Web Reference: Depending on your use case, it can also make sense to disallow null values for foo and throw a NullPointerException if a null foo is passed to your method. 2 days ago · Every Java developer encounters this exception, from beginners writing their first class to senior engineers debugging production systems. The Java Language Specification defines the specific operations that trigger a NullPointerException: Calling an instance method on a null reference Accessing or modifying a field of a null reference Jun 15, 2025 · At its core, a null reference is a special marker in Java that indicates a reference variable points to no object or instance in memory. In programming terms, it serves as a placeholder for “nothing” or “no value.”
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