javascript - Android Post to API Doesn't Work, Ajax Post Works OK. Required String parameter 'firstname' is not present" -

i have spring framework api setup receive get/post request works fine on web when trying post android, "required string parameter 'firstname' not present".

i've tried post using different iterations continually same error.

java spring framework

    @requestmapping(value = "/adduser", method = requestmethod.post) public string adduser(@requestparam(value="firstname") string firstname,                       @requestparam(value="lastname") string lastname,                       @requestparam(value="username") string username,                       @requestparam(value="password") string password) throws exception {     string success = add.adduser(firstname, lastname, username, password);     return tojson(success); } 

javascript version

var data = {         firstname: firstname,         lastname: lastname,         username : username,         password : password     };     $.ajax({         type: 'post',         url: "<url removed>/import/adduser",         success: function(data) {             callbacksuccess(json.stringify(data));         },         error: function(data) {             callbackfail(data);         },         data: data,         datatype: "json"     }); 

android

        string url = "<url removed>/import/adduser";         inputstream inputstream = null;         string result = "";                 try {                     // 1. create httpclient                     httpclient httpclient = new defaulthttpclient();                      // 2. make post request given url                     httppost httppost = new httppost(url);                     string json = "";                     // 3. build jsonobject                     jsonobject jsonobject = new jsonobject();                     jsonobject.accumulate("firstname", userfirstname);                     jsonobject.accumulate("lastname", userlastname);                     jsonobject.accumulate("username", emailstr);                     jsonobject.accumulate("password", passwordstr);                      // 4. convert jsonobject json string                     json = jsonobject.tostring();                      // 5. set json stringentity                     stringentity se = new stringentity(json);                      // 6. set httppost entity                     httppost.setentity(se);                     log.i("sending", json);                     // 7. set headers inform server type of content                     httppost.setheader("accept", "application/json");                     httppost.setheader("content-type", "application/json");                      // 8. execute post request given url                     httpresponse httpresponse = httpclient.execute(httppost);                      // 9. receive response inputstream                     inputstream = httpresponse.getentity().getcontent();                      // 10. convert inputstream string                     if(inputstream != null)                         result = convertinputstreamtostring(inputstream);                     else                         result = "did not work!";                  log.i("response", result); 

any thoughts or suggestions?

update have since modified spring framework code parameters not required , not receiving values. null variables. there's issue post rather server side.

content-type should application/x-www-form-urlencoded. see so helped me once