Github user bitstorm commented on the issue:
https://github.com/apache/wicket/pull/233
I see. thank you for the clarification. Still, I'd like to evaluate more
structural solutions, at least for Wicket 8. A good start point might be
HttpSessionStore.SessionBindingListener#valueUnbound.
It's already used to call Session#onInvalidate and we can add
Session#clear() after it.---
