Web Reference: 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. As you should know, Java types are divided into primitive types (boolean, int, etc.) and reference types. Reference types in Java allow you to use the special value nullwhich is the Java way of saying "no object". A NullPointerException is thrown at runtime whenever your program attempts to use a nullas if it was a real reference. For example, if y... 1 day 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 ...
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