@Override
  public String execute() throws Exception {
    super.execute();
    if (id != 0 && session != null) {
      Map<Integer, CartEntry> cart = (Map<Integer, CartEntry>)session.get("cart");
      if (!cart.containsKey(id)) {
        CartEntry entry = new CartEntry();
        entry.setItem(id);
        entry.setQte(0);
        if (session.containsKey("userid")) {
          entry.setClient((Integer)session.get("userid"));
        }
        cart.put(id, entry);
      }
      cart.get(id).setQte(cart.get(id).getQte() + 1);
    }
    return SUCCESS;
  }