declare namespace java {
    namespace rmi {
        namespace activation {
            // @ts-ignore
             class UnknownGroupException extends java.rmi.activation.ActivationException {
                /**
                 * Constructs an <code>UnknownGroupException</code> with the specified
                 * detail message.
                 */
                // @ts-ignore
                constructor(s: string)
            }
        }
    }
}
