How can I solve Exception in thread "main" java.lang.NullPointerException error
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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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Why does Java have a "NullPointerException" when there are no pointers in Java?
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Difference between java.lang.RuntimeException and java.lang.Exception
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System.NullPointerException: Attempt to de-reference a null object ,sravn
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Java - Could not find the main class
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RuntimeException: Unable to instantiate application
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What is null in Java?
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Can Java's NullPointerException be changed to report on which variable was null?
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How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
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IllegalArgumentException or NullPointerException for a null parameter?
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I get exception when using Thread.sleep(x) or wait()
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NullPointerException accessing views in onCreate()
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avoiding null reference exceptions
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Compiler warning: null reference exception
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"Could not find the main class" error
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Update ListView in the main thread from another thread