java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.owner.sqlite.MyDBHandler.addStudent(com.example.owner.sqlite.Student)' on a null object reference at com.example.owner.sqlite.MainActivity.onClick(MainActivity.java:35) at android.view.View.performClick(View.java:4785) at android.view.View$PerformClick.run(View.java:19884) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135)
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