AbstractExternalizeManager extManager = null;
    protected AbstractExternalizeManager getExternalizeManager(HttpServletRequest req)         throws ServletException     {                AbstractExternalizeManager extManager = null;        if ( isSystemExternalizeRequest(req) ) {            return SystemExternalizeManager.getSharedInstance();        }        else {            SessionServlet sessionServlet = getSessionServlet(req, null);                        return sessionServlet.getSession().getExternalizeManager();        }    }