@PostConstruct

An annotated method with noformat("@PostConstruct") is required to be called after dependencies injection (resolution of noformat("@Resource"), ...) and before being used (business methods called).

The @PostConstruct annotation is defined inside the Bean class :

@PostConstruct
private void post() {
    System.out.println("PostConstruct called by EasyBeans");
}

The output is displayed in the next section.

@PreDestroy

An annotated method with noformat("@PreDestroy") is required to be called before instance removal. Once the annotated method has been called, the bean is unavailable for futurre uses.

The @PreDestroy annotation is defined in a separate class (re-using the @Interceptors annotation). So the annotated Method goes inside the GreeterInterceptor class :

public class GreeterInterceptor {
   ...
  /**
   * Called before Bean destruction.
   * @param ic InvocationContext
   * @return proceeded method
   * @throws Exception if something wrong occurs.
   */
   @PreDestroy
   public void destroy(InvocationContext ic) throws Exception {
      System.out.println("PreDestroy invoked.");
   }
}

Simply annotate a method with @PreDestroy to release resources that may have been locked/used by the Bean.

The output for @PreDestroy and @PostConstruct :

PostConstruct called by EasyBeans             <----------- Here . . .
Method 'greetMe' invoked 1 times.
Entering method : greetMe
Message received: Guillaume
Leaving method : greetMe
PreDestroy called by EasyBeans.               <----------- . . . and here