public void contextInitialized(ServletContextEvent evt) {
        //get context
        ServletContext context = evt.getServletContext();
       String fileName = (context.getRealPath("/data/Order.xml"));
        
        XmlHelper xmlHelper = new XmlHelper();
        
        
        //set filename
        //OrderDAO.setFilename(context.getRealPath("/data/Order.xml"));
        
        //create dao
        //OrderDAO orderDAO = new OrderDAO();
         
        //get list from dao
        //List ordersList = (List) orderDAO.retrieveOrders();
        
        //store in context
        evt.getServletContext().setAttribute("ordersList", xmlHelper.loadFile(fileName));
    }