java - JSONObject["user_birthday"] not a string -

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sorry repeated problem didn't found answer on google. trying parse json object of setter/getter class.

public arraylist<user> getarraylist(stringbuffer jsonreceived){     arraylist<user> userarraylist = new arraylist<user>();     jsonobject json = new jsonobject(jsonreceived.tostring());     jsonarray usertable = json.getjsonarray("user");     (int = 0; < usertable.length(); i++) {         user user = new user();         user.setid(usertable.getjsonobject(i).getint("user_id"));         user.setlastname(usertable.getjsonobject(i).getstring("user_last_name"));         user.setfirstname(usertable.getjsonobject(i).getstring("user_first_name"));         user.setemail(usertable.getjsonobject(i).getstring("user_email"));         system.out.println(usertable.getjsonobject(i).getstring("user_birthday"));         string datestr = usertable.getjsonobject(i).getstring("user_birthday");         simpledateformat sdf = new simpledateformat("yyyy-mm-dd");         try {             date birthdate = sdf.parse(datestr);             user.setbirthday(birthdate);         } catch (parseexception e) {             e.printstacktrace();         }         user.setcountry(usertable.getjsonobject(i).getstring("user_country"));         user.setcity(usertable.getjsonobject(i).getstring("user_city"));         userarraylist.add(user);     }     system.out.println("la list d'utilisateurs : "+usertable.tostring());     system.out.println("arraylist : "+userarraylist.tostring());     return userarraylist; }

here mon json string user :

{ "tag": "getusers", "success": 1, "error": 0, "user": [     {         "user_id": "1",         "user_last_name": "alain",         "user_first_name": "ron",         "user_birthday": "2014-02-01",         "user_email": "alain@ron.fr",         "user_country": "",         "user_city": ""     },     {         "user_id": "2",         "user_last_name": "rodrigues",         "user_first_name": "richard",         "user_birthday": null,         "user_email": "richard@r.fr",         "user_country": null,         "user_city": null     } ]}

and error log :

exception in thread "awt-eventqueue-0" org.json.jsonexception: jsonobject["user_birthday"] not string. @ org.json.jsonobject.getstring(jsonobject.java:661) @ fr.moveo.applicationlourde.services.abstractmethods.getarraylist(abstractmethods.java:50) @ fr.moveo.applicationlourde.views.frames.windowconnexion.actionperformed(windowconnexion.java:75) @ javax.swing.abstractbutton.fireactionperformed(abstractbutton.java:2022) @ javax.swing.abstractbutton$handler.actionperformed(abstractbutton.java:2346) @ javax.swing.defaultbuttonmodel.fireactionperformed(defaultbuttonmodel.java:402) @ javax.swing.defaultbuttonmodel.setpressed(defaultbuttonmodel.java:259)

i have tried methods found in first , second page of google didn't work....


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