Gave four stars as I suspect the current scope properly works only for single app per session, right? This is pretty much must for any Vaadin app, even the basic event/listener mechanism in JEE6 is enough to promote this for any Vaadin app. Great add-on!
Yep, current implementation invalidates the session on application close so only 1 app/session is possible at the moment. But most Vaadin apps probably need only one app/session anyway.