Java Scanner Null Pointer Exception in while (line != null) loop
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What is a NullPointerException, and how do I fix it?
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Why do I get "Exception; must be caught or declared to be thrown" when I try to compile my Java code?
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avoiding null reference exceptions
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Java while loop and Threads!
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Find out what variable is throwing a NullPointerException programmatically
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ArgumentNullException or NullReferenceException from extension method?
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java.lang.IllegalStateException: Scanner closed
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NullPointerException : println needs a message in android
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Avoiding NullPointerException in Java
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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
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How do I check for nulls in an '==' operator overload without infinite recursion?
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How can I repeatedly read user input using Scanner java
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Checking for null before ToString()
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Scanner issue when using nextLine after nextXXX
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Calling class method through NULL class pointer
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Nullable type issue with ?: Conditional Operator
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When is it OK to catch NullPointerException?