I wrote my own XYZException mapper.  It returns different Responses
regarding on its own decision. That works well.
 
But in some cases, the XYZException is just a wrapper around another
(unkown) exception, found in e.getCause().
 
I'd like Jersey to check whether there is an exception mapper for the
cause.
 
How can this be done?
 
Thanks!
Markus