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? 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. Learn what causes and how to handle NullPointerException, a runtime exception thrown when an application uses null where an object is required. See the constructors, methods and inherited fields of this class.
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