Parameter matching does not recognise primitives

[grover-ws-2]

Given the following annotated method:

    @GET
    @Path("/mystuff/{id}")
    public Response doMyStuff(@PathParam("id") int id) {
        ...
    }

.. a call to /mystuff/1 will not match successfully. Changing the int id to Integer id causes the method to match, but is very unobvious. I assume that is also the case with the other Parameter types (Header etc..)