rest - Attempt to invoke virtual method 'void com.newflame.pro.app.AppController.addToRequestQueue(com.android.volley.Request)' on a null object reference -

i trying use volley multipart requester, , i'm getting following error.

java.lang.nullpointerexception: attempt invoke virtual method 'void com.newflame.pro.app.appcontroller.addtorequestqueue(com.android.volley.request)' on null object reference   @ com.newflame.pro.networking.multipartrequester.multipart_volley_requester(multipartrequester.java:64)   @ com.newflame.pro.networking.multipartrequester.<init>(multipartrequester.java:35)   @ com.newflame.pro.flame.loginnew.senddatatoserver(loginnew.java:313)   @ com.newflame.pro.flame.loginnew.access$100(loginnew.java:75)   @ com.newflame.pro.flame.loginnew$2$1$1.callback(loginnew.java:197)   @ com.androidquery.callback.bitmapajaxcallback.checkcb(bitmapajaxcallback.java:502)   @ com.androidquery.callback.bitmapajaxcallback.callback(bitmapajaxcallback.java:472)   @ com.androidquery.callback.bitmapajaxcallback.callback(bitmapajaxcallback.java:65)   @ com.androidquery.callback.abstractajaxcallback.callback(abstractajaxcallback.java:499)   @ com.androidquery.callback.abstractajaxcallback.afterwork(abstractajaxcallback.java:1261)   @ com.androidquery.callback.abstractajaxcallback.run(abstractajaxcallback.java:986)   @ android.os.handler.handlecallback(handler.java:739)   @ android.os.handler.dispatchmessage(handler.java:95)   @ android.os.looper.loop(looper.java:148)   @ android.app.activitythread.main(activitythread.java:5417)   @ java.lang.reflect.method.invoke(native method)   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616) 

here appcontroler.java

public class appcontroller extends application {      public static final string tag = appcontroller.class.getsimplename();     private static double total=0;     public static arraylist<menu> menulistglobal = new arraylist<menu>();      private requestqueue mrequestqueue;     private imageloader mimageloader;     lrubitmapcache mlrubitmapcache;      private static appcontroller minstance;      public static double gettotal() {         return total;     }      public static void settotal(double total) {         appcontroller.total = total;     }      @override     public void oncreate() {         super.oncreate();      }      public static synchronized appcontroller getinstance() {         return minstance;     }      public requestqueue getrequestqueue() {         if (mrequestqueue == null) {              mrequestqueue = volley.newrequestqueue(getapplicationcontext());         }          return mrequestqueue;     }      public imageloader getimageloader() {         getrequestqueue();         if (mimageloader == null) {             getlrubitmapcache();             mimageloader = new imageloader(this.mrequestqueue, mlrubitmapcache);         }          return this.mimageloader;     }      public lrubitmapcache getlrubitmapcache() {         if (mlrubitmapcache == null)             mlrubitmapcache = new lrubitmapcache();         return this.mlrubitmapcache;     }      public <t> void addtorequestqueue(request<t> req, string tag) {         req.settag(textutils.isempty(tag) ? tag : tag);         getrequestqueue().add(req);     }      public <t> void addtorequestqueue(request<t> req) {         req.settag(tag);         req.setshouldcache(false);         getrequestqueue().add(req);     }      public void cancelpendingrequests(object tag) {         if (mrequestqueue != null) {             mrequestqueue.cancelall(tag);         }     }      @override     protected void attachbasecontext(context base) {         super.attachbasecontext(base);      } } 

here multipartrequester.java

public class multipartrequester {      context activity;     private asynctaskcompletelistener asynctaskcompletelistener;     int service_code;       public multipartrequester(context activity, map<string, string> map, int service_code, asynctaskcompletelistener asynctaskcompletelistener) {          this.activity = activity;         this.service_code = service_code;         this.asynctaskcompletelistener = asynctaskcompletelistener;         string url = map.get(const.url);         map.remove(const.url);         multipart_volley_requester(url, map);     }      void multipart_volley_requester(string url, map<string, string> map) {          multipartrequest mr = new multipartrequest(url, new response.errorlistener() {              @override             public void onerrorresponse(volleyerror error) {                 log.d("ashutosh", error.tostring());                 string msg = "no network connection.please check internet";                 //andyutils.showlongtoast(msg,activity);                 //andyutils.removeprogressdialog();             }          }, new response.listener<string>() {              @override             public void onresponse(string response)             {                 log.d("multipartresponse",response);                 asynctaskcompletelistener.ontaskcompleted(response.tostring(), service_code);             }          }, map);          mr.setretrypolicy(new defaultretrypolicy(const.timeout,                 const.max_retry,                 const.default_backoff_mult));         appcontroller.getinstance().addtorequestqueue(mr);     } } 

and code, im pinging multipartrequester class

private void senddatatoserver() {      log.d("shan","thread1executing");      log.d("shanpic",name);     log.d("shanpic",ssocial_unique_id);      hashmap<string, string> map = new hashmap<>();     map.put(const.url, constant.loginurl);          map.put(const.params.social_unique_id, ssocial_unique_id);         map.put(const.params.login_by, constant.facebook);       map.put(const.params.username, name);       //   map.put(const.params.dob, dob);     if(semailid!=""){      map.put(const.params.email, semailid);    }      map.put(const.params.picture, filepath);      map.put(const.params.device_type, const.android);     if(preferences.getstring(property_reg_id, "")!="")     {         map.put(const.params.device_token, preferences.getstring(property_reg_id, ""));     }      new multipartrequester(loginnew.this, map, const.servicecode.register, this); } 

you not initializing minstance variable. initialize minstance in getinstance method.

change

public static synchronized appcontroller getinstance() {     return minstance; } 

to,

public static synchronized appcontroller getinstance() {     if(minstance == null){         minstance = new appcontroller();     }     return minstance; }