Steve Loughran resolved YARN-2974.
    Resolution: Won't Fix

Jersey error code doesn't provide accessors to the error strings, simply 
something static to log them through the java util logger :(

> GenericExceptionHandler to handle ErrorMessagesException by extracting 
> messages
> -------------------------------------------------------------------------------
>                 Key: YARN-2974
>                 URL: https://issues.apache.org/jira/browse/YARN-2974
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: webapp
>    Affects Versions: 2.6.0
>            Reporter: Steve Loughran
> The Jersey {{ErrorMessagesException}} supports a list of messages, and is how 
> jersey itself builds up errors. 
> {{GenericExceptionHandler }} doesn't have special handling here and converts 
> to a 500, discarding all the text as it does so.
> the handler should recognise the exception, log the messages and build up the 
> response text from it.

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