jquery - Non-deterministic parsererror -

i encountered weird error doing short-polling ajax()-request play2.1-server.

currently using rest send request server , await json answer. server response correct jsonp after short time client gets "parsererror" , stops calling ajax-callbackmethod following requests.

the client:

   function restget(url, callback) {        $.ajax({           type: 'get',           url: 'www. ... /getquestions/42',           datatype: 'jsonp',           jsonpcallback: 'callbackmethod',           success: 'callbackmethod',           error: function (jqxhr, status, exception) {               console.log('jqxhr: ' + json.stringify(jqxhr));               console.log('restget error: ' + status + ' - ' + exception);           }       });    }     function callbackmethod(response) {        console.log('at callbackmethod(' + json.stringify(response) + ')');    } 

the server:

    public static result getquestions(string lectureid) {         string callbackmethod = request().getquerystring("callback");         string json = "{\"question\":\"do find error?\"}";         return ok((callback == null)?json:callback + "("+ json + ")");     } 

according fiddler web debugger server sends same (and correct) jsonp-string. , restget-method client called every second.

the client prints out following crashes:

[17:46:24.036] jqxhr: {"readystate":4,"status":200,"statustext":"success"}  [17:46:24.036] restget error: parsererror - error: callbackmethod not called 

i don't know what's wrong code , other posts found parsererror said have use jsonp instead of json. that's did, didn't i?

function names should not quoted.

   function restget(url, callback) {        $.ajax({           type: 'get',           url: 'www. ... /getquestions/42',           datatype: 'jsonp',           jsonpcallback: 'callbackmethod',           success: callbackmethod,           error: function (jqxhr, status, exception) {               console.log('jqxhr: ' + json.stringify(jqxhr));               console.log('restget error: ' + status + ' - ' + exception);           }       });    }