adam bien's blog

Simplest Possible POJO Injection Example With Java EE 6 📎

You can inject objects by annotating a field with javax.inject.Inject:


@Stateless
public class Cart {

    @Inject
    OrderSystem ordering;
    
    @Inject
    CustomerNotification notifier;

    public void checkout(){
        ordering.placeOrder();
        notifier.sendNotification();
    }
}

The existence of a no-arg constructor is sufficient:


public class OrderSystem {
   public void placeOrder(){
    }
}

You only need the beans.xml file in the [WAR]/WEB-INF folder with the content: <beans/>

[It is an excerpt from the project EJBAndCDI - it was pushed into http://kenai.com/projects/javaee-patterns.
The size of the WAR is 16kB (with JSF) and the initial deployment took 800ms (...somehow slow today :-)).]