Media type negotiation unexpected behavior

	@Path("echo")
	public static class EchoResource {

		@Produces({ "*/xml" })
		@GET
		public Response echo(@QueryParam("msg") String msg) {
			Message message = new Message();
			message.setStatus(Status.OK.getStatusCode());
			message.setMessage(String.valueOf(msg));
			return Response.ok(message).build();
		}

	}

1. Not applicable in this case

2. P = {"*/xml"}

3. P is not empty so P = {"*/xml"}

4. A is not empty so A = {"application/*"}

5. MediaType.valueOf("application/*").isComptatible(MediaType.valueOf("*/xml")) returns true so M = {"application/*"} (the most specific).

6. M is not empty so lets jump to step 7

7. M.length = 1 so sort operation returns M = {"application/*"}

8. As M does not contain any concrete type the selected media type can not be determinated here. Go to step 9

9. M contains {"application/*"} so selected media type is Mselected = "application/octet-stream"

1. Not applicable in this case

2. Since we are dealing with a 404 there is no method and no class selected. So we have to select all *MessageBodyWriter * able to handle the Message entity.
 The  Resteasy JAXBXmlRootElementProvider should be selected among others since it is able to write the Message entity. So P will contains {...,"application/*+xml", "text/*+xml", ....}

3. P is not empty so P = {...,"application/*+xml", "text/*+xml", ....}

4. A is not empty so A = {"application/xml"}

5. MediaType.valueOf("application/xml").isComptatible(MediaType.valueOf("application/*+xml")) returns true so M = {"application/xml"} (the most specific).

6. M is not empty so lets jump to step 7

7.  M.length = 1 so sort operation returns M = {"application/xml"}

8. As M contains a concrete type the selected media type is Mselected = "application/xml". Finish so no need to process other steps