Trying to run a JFrame with BorderLayout but the program is having a run-time error. java.lang.NullPointerException pops up
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What is a NullPointerException, and how do I fix it?
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How to programmatically close a JFrame
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NullPointerException when installing the Android SDK on Mac OS X
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How to debug NullPointerException in selenium-java
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System.NullPointerException
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cannot run a simple java code
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NullPointerException but compiling?
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Avoiding NullPointerException in Java
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ActionListener isn't Implementing
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Gui JList ActionListener
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p:commandButton action throws javax.el.PropertyNotFoundException
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System.NullPointerException: Attempt to de-reference a null object
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What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
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Put a JButton in the center of the screen with BorderLayout
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Java: Why aren't NullPointerExceptions called NullReferenceExceptions?
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Why does String.valueOf(null) throw a NullPointerException?
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Unable instantiate android.gms.maps.MapFragment