Web Reference: What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? What methods/tools can be used to determine the cause so that you stop the exception from causing the program to terminate prematurely? 5 days ago · NullPointerException (NPE) is the single most common runtime exception in Java. It is thrown when your code attempts to use an object reference that has not been assigned to an actual object -- in other words, the reference points to null. Aug 5, 2025 · To avoid the NullPointerException, we must ensure that all the objects are initialized properly, before we use them. When we declare a reference variable, we must verify that object is not null, before we request a method or a field from the objects.
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