final SmbAuthException sae) {
        if (a == null) {
            return null;
        }
        synchronized (a) {
            a.url = url;
            a.sae = sae;
            return a.getNtlmPasswordAuthentication();
        }
    }

    /**
     * An application extending this class must provide an implementation for this method that returns new user

        if (auth == null) {
            return null;
        }
        synchronized (auth) {
            auth.url = url;
            auth.sae = sae;
            return auth.getNtlmPasswordAuthentication();
        }
    }

    /**