Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/9615#issuecomment-155678946
  
    Another thing to keep in mind, given the recent issues with 
`@VisibleForTesting`: JAX-RS APIs use lots of annotations, and if you shade 
them, that is likely to cause problems with scalac-generated code (see #9585).
    
    The good news is that since new versions of these APIs are backwards 
compatible, you shouldn't need to shade the `javax.rs` stuff at all; someone 
who wants to override them just needs to put the newer version in front of 
Spark's classpath. It's not as easy as including it in your application, but 
it's doable.
    
    Given that, I wonder if it's even necessary to shade jersey at all; the 
version of jersey used in Spark is old and doesn't clash with the new package 
name used by newer releases of Jersey.


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