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https://issues.apache.org/jira/browse/YARN-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14223734#comment-14223734
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Mit Desai commented on YARN-2900:
---------------------------------

bq. We can capture XXXXNotFoundException and convert it to 
webapp.NotFoundException
[~zjshen] How about we just return a null if the entity == null in 
ApplicationHistoryManagerOnTimelineStore? That way, when the call returns to 
WebServices, it will throw NotFoundException form its current implementation. 
This is the exact same approach that is used in the patch that I submitted 
earlier

> Application Not Found in AHS throws Internal Server Error with NPE
> ------------------------------------------------------------------
>
>                 Key: YARN-2900
>                 URL: https://issues.apache.org/jira/browse/YARN-2900
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jonathan Eagles
>            Assignee: Mit Desai
>         Attachments: YARN-2900.patch
>
>
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryManagerImpl.convertToApplicationReport(ApplicationHistoryManagerImpl.java:128)
>       at 
> org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryManagerImpl.getApplication(ApplicationHistoryManagerImpl.java:118)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices$2.run(WebServices.java:222)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices$2.run(WebServices.java:219)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1679)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices.getApp(WebServices.java:218)
>       ... 59 more



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