How to configure a start up managed bean?

问题

I want a managed bean to run internally on start up in my JSF web application when the application loads. How can I write this class and configure in Glassfish?

回答1:

In JSF with CDI, observe the initialization of the application scope.

@Named
@ApplicationScoped
public class App {

    public void startup(@Observes @Initialized(ApplicationScoped.class) Object context) {
        // ...
    }

    public void shutdown(@Observes @Destroyed(ApplicationScoped.class) Object context) {
        // ...
    }

}

When having OmniFaces at hands, this can be simplified with @Eager.

@Named
@Eager
@ApplicationScoped
public class App {

    @PostConstruct
    public void startup() {
        // ...
    }

    @PreDestroy
    public void shutdown() {
        // ...
    }
}

In JSF 2.2- with the now deprecated javax.faces.bean annotations, use an application scoped managed bean which is eagerly initialized.

@ManagedBean(eager=true)
@ApplicationScoped
public class App {

    @PostConstruct
    public void startup() {
        // ...
    }

    @PreDestroy
    public void shutdown() {
        // ...
    }
}

来源：https://stackoverflow.com/questions/11474882/how-to-configure-a-start-up-managed-bean