public Kerb5Authenticator clone() {
        JAASAuthenticator auth = new JAASAuthenticator();
        cloneInternal(auth, this);
        return auth;
    }

    /**
     * Clone the context
     *
     * @param to the target authenticator
     * @param from the source authenticator
     */
    protected static void cloneInternal(JAASAuthenticator to, JAASAuthenticator from) {