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Static fields on a null reference in Java
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ArgumentNullException or NullReferenceException from extension method?
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getOnClickListener() in Android views
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Error: "an object reference is required for the non-static field, method or property..."
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JMenu ActionListener
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avoiding null reference exceptions
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NullPointerException accessing views in onCreate()
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How to avoid ArrayIndexOutOfBoundsException or IndexOutOfBoundsException?
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How come invoking a (static) method on a null reference doesn't throw NullPointerException?
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How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
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Differences between action and actionListener
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NullPointerException when installing the Android SDK on Mac OS X
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System.NullPointerException: Attempt to de-reference a null object: