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https://issues.apache.org/jira/browse/YARN-8022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395060#comment-16395060
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Tarun Parimi commented on YARN-8022:
------------------------------------

Thanks for the clarification [~rohithsharma] . Attached a patch as per your 
suggestions

> ResourceManager UI cluster/app/<app-id> page fails to render
> ------------------------------------------------------------
>
>                 Key: YARN-8022
>                 URL: https://issues.apache.org/jira/browse/YARN-8022
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: webapp
>            Reporter: Tarun Parimi
>            Assignee: Tarun Parimi
>            Priority: Blocker
>         Attachments: Screen Shot 2018-03-12 at 1.45.05 PM.png, 
> YARN-8022.001.patch, YARN-8022.002.patch
>
>
> The page displays the message "Failed to read the attempts of the application"
>  
> The following stack trace is observed in RM log.
> org.apache.hadoop.yarn.server.webapp.AppBlock: Failed to read the attempts of 
> the application application_1520597233415_0002.
> java.lang.NullPointerException
>  at org.apache.hadoop.yarn.server.webapp.AppBlock$3.run(AppBlock.java:283)
>  at org.apache.hadoop.yarn.server.webapp.AppBlock$3.run(AppBlock.java:280)
>  at java.security.AccessController.doPrivileged(Native Method)
>  at javax.security.auth.Subject.doAs(Subject.java:422)
>  at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
>  at org.apache.hadoop.yarn.server.webapp.AppBlock.render(AppBlock.java:279)
>  at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RMAppBlock.render(RMAppBlock.java:71)
>  at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
>  at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
>  at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
>  at org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
>  at 
> org.apache.hadoop.yarn.webapp.hamlet2.HamletImpl$EImp._v(HamletImpl.java:117)
>  at org.apache.hadoop.yarn.webapp.hamlet2.Hamlet$TD.__(Hamlet.java:848)
>  at 
> org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:71)
>  at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
>  at org.apache.hadoop.yarn.webapp.Controller.render(Controller.java:212)
>  at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RmController.app(RmController.java:54)



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