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A NullPointerException should indicate that a null value was unexpectedly encountered. Good programming practice dictates that code is structured to avoid NPE's. 

Explicitly throwing NullPointerException forces a method's callers to explicitly catch it, rather than coding to avoid it. Further, it makes it difficult to distinguish between the unexpectedly-encountered null value and the condition which causes the method to purposely throw an NPE.

If an NPE is being thrown to indicate that a parameter to the method should not have been null, use the @NotNull annotation instead.

Noncompliant Code Sample
public void doSomething (String aString) throws NullPointerException 
{}


Compliant Solution
public void doSomething (@NotNull String aString)
{}