Web Reference: You avoid null checks by not returning null in the first place — use Optional or default (null-object) values instead. If something must never be null, validate it once at the start using Objects.requireNonNull (). 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 ... Jan 16, 2026 · 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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