<class name="vo.booking.Orders" table="orders">
   <id name="ordersId" column="ordersId" type="string" length="14">
      <generator class="assigned"/>
   </id>
   <set name="ordersDetails" table="ordersdetail" cascade="all-delete-orphan" inverse="true" lazy="true">
      <key>
         <column name="ordersId"/>
      </key>
      <one-to-many class="vo.booking.OrdersDetail"/>
   </set>
</orders>

   ...
   protected Object formBackingObject(HttpServletRequest request) throws Exception {
      String ordersId = request.getParameter("ordersId");
      if (!StringUtils.hasText(ordersId)) {
         return new OrdersForm();
      } else {
         Orders orders = getOrdersService().getOrders(ordersId);
         getOrdersService().getOrdersDetails(orders);
         return new OrdersForm(orders);
      }
   }
   protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception {
      OrdersForm ordersForm = (OrdersForm) command;
      getOrdersService().updateOrders(ordersForm.getOrders());
      response.sendRedirect(request.getContextPath() + "/orders/ordersMenu.htm");
      return null;
   }
   ...

   public void updateOrders(Orders orders) throws DataAccessException {
      /*
      getHibernateTemplate().merge(orders);   //org.hibernate.AssertionFailure: entity was not detached
      or
      getHibernateTemplate().saveOrUpdate(orders);   //org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session
      */
   }