sebastiandaschner blog

@Path("shopping_cart")
public class CartResource {

    ...

    // JAX-RS 2.0 obviously isn't integrated with JSONB yet
    private Jsonb jsonb;

    // as deserialization is done manually, validation also isn't integrated by JAX-RS
    @Inject
    Validator validator;

    @PostConstruct
    public void initJsonb() {
        jsonb = JsonbBuilder.create();
    }

    @GET
    public StreamingOutput getShoppingCart() {
        final ShoppingCart cart = shoppingCart.getShoppingCart();
        ...

        return output -> jsonb.toJson(cart, output);
    }

    @POST
    public void addItem(InputStream input) {
        final CartInsertion insertion = jsonb.fromJson(input, CartInsertion.class);

        final Set<ConstraintViolation<CartUpdate>> violations = validator.validate(insertion);
        if (!violations.isEmpty())
            throwBadRequest(violations);

        ...
    }
}