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From Gino Bustelo <>
Subject Re: ExceptionMapper and Media Types
Date Fri, 19 Aug 2011 22:50:03 GMT
I actually got a nice solution to the problem. The main issue was that the wink jackson provider
is not checking if response entities are asset classes. An asset class should not be handled
by the jackson provider, rather let the asset provider call the right method based on media

I had to replace the Jackson provider with one that checks if a type has an asset annotation.

Here is the setup. 
Custom exceptions
Custom exception mapper
Wrap exception in an asset class and set as response entity
Have the right media type produces annotation in the asset class methods. 
Done... Right rendering of exception according to type. 

Gino B.

On Aug 19, 2011, at 8:03 AM, Paulo Borges <> wrote:

> This may seem like an over kill but here is how I do it.
>  I have a String instance variable in my Exception classes with default set to Media
type json and before I throw the exception I set the value to the appropriate media type [if
not JSON]  and in my Exception Mapper the Response object uses the media type set for the
> CC:
> From:
> Subject: Re: ExceptionMapper and Media Types
> Date: Thu, 18 Aug 2011 12:20:06 -0500
> To:
> Thanks Michael... That is actually what I started doing today. Still not working. Tracing
to the code and so far it seems there is something wrong picking the right produces method
in the entity I'm returning. Also, I had to set the type on the response in the mapper. It
just seem that winks forgets about media type when exception handling. 
> Gino B.
> On Aug 18, 2011, at 9:41 AM, Michael Elman <> wrote:
> Why do you need a pair of ExceptionMappers?
> ExceptionMapper returns Response, which can contain an entity.
> The entity will be serialized based on the Accept header.
> On Thu, Aug 18, 2011 at 5:24 PM, Gino Bustelo <> wrote:
> I'm looking for a way to control the rendering of an exception based
> on the media type. Basically, the same exception can yield an HTML
> payload or a JSON structure based on Accept header. I tried to achieve
> this with a pair of ExceptionMapper subclasses and the @Produces
> annotation. The json mapper is getting call all the times. What am I
> doing wrong? I'm think that I'm left with looking at the accept header
> in the mapper an producing the different response entities.

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