Caused by: java.lang.NullPointerException MainActivity.onPostCreate
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What is a NullPointerException, and how do I fix it?
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Add a button to the main_activity view with Java code
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avoiding null reference exceptions
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getClass().getResource() always returning null
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com.sun.istack.SAXException2 : Instance ... is substituting "java.lang.Object", but ... is bound to an anonymous type
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Java: Exception itself is null
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IllegalArgumentException or NullPointerException for a null parameter?
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setOnClickListener crashs my android app
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Why does Java have a "NullPointerException" when there are no pointers in Java?
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Nullable Object must have a value #2
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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
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What is a void pointer and what is a null pointer?
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NullPointerException when Creating an Array of objects
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System.NullPointerException: Attempt to de-reference a null object:
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What is a NullReferenceException, and how do I fix it?
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Why does String.valueOf(null) throw a NullPointerException?
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Caught Throwable or Exception is null