Something

 public void contextDestroyed(ServletContextEvent evt) {                 ServletContext context = evt.getServletContext();        //set filename        String fileName = context.getRealPath("/data/Order.xml");                //create dao        //OrderDAO orderDAO = new OrderDAO();                //orderDAO.setOrdersList((LinkedList) evt.getServletContext().getAttribute("ordersList"));                XmlHelper xmlHelper = new XmlHelper();                xmlHelper.storeFile((LinkedList) evt.getServletContext().getAttribute("ordersList"), fileName);        //update        //orderDAO.update((LinkedList) evt.getServletContext().getAttribute("ordersList"));    }