Undefined.EXCEPTION (groovy 3.0.19 API)

public static final class Undefined.EXCEPTION
extends RuntimeException

Inherited Methods
Methods inherited from class	Name
`class RuntimeException`	`printStackTrace, printStackTrace, printStackTrace, fillInStackTrace, getCause, initCause, toString, getMessage, getSuppressed, getLocalizedMessage, getStackTrace, setStackTrace, addSuppressed, wait, wait, wait, equals, hashCode, getClass, notify, notifyAll`

[Java] Class Undefined.EXCEPTION