return ComponentUtil.getFessConfig().getSystemProperty(AZUREAD_CLIENT_ID, StringUtil.EMPTY);
    }

    protected String getClientSecret() {
        return ComponentUtil.getFessConfig().getSystemProperty(AZUREAD_CLIENT_SECRET, StringUtil.EMPTY);
    }

    protected String getTenant() {
        return ComponentUtil.getFessConfig().getSystemProperty(AZUREAD_TENANT, StringUtil.EMPTY);
    }

        final Map<String, String> systemPropMap = new HashMap<>();
        FessProp.propMap.clear();
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getSystemProperty(final String key, final String defaultValue) {
                return systemPropMap.getOrDefault(key, defaultValue);
            }
        };
        ComponentUtil.setFessConfig(fessConfig);