java.lang.NullPointerException

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  • NullpointerException on null object reference
    via Stack Overflow by Jona A.
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    • 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(MainActivity.java:92) at com.example.roland.libraryapp.MainActivity.access$000(MainActivity.java:30) at com.example.roland.libraryapp.MainActivity$2.onResponse(MainActivity.java:74) at com.example.roland.libraryapp.MainActivity$2.onResponse(MainActivity.java:71) at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60) at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30) at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
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