Replicate user authentication state in cluster #5181
Description
See forum topic
When Server A goes down, the user should seamlessly continue working on Server B without re-login. We understand that Vaadin’s server-side UI state (component trees, view state) cannot be replicated between nodes. That’s acceptable — we’re fine with the page reloading. But at
minimum, the authentication and authorization state (user principal, security context, roles/permissions) must survive failover so the user doesn’t have to re-login.