Web Reference: Reference types in Java allow you to use the special value null which is the Java way of saying "no object". A NullPointerException is thrown at runtime whenever your program attempts to use a null as if it was a real reference. 2 days ago · Fix NullPointerException in Java with proven patterns. Covers Java 14+ enhanced messages, Optional class, @NonNull annotations, and Spring Boot scenarios. 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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