json - Connection issues in android, stream returning null -

i trying data database listview. have used jsonparsing that. when run servlet correct parsed value. m trying make connection not coming off

dbmapping

public class mysearch extends activity {      class event_location{         string place;         string area;         int cost2;         int cost2wa;         int uid;         @override         public string tostring() {             return "venue details [place=" + place +", area=" + area + ", cost2=" + cost2 + ", cost2wa = "+ cost2wa +"]";         }     }     class fetchcollegedetailstask extends asynctask<void, void, inputstream> {          @override         protected inputstream doinbackground(void... arg0) {             log.e("testing @@@@@@" ,"test connnection" +                     "" );             //192.168.1.102:8080/first/myservlet             //string stringurl="http://www.google.com";             string stringurl="http://192.168.1.102:8080/first/myservlet";             url url;             try {                 url = new url(stringurl);                      log.e("url data test  "   , ""+ url);                 //log.e("test"+ url.openconnection().getinputstream() , "");                     log.e("hiii", "hiii");                      //log.e("input",""+url.openconnection().getinputstream() );                 //  return url.openconnection().getinputstream();                 urlconnection connection = url.openconnection();                 log.e("test" ,""+ connection); 

after above line nothing taking place::

            inputstream stream = connection.getinputstream();                 log.e("stream" ,""+ stream);                 //string test = url.openconnection().getinputstream();                 return stream;               } catch (malformedurlexception e) {                  log.e("amit", "search");                 // todo auto-generated catch block                 e.printstacktrace();             } catch (ioexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }              return null;         }          @override         protected void onpostexecute(inputstream result) {             super.onpostexecute(result);              log.e("result", ""+result);             stringbuilder builder = new stringbuilder();             bufferedreader reader = new bufferedreader(new inputstreamreader(result));              string line = null;             try {                 while((line = reader.readline()) != null) {                     builder.append(line);                 }             } catch (ioexception e) {                 e.printstacktrace();             }              string jsonstring = builder.tostring();             log.e("getcoursesactivity", jsonstring);              try {                 jsonobject rootobject = new jsonobject(jsonstring);                 jsonarray jsonarray = rootobject.getjsonarray("event_locations");                                (int index = 0; index < jsonarray.length(); index++) {                     jsonobject object = (jsonobject) jsonarray.get(index);                     event_location detail = new event_location();                     detail.place = object.getstring("place");                     detail.area = object.getstring("area");                     detail.cost2 = object.getint("cost_for_2");                     detail.cost2wa = object.getint("cost_for_2_wa");                     array.add(detail);                 }             }                  catch (jsonexception e) {                     e.printstacktrace();                 }             adapter.notifydatasetchanged();             }  }     private arraylist<event_location> array;     private arrayadapter<event_location> adapter;     private listview listview;      @override     protected void oncreate(bundle savedinstancestate){         super.oncreate(savedinstancestate);         setcontentview(r.layout.search);           array = new arraylist<event_location>();         log.e("array"+ array ,"");          listview = (listview) findviewbyid(r.id.listview);         adapter = new arrayadapter<event_location>(this, android.r.layout.simple_expandable_list_item_1,array);       //  adapter = new arrayadapter<event_location>(this, android.r.layout.simple_list_item_1, array);         listview.setadapter(adapter);     }      @suppresslint("newapi")     @override     public boolean onoptionsitemselected(menuitem item) {         log.e("test","test");              if (item.gettitle().equals("parse")) {                 strictmode.setthreadpolicy(new strictmode.threadpolicy.builder().detectnetwork().detectall().build());                 new fetchcollegedetailstask().execute();             }             return super.onoptionsitemselected(item);     } 

data should come listview after clicking on parse option in menu

    @override     public boolean oncreateoptionsmenu(menu menu) {             menu.add("parse");         return true;     } }