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Hacking With the JSONB 1.0 Public Review [Snippet]

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Hacking With the JSONB 1.0 Public Review [Snippet]

This article gives a quick example of JSR 367, the JSONB spec.

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The Public Review of JSR 367 (JSONB 1.0) has just recently been announced. The snapshot version can already be tested.

For an example see the JSONB module of my JAX-RS Hypermedia project.

As JSONB — provided by the reference implementation — can’t obviously be integrated in JAX-RS yet, we need some boilerplate code in the JAX-RS resource methods.

See the CartResource class as an example:

@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);

        ...
    }
}

This shows us one of the most important benefits of using Java EE: being able to seamlessly integrate various specifications — without these extra efforts of course — as soon as the new specs are final and incorporated.

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Topics:
jsonb ,jsr 367 ,jax-rs

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