache.org/jira/browse/EAGLE-614
             Project: Eagle
          Issue Type: Bug
            Reporter: Zeng, Bryant
            Assignee: Zeng, Bryant


Find exception as below:
INFO  [2016-10-13 01:15:02,965] 
org.apache.eagle.alert.coordinator.trigger.DynamicPolicyLoader: policies loader 
start.
INFO  [2016-10-13 01:15:02,966] 
org.apache.eagle.alert.service.MetadataServiceClientImpl: query URL 
http://localhost:8080/rest/metadata/policies
ERROR [2016-10-13 01:15:02,972] 
org.apache.eagle.alert.coordinator.trigger.DynamicPolicyLoader: error loading 
policy, but continue to run
! java.lang.NullPointerException: null
! at 
org.apache.eagle.alert.engine.coordinator.PolicyDefinition.equals(PolicyDefinition.java:150)
 ~[alert-service-0.5.0-incubating-SNAPSHOT-shaded.jar
:0.5.0-incubating-SNAPSHOT]
! at 
org.apache.eagle.alert.coordinator.trigger.DynamicPolicyLoader.run(DynamicPolicyLoader.java:69)
 ~[alert-service-0.5.0-incubating-SNAPSHOT-shaded.
jar:0.5.0-incubating-SNAPSHOT]
! at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[na:1.8.0_102]
! at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
[na:1.8.0_102]
! at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 [na:1.8.0_102]
! at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 [na:1.8.0_102]
! at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[na:1.8.0_102]
! at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[na:1.8.0_102]
! at java.lang.Thread.run(Thread.java:745) [na:1.8.0_102]

we have compare null with other object which should be avoided.



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