Question

I really to init a sessionScope variable when an app runs. Which is the right way to do this ?

// Edit: Firstly, I want to sorry for my not understandable question. All what I want is : An listener or something like that which can listen when the app runs first time and create session and put an attribute to it.

Thanks

Answer 1

Implement a HttpSessionListener.

@WebListener
public class SessionConfigureListener implements HttpSessionListener {

    @Override
    public void sessionCreated(HttpSessionEvent event) {
        event.getSession().setAttribute("foo", new Foo());
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent event) {
        // NOOP.
    }

}

That’s it. If you’re still not on Servlet 3.0 (Tomcat 7, Glassfish 3, etc) yet, then you need to register it as <listener> in web.xml instead of using @WebListener annotation.