java - Getting null pointer exception on callbackmanager -


i'm using facebook sdk. when logging, i'm getting nullpointer exception,

 loginbutton loginbutton;     callbackmanager callbackmanager;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         callbackmanager = callbackmanager.factory.create();         facebooksdk.sdkinitialize(getapplicationcontext());          setcontentview(r.layout.activity_main);         loginbutton = (loginbutton)findviewbyid(r.id.login_button);         list<string> permissionneeds = arrays.aslist("user_photos", "email", "user_birthday", "public_profile");         loginbutton.setreadpermissions(permissionneeds);         loginbutton.registercallback(callbackmanager, new facebookcallback<loginresult>()         {             @override             public void onsuccess(loginresult loginresult)             {                 system.out.println("onsuccess");             }              @override             public void oncancel()             {                 system.out.println("oncancel");             }              @override             public void onerror(facebookexception exception)             {                 log.v("loginactivity", exception.getcause().tostring());             }         });        }       @override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);         callbackmanager.onactivityresult(requestcode, resultcode, data);     }

the error raising method onactivityresult on second line, callbackmanager.onactivityresult(requestcode, resultcode, data);.

part of stacktrace:

06-20 14:07:52.253  21310-21310/com.itspirits.fbchatdownloader e/androidruntime﹕ fatal exception: main process: com.itspirits.fbchatdownloader, pid: 21310 java.lang.runtimeexception: failure delivering result resultinfo{who=null, request=64206, result=-1, data=intent { (has extras) }} activity {com.itspirits.fbchatdownloader/com.itspirits.fbchatdownloader.mainactivity}: java.lang.nullpointerexception         @ android.app.activitythread.deliverresults(activitythread.java:3365)         @ android.app.activitythread.handlesendresult(activitythread.java:3408)         @ android.app.activitythread.access$1300(activitythread.java:135)         @ android.app.activitythread$h.handlemessage(activitythread.java:1244)         @ android.os.handler.dispatchmessage(handler.java:102)         @ android.os.looper.loop(looper.java:136)         @ android.app.activitythread.main(activitythread.java:5017)         @ java.lang.reflect.method.invokenative(native method)         @ java.lang.reflect.method.invoke(method.java:515)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:595)         @ dalvik.system.nativestart.main(native method)  caused by: java.lang.nullpointerexception         @ com.itspirits.fbchatdownloader.mainactivity$1.onerror(mainactivity.java:53)         @ com.facebook.login.loginmanager.finishlogin(loginmanager.java:507)         @ com.facebook.login.loginmanager.onactivityresult(loginmanager.java:192)         @ com.facebook.login.loginmanager$1.onactivityresult(loginmanager.java:140)         @ com.facebook.internal.callbackmanagerimpl.onactivityresult(callbackmanagerimpl.java:82)         @ com.itspirits.fbchatdownloader.mainactivity.onactivityresult(mainactivity.java:69)         @ android.app.activity.dispatchactivityresult(activity.java:5423)         @ android.app.activitythread.deliverresults(activitythread.java:3361)             at android.app.activitythread.handlesendresult(activitythread.java:3408)             at android.app.activitythread.access$1300(activitythread.java:135)             at android.app.activitythread$h.handlemessage(activitythread.java:1244)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:136)             at android.app.activitythread.main(activitythread.java:5017)             at java.lang.reflect.method.invokenative(native method)             at java.lang.reflect.method.invoke(method.java:515)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:595)             at dalvik.system.nativestart.main(native method)

is callbackmanager null? data null? (unlikely)

you can simple debuging printing variables before use see , when null :-)


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