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This is a discussion thread for CleanupServlet Add-on, which provides you with background threads for ensuring session cleanup (and optionally UI cleanup). Current version adds one such thread per session.
Doesn't work out of the box, I'm afraid. Would need to extend VaadinSpringCleanupServlet in similar ways. Could be a worthwhile addition if I only managed to find some time for it, haven't had had many opportunities to play around with that yet.