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  • NullpointerException on null object reference
    via Stack Overflow by Jona A.
    • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference at com.example.roland.libraryapp.MainActivity.showJSON( at com.example.roland.libraryapp.MainActivity.access$000( at com.example.roland.libraryapp.MainActivity$2.onResponse( at com.example.roland.libraryapp.MainActivity$2.onResponse( at at at$ at android.os.Handler.handleCallback( at android.os.Handler.dispatchMessage( at android.os.Looper.loop( at at java.lang.reflect.Method.invoke(Native Method) at$ at
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