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

Stack Overflow | zyeek | 2 weeks ago
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    Root Cause Analysis

    1. 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()
    2. com.example.user
      SelectedDevice.onCreate
      1. com.example.user.androidapp.WampTasks.Alert(WampTasks.java:66)
      2. com.example.user.androidapp.SelectedDevice.onCreate(SelectedDevice.java:13)
      2 frames
    3. Android Platform
      ActivityThread.main
      1. android.app.Activity.performCreate(Activity.java:5990)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
      4. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
      5. android.app.ActivityThread.access$800(ActivityThread.java:151)
      6. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
      7. android.os.Handler.dispatchMessage(Handler.java:102)
      8. android.os.Looper.loop(Looper.java:135)
      9. android.app.ActivityThread.main(ActivityThread.java:5254)
      9 frames
    4. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    5. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
      2 frames