java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.androidapp/com.example.user.androidapp.SelectedDevice}: java.lang.NullPointerException: Attempt to invoke virtual method 'rx.Observable ws.wamp.jawampa.WampClient.publish(java.lang.String, java.lang.Object[])' on a null object reference

Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via Stack Overflow by zyeek
, 1 year ago
Unable to start activity ComponentInfo{com.example.user.androidapp/com.example.user.androidapp.SelectedDevice}: java.lang.NullPointerException: Attempt to invoke virtual method 'rx.Observable ws.wamp.jawampa.WampClient.publish(java.lang.String, java.lang.Object[])' on a null object reference
via GitHub by cdrandin
, 11 months ago
Unable to start activity ComponentInfo{com.example.cdrandin.androidapp/com.example.cdrandin.androidapp.SelectedDevice}: java.lang.NullPointerException: Attempt to invoke virtual method 'rx.Observable ws.wamp.jawampa.WampClient.publish(java.lang.String, java.lang.Object[])' on a null object reference
via Stack Overflow by We are Borg
, 2 years ago
Unable to start activity ComponentInfo{internetlegion.twentynotes/internetlegion.twentynotes.Activity.GroupCanvasActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object org.springframework.http.ResponseEntity.getBody()' on a null object reference
via Stack Overflow by Matas Bagočiūnas
, 1 year ago
Unable to start activity ComponentInfo{com.example.egnasz.myapplication/com.example.egnasz.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference
via Stack Overflow by Matas Bagociunas
, 1 year ago
Unable to start activity ComponentInfo{com.example.egnasz.myapplication/com.example.egnasz.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference
via Stack Overflow by We are Borg
, 2 years ago
Unable to start activity ComponentInfo{internetlegion.twentynotes/internetlegion.twentynotes.Activity.GroupCanvasActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object org.springframework.http.ResponseEntity.getBody()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'rx.Observable ws.wamp.jawampa.WampClient.publish(java.lang.String, java.lang.Object[])' on a null object reference	at com.example.user.androidapp.WampTasks.Alert(WampTasks.java:66)	at com.example.user.androidapp.SelectedDevice.onCreate(SelectedDevice.java:13)	at android.app.Activity.performCreate(Activity.java:5990)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)	at android.app.ActivityThread.access$800(ActivityThread.java:151)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)