From: lasloo <lasloo_at_gmail.com>
Date: Mon, 9 May 2011 14:28:53 -0700 (PDT)

I think the answer you are looking for is registering a custom
WebApplicationException mapper...

@Provider
public class CustomWebApplicationExceptionMapper implements
ExceptionMapper<WebApplicationException>
{
    public Response toResponse(WebApplicationException ex)
    {
         if ( ex.cause() instanceOf java.lang.NumberFormatException )
         {
            return Response.status(400).entity("Should have used a
number!").build();
         }
         else { ... some default response instead .... }
     }
}

then in your spring bean file make sure to register it...
<jaxrs:server ..... >
     <jaxrs:provider>
          <ref bean="customWebApplicationExceptionMapper"/>
     </jaxrs:provider>
     ....
</jaxrs:server/>

<bean id="customWebApplicationExceptionMapper"
class="CustomWebApplicationExceptionMapper"/>

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