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https://issues.apache.org/jira/browse/OOZIE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15133795#comment-15133795
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Ming Hsuan Tu commented on OOZIE-2451:
--------------------------------------

Some people have this problem too.
http://community.cloudera.com/t5/Batch-Processing-and-Workflow/OOzie-email-action-throwing-NullPointerException-null/td-p/36566

> Oozie mail action fails due to the Null pointer exception
> ---------------------------------------------------------
>
>                 Key: OOZIE-2451
>                 URL: https://issues.apache.org/jira/browse/OOZIE-2451
>             Project: Oozie
>          Issue Type: Bug
>          Components: action, core, workflow
>    Affects Versions: 4.1.0
>         Environment: CDH 5.5.1
>            Reporter: Ming Hsuan Tu
>
> The workflow is as follows
> {code:xml}
> <action name="send_email">
>           <email xmlns="uri:oozie:email-action:0.1">
>               <to>[email protected]</to>
>               <subject>${app_name} in ${date} failed</subject>
>               <body>The workflow ${wf:id()} had issues and was killed.</body>
>           </email>
>           <ok to="fail"/>
>           <error to="fail"/>
>   </action>
> {code}
> but the mail action just threw up the NULL pointer exception and no other 
> logs can be found.
> I have configured the smtp server correctly.
> This issues occurred when I upgrade to CDH 5.5.1 from CDH 5.4.6.
> Thank you. 



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