java - Issue making HTTP post request with json -

my request code can seen here:

public static void execute() {     map<string, string> comment = new hashmap<string, string>();     comment.put("sourcecode", "int x = 0;");     comment.put("language", "54");     comment.put("input", "");     string json = new gsonbuilder().create().tojson(comment, map.class);     httpresponse response = makerequest("http://api.compilers.sphere-engine.com/api/v3/submissions?access_token" +             "=a3bdc6343aa21ebe9f28ecd7c8a8c43f", json);     try {         string responsestr = entityutils.tostring(response.getentity());         log.d("response", responsestr);     } catch (ioexception e) {         e.printstacktrace();     }  }  public static httpresponse makerequest(string uri, string json) {     try {         httppost httppost = new httppost(uri);         httppost.setentity(new stringentity(json));         log.d("responselate", entityutils.tostring(httppost.getentity()));         return new defaulthttpclient().execute(httppost);     } catch (unsupportedencodingexception e) {         e.printstacktrace();     } catch (clientprotocolexception e) {         e.printstacktrace();     } catch (ioexception e) {         e.printstacktrace();     }     return null; } 

the request made server, not using json, getting error message in response missing required parameters.

in makerequest method log httppost.getentity() , value

06-04 01:21:45.814  24533-24736/me.dylanredfield.testbase3 d/responselate﹕ {"input":"","language":"54","sourcecode":"int x \u003d 0;"} 

thanks help!

you haven't pass content-type server failed recognize type of request...

set

httppost.setheader(http.content_type,"application/json"); 

befor setentity()