java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nom.sudokuhint/com.nom.sudokuhint.MainActivity}: java.lang.NullPointerException

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  • Android App Thread Exception null pointer
    via Stack Overflow by Pradeep Bhat
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    • java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nom.sudokuhint/com.nom.sudokuhint.MainActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) at android.app.ActivityThread.access$800(ActivityThread.java:135) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 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) Caused by: java.lang.NullPointerException at com.nom.sudokuhint.Sudoku.stringify(Sudoku.java:44) at com.nom.sudokuhint.Sudoku.<init>(Sudoku.java:21) at com.nom.sudokuhint.MainActivity.<init>(MainActivity.java:17) at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1208) at android.app.Instrumentation.newActivity(Instrumentation.java:1061) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112) ... 11 more
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