JSR-311 and JAXB and JSON

[Doug]

Hi,
I am trying to set up a JSR-311 REST "like" service and POSTing a string 
of JSON  to my /service/init/{id} address. The server seems to recognise 
the address because catalina.out reports:

Mar 18, 2008 11:11:37 AM org.apache.cxf.jaxrs.interceptor.JAXRSInInterceptor 
handleMessage
INFO: Found operation: init

The problem is that my init service function is never actually called. I 
figure that something is going wrong with the JAXB? interpretation of my JSON
data. Is there some way to switch on debugging of this process to see 
what is or isn't going on?
After the above server message my client connection eventually 
just times out.

I am just assuming that consuming application/json works ...?
        @POST
        @Path("init/{clientId}")
        @ProduceMime("text/plain")
        @ConsumeMime("application/json")
        public String init(@UriParam("clientId") String id, @HttpContext 
UriInfo 
info, CrystalParameters cp) {
                System.out.println("-----------received the sucker!----------");
                MultivaluedMap params  = info.getQueryParameters();
                // nothing happening here yet ...
                
                String url = "/ReflnCover/" + id + "/basic";
                return url;
        }

Thanks
Doug

P.S. I'm using apache-cxf-2.1-incubator-20080306.021818-37.zip under 
apache-tomcat-5.5.20 on kubuntu.