25.65 java.lang.UnknownError (JDK 1.0)

Signals that an unknown error has occurred at the level of the Java Virtual Machine.

public class UnknownError extends VirtualMachineError {
    // Public Constructors
            public UnknownError();
            public UnknownError(String s);
}

Hierarchy:

Object->Throwable(Serializable)->Error->VirtualMachineError->UnknownError