Web Reference: A null pointer exception is an indicator that you are using an object without initializing it. For example, below is a student class which will use it in our code. 2 days ago · What Is NullPointerException? 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. Every Java developer encounters this exception, from beginners writing their first class to senior engineers debugging ... Aug 5, 2025 · It occurs when a program attempts to use an object reference that has the null value. In Java, "null" is a special value that can be assigned to object references to indicate the absence of a value.
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