JAX-WS + CDI in Java EE 6

JAX-WS + CDI in Java EE 6 One of the big features in Java EE 6 is dependency injection(yeah, 330 & 299 stuff!!). It pretty much integrated with the every EE component. That means you can nicely use all the CDI features with JAX-WS web services. Let us see a simple shopping cart web service that uses CDI. @WebService public class ShoppingCart { @Inject private CartData cart; public List addCart(String item) { return cart.addCart(item); } } @SessionScoped public class CartData implements Serializable { private List items = new ArrayList(); public List addCart(String item) { items.add(item); return items; } } First, you may have noticed the two unfamiliar annotations: @Inject, @SessionScoped. As you may have guessed from @Inject annotation, a CartData instance would be injected into ShoppingCart instance. Right, but what is the lifecycle of a CartData instance ? A CartData instance is tied to a client's HTTP session scope since it uses @SessionScoped annotation. If a client uses the web service after its session expires, the container creates a new CartData instance behind the scenes. One needs to write a lot of code to do this in Java EE 5, now it is that simple in Java EE 6 ! To try the service, let us specify in web.xml that a HTTP session timeout is a minute. 1 Also, to enable CDI, one needs to package an empty beans.xml. So our war file wo...

Date: February, 19 2010
Url: http://www.java.net/blog/jitu/archive/2010/02/19/jax-ws-cdi-java-ee-6-0

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