protected static final String ERROR_DESCRIPTION = "error_description";

    protected static final String ERROR_URI = "error_uri";

    protected static final String ID_TOKEN = "id_token";

    protected static final String CODE = "code";

    protected long acquisitionTimeout = 30 * 1000L;

    protected Cache<String, Pair<String[], String[]>> groupCache;

    protected LoginCredential processCallback(final HttpServletRequest request, final String code) {
        try {
            final TokenResponse tr = getTokenUrl(code);

            final String[] jwt = ((String) tr.get("id_token")).split("\\.");
            final String jwtHeader = new String(Base64.decodeBase64(jwt[0]), Constants.UTF_8_CHARSET);
            final String jwtClaim = new String(Base64.decodeBase64(jwt[1]), Constants.UTF_8_CHARSET);