*
     * @see jcifs.smb.Kerb5Authenticator#getSubject()
     */
    @Override
    public synchronized Subject getSubject () {
        if ( this.cachedSubject != null ) {
            return this.cachedSubject;
        }

        try {
            log.debug("Logging on");
            LoginContext lc;

	    Subject ps = super.getSubject();

            if ( this.configuration != null ) {