* 
     * This will require that a keytab is configured in this service.
     * 
     * 
     */
    public JAASAuthenticator () {
        this("jcifs");
    }


    /**
     * Create an authenticator using the given JAAS service
     * 
     * This will require that a keytab is configured in this service.
     * 
     * @param serviceName