Allen Wittenauer reopened HADOOP-13669:

bq. Findbugs warnings are false alarm, since the exception is thrown.


bq. Committed this to trunk, branch-2 and branch-2.8.

Re-opening, because this patch needs an addendum. Please don't commit patches 
that throw findbugs errors.

If you are sure this is a false alarm, an exception must get added to 
findbugs-exclude.xml.  Until that happens, the release, the nightlies, and all 
other patches against hadoop-kms are going to fail.  

> KMS Server should log exceptions before throwing
> ------------------------------------------------
>                 Key: HADOOP-13669
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13669
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: kms
>            Reporter: Xiao Chen
>            Assignee: Suraj Acharya
>              Labels: supportability
>             Fix For: 2.8.0, 3.0.0-alpha2
>         Attachments: HADOOP-13369.2.patch, HADOOP-13369.patch, 
> HADOOP-13369.patch.1
> In some recent investigation, it turns out when KMS throws an exception (into 
> tomcat), it's not logged anywhere and we can only see the exception message 
> from client-side, but not the stacktrace. Logging the stacktrance would help 
> debugging.

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