Using @SessionValue

Rather than explicitly injecting the Session into a controller method you can instead use @SessionValue. For example:

Using @SessionValue

    @Get("/cart")
    @SessionValue(ATTR_CART) (1)
    Cart viewCart(@SessionValue @Nullable Cart cart) { (2)
        if (cart == null) {
            cart = new Cart();
        }
        return cart;
    }

Using @SessionValue

    @Get("/cart")
    @SessionValue("cart") (1)
    Cart viewCart(@SessionValue @Nullable Cart cart) { (2)
        if (cart == null) {
            cart = new Cart()
        }
        cart
    }

Using @SessionValue

    @Get("/cart")
    @SessionValue(ATTR_CART) (1)
    internal fun viewCart(@SessionValue cart: Cart?): Cart { (2)
        var cart = cart
        if (cart == null) {
            cart = Cart()
        }
        return cart
    }