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. 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. Jan 16, 2026 · This exception is thrown when a program tries to use an object reference that has a null value. Understanding what causes NullPointerException, how to detect it, and most importantly, how to prevent it is crucial for writing robust and reliable Java applications.
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