Shopping cart persistence

Replies

• 

  VimleshMishra

  John, create your own HttpSessionListener and override sessionCreated/sessionDestroyed method to provide logic.
• 

  micheal john

  Thanks for your reply #-Link-Snipped-#
  i'm getting session values inside sessionDestroyed(), but calling getHibernateTemplate().save(orders); inside sessionDestroyed() throws "java.lang.NullPointerException"
• 

  VimleshMishra

  I believe that getHibernateTemplate() method returning you null [please debug and verify] if yes it because of you are not in spring context inside HttpSessionListener. ServiceLocator Pattern will help you here [you have to get reference of HibernateTemplate object from already initialized spring context].
• 

  micheal john

  VimleshMishra

  I believe that getHibernateTemplate() method returning you null [please debug and verify] if yes it because of you are not in spring context inside HttpSessionListener. ServiceLocator Pattern will help you here [you have to get reference of HibernateTemplate object from already initialized spring context].

  Thanks it worked😀
• 

  micheal john

  #-Link-Snipped-#, now i facing a different problem that is ,
  a user login and add items to shopping cart, afterwards click browser back button until he reaches login page and now login with different username and password and clicks on shopping cart now he sees previous users item in his list.
  
  session is getting destroyed, but shopping cart items remains
  
  please help
  😔
• 

  VimleshMishra

  Did you debug the code? How are you storing items of shopping cart in session? Debug sessionCreated and sessionDestroyed method and try to find how earlier items were added in session, let me now your findings.
• 

  micheal john

  once user adds item into cart i call addItem and set session attribute
  cartService.addItem(item);
  req.getSession().setAttribute("cartService", cartService);
• 

  VimleshMishra

  I don't think problem is here, problem must be in session listener which populating session with existing items. Debug it or will be great if you can share source code of your session listener.
• 

  micheal john

  public class MySessionListener implements HttpSessionListener {
  
  @Override
  public void sessionCreated(HttpSessionEvent event) {
  System.out.println("sessionCreated()");
  System.out.println("Session created ID --> " + event.getSession().getId());
  }
  
  @Override
  public void sessionDestroyed(HttpSessionEvent event) {
  synchronized (this) {
  try
  {
  System.out.println("sessionDestroyed()");
  ServletContext servletContext = event.getSession().getServletContext();
  WebApplicationContext appContext = WebApplicationContextUtils.getWebApplicationContext(servletContext);
  RegistrationDAO registrationDAO = (RegistrationDAO) appContext.getBean("registrationDAO");
  
  Cart cartService = (Cart) event.getSession().getAttribute("cartService");
  User user = (User) event.getSession().getAttribute("userSession");
  int ShoppingcartSerialNum = 0;
  Date dat = new Date();
  String date = ""+ (dat.getDate() + dat.getDay() + dat.getYear() + dat.getTime());
  String ShoppingcartRefNum = date + user.getUserId();
  if(cartService != null && !user.getEmailId().equals("#-Link-Snipped-#") && user != null)
  {
  List cartList = cartService.getAllItems();
  for (Item item : cartList) {
  if(item.getShoppingCartRefNum().equals("0"))
  {
  ++ShoppingcartSerialNum;
  String num;
  if (item.getSearchType().equals("Person")) {
  num = ((uri.external_search_person_asic_gov.ReplyDataType.Person) (item
  .getSearchDetails())).getPersonName().getPersonId();
  }
  else if (item.getSearchType().equals("Business")) {
  num = ((uri.external_bn_search_asic_gov.ReplyDataType.Entities) (item
  .getSearchDetails())).getBusinessName().getNniNumber();
  }else {
  num = item.getNumber();
  }
  registrationDAO.insertorder(item.getDescription(),
  item.getSearchType(), num, item.getExtractType(),
  item.getCost(), user, ShoppingcartSerialNum,
  ShoppingcartRefNum, item.getRequestMessage(),
  item.getCountOfName(), item.getPersonSearchIdfr(),
  item.getPersonIdentifier(), item.getNumber(),
  item.getRegisterType(), item.getWeekStartDate(),
  item.getSummaryType());
  }
  }
  }
  }catch(Exception e){
  // e.printStackTrace();
  System.out.println("Root cause of exception "+e.getCause());
  }
  
  }
  System.out.println("Session destroyed ID --> " + event.getSession().getId());
  }
  
  }
• 

  VimleshMishra

  Hey why no any logic in sessionCreated method? You should set cart items in session once session created. Get items from database for given logged in user and set values in session to show on shopping cart page.
• 

  micheal john

  VimleshMishra

  Hey why no any logic in sessionCreated method? You should set cart items in session once session created. Get items from database for given logged in user and set values in session to show on shopping cart page.

  Ok