RuntimeException
class RuntimeException extends Exception
The parent of every exception a running script can provoke. Nearly all the classes below extend it rather than Exception directly.
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 RuntimeException("something specific about this call");
try {
doWork();
} catch (error) {
if (error instanceof RuntimeException) {
// handled
}
}
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.