How to handle jQuery.ajax(..) JSON request ?

The following is the jQuery JSON request code

This section of code invokes a abstract behavior ona page with a json request:

console.log(" call back url :"+ callBackURL);               $.ajax({                    url: callBackURL,                    type: 'post',                    cache: false,                    data:JSON.stringify(ccbArry),                    contentType: 'application/json; charset=utf-8',                    dataType: 'json',                    success: function(json) {                        console.log(" reponse :"+ json);                    },                    error: function (XMLHttpRequest, textStatus, errorThrown) {                            console.log("error :"+XMLHttpRequest.responseText);                    }                                    });

This section of code is an abstract ajax behavior which accepts a json document in request and responds with another json document that is then available to the javascript method on the page.

        AbstractAjaxBehavior ajaxSaveBehaviour = new AbstractAjaxBehavior(){            private static final long serialVersionUID = 1L;            @SuppressWarnings("unchecked")            public void onRequest()            {                //get parameters                final RequestCycle requestCycle = RequestCycle.get();                WebRequest wr=(WebRequest)requestCycle.getRequest();                HttpServletRequest hsr= wr.getHttpServletRequest() ;                try {                    BufferedReader br = hsr.getReader();                                           String  jsonString = br.readLine();                           if((jsonString==null) || jsonString.isEmpty()){                               logger.error(" no json found");                           }                           else {                               logger.info(" json  is :"+ jsonString);                           }                                                            } catch (IOException ex) {                    logger.error(ex);                }                // json string to retir to the jQuery onSuccess function                String data=getReturnJSONValue();                logger.info("returning json :"+ data);                IRequestTarget t = new StringRequestTarget("application/json", "UTF-8", data);                getRequestCycle().setRequestTarget(t);                //requestCycle.setRequestTarget(new StringRequestTarget("application/json", "utf-8", data));            }        };        add(ajaxSaveBehaviour);               String callBackURL= ajaxSaveBehaviour.getCallbackUrl().toString();        logger.info(" callback url :"+ callBackURL);