How to show custom session expired dialog in Jmix (similar to CUBA)?

Support
#1

Hello Jmix team!
In CUBA applications, when the user’s session expires (for example, when the same user logs in from another browser), a notification dialog is shown automatically:

  • It displays a message like “Session has expired. Please log in again.”
  • It has an OK button that redirects the user back to the login page.

In Jmix (Vaadin Flow), by default, when the session expires, I see a technical message like:
image

I want to implement the same behavior as in CUBA:

  • Show a user-friendly dialog
  • Provide an OK button that redirects the user to /login.

I use Jmix v.2.6.1

#3

Hello!

Vaadin provides a mechanism to customize session expired messages: How to customize system messages in Vaadin.

Example from Vaadin docs:

@Component
public class CustomInitServiceListener implements VaadinServiceInitListener {
    @Override
    public void serviceInit(ServiceInitEvent event) {
        event.getSource().setSystemMessagesProvider(new SystemMessagesProvider() {
            @Override
            public SystemMessages getSystemMessages(SystemMessagesInfo systemMessagesInfo) {
                CustomizedSystemMessages messages = new CustomizedSystemMessages();
                messages.setSessionExpiredCaption("Session expired");
                messages.setSessionExpiredMessage("Take note of any unsaved data, and click here or press ESC key to continue.");
                messages.setSessionExpiredURL("login");
                messages.setSessionExpiredNotificationEnabled(true);
                return messages;
            }
        });
    };
}

To customize visual representation of notification use .v-system-error selector.

#4

Thank you very much for your help! The solution worked perfectly in my project.

#5

Hi again,

Thanks for the previous suggestions. I have a follow-up question regarding the “Session Expired” notification:

Currently, the notification appears even if the user manually logs out from their own browser, which I don’t want.

My requirements are:

  • The notification should appear only if another browser/session logs in.
  • Specifically, it should trigger only when there are 2 active users (or sessions) at the same time.
  • It should not appear if the user logs out from their own browser.

How can I implement this behavior in Jmix? Is there a way to track multiple active sessions per user and distinguish between self-logout and “logged in from another browser”?