Listener for Session Expiration

Bill Burdick

Greetings!

How do I listen for a session expiring? I have an application that has users, and I would like to log when they are 'logged off' (by their session expiring).

Joonas Lehtinen

Override Application.close() - it will get called when the application end (either explicitly or by session expiration).

Artur Signell

Application.close() is called when the application session ends either by session expiration or for another reason (ending it from the code). You could override it and do the logging there.

Bill Burdick

Jonas and Artur,

Thanks for the quick response.

Bill.

David Wall

Is the session already ended when close() is called? That is, can I retrieve a session object (the user) or is it already gone by the time I get this call?

Joonas Lehtinen

David Wall: Is the session already ended when close() is called? That is, can I retrieve a session object (the user) or is it already gone by the time I get this call?

Should be possible.

Gugan Mohan

I'm doing a project in Vaadin 7. In that I need to hide my UI(or disable access to UI) when a user session expires.

I tried overriding the

@Override
public void close() {
    // Stuff to disable UI components
}

But, Nothing has happened. Is it possible to disable(freeze) the components in my UI automatically after session expires.

michakl asdasdasd

import com.vaadin.server.VaadinSession;
import java.util.Enumeration;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

@WebListener
public class SessionExpireListener implements HttpSessionListener {
    
    @Override
    public void sessionCreated(HttpSessionEvent hse) {
        System.out.println("Session created");
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent hse) {
        System.out.println("Session destroyed");
        Enumeration e = hse.getSession().getAttributeNames();
        while (e.hasMoreElements()) {
            Object o = hse.getSession().getAttribute((String) e.nextElement());
            if (o instanceof VaadinSession) {
                VaadinSession vs = (VaadinSession) o;
            }
        }        
    }
}

anto praveen fathima xavier

where should we add this SessionExpireListener?

Arun Prakash

IMHO, a much cleaner way to do this would be as described in the following article.

https://vaadin.com/wiki/-/wiki/Main/Cleaning+up+resources+in+a+UI

Martin Vyšný

Updated link: https://vaadin.com/docs/v8/framework/articles/CleaningUpResourcesInAUI.html

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Vaadin lets you build secure, UX-first PWAs entirely in Java.Free ebook & tutorial.

Listener for Session Expiration

Vaadin lets you build secure, UX-first PWAs entirely in Java.
Free ebook & tutorial.