NullPointerException
class NullPointerException extends RuntimeException
null or undefined turned up where an object was required.
Thrown by requireNonNull.
Every class in this hierarchy takes an optional message, another exception whose message it reuses, or nothing at all. isException recognises all of them; a plain Error is not one.
Examples
Throwing and catching
throw new NullPointerException("something specific about this call");
try {
doWork();
} catch (error) {
if (error instanceof NullPointerException) {
// handled
}
}
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.