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https://issues.apache.org/jira/browse/YARN-2527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128622#comment-14128622
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Benoy Antony commented on YARN-2527:
------------------------------------

Thank you [~zjshen].
I am investigating on how that happened and will probably open another jira 
with the root cause. 
But I believe, the NullPointer issue in _ApplicationACLsManager_ should be 
fixed regardless of that. Based on the current logic, Admin and application 
owner should be able to perform actions on the Application regardless of ACLS. 
The NullPointer issue prevents it.

> NPE in ApplicationACLsManager
> -----------------------------
>
>                 Key: YARN-2527
>                 URL: https://issues.apache.org/jira/browse/YARN-2527
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.5.0
>            Reporter: Benoy Antony
>            Assignee: Benoy Antony
>         Attachments: YARN-2527.patch
>
>
> NPE in _ApplicationACLsManager_ can result in 500 Internal Server Error.
> The relevant stacktrace snippet from the ResourceManager logs is as below
> {code}
> Caused by: java.lang.NullPointerException
>         at 
> org.apache.hadoop.yarn.server.security.ApplicationACLsManager.checkAccess(ApplicationACLsManager.java:104)
>         at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.AppBlock.render(AppBlock.java:101)
>         at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66)
>         at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76)
>         at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
> {code}
> This issue was reported by [~miguenther].



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