@PostMapping("/addProduct")
    public String add2(@ModelAttribute Product product,
                       Integer amount,
                       Model model){
        ProductToShoppingCart productToShoppingCart=new ProductToShoppingCart();
        productToShoppingCart.setProduct(product);
        productToShoppingCart.setAmount(amount);
        shoppingCart.addProductToShoppingCart(productToShoppingCart);
        model.addAttribute("productAdded", true);
        return "index";
    }