@RequestMapping("/register")
  public String registerCustomer(Model model) {
    Customer customer = new Customer();
    BillingAddress billingAddress = new BillingAddress();
    ShippingAddress shippingAddress = new ShippingAddress();
    customer.setBillingAddress(billingAddress);
    customer.setShippingAddress(shippingAddress);

    model.addAttribute("customer", customer);

    return "registerCustomer";
  }