Rest Easy, How to accept XML / JSON requests as Source document object in post method

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What I am trying to do is, if client is sending JSON or XML in post, it should be rendered as Source document parameter?

    @POST
        Response doPost(Source source){
    }

Any Idea. I tried looking at MessageBodyReader / Writer some Interception methods but nothing seems to be working, and I believe MessageBodyReader are not longer supported in 3.0.10 Resteasy.