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CDI UI Scope never cleaned up although UI detached?
Michael, thanks for your help. That was interesting, but my issue was a little different since the CDI UI and the last active CDI View were never cleaned up, even after session expiry.
The cause was a very simple mistake. But since others might also stumble into it, I want to share it:
At some point in the project, somebody introduced a custom servlet in order to add a BootstrapListener and configured it in the web.xml.
Unfortunately, this custom servlet was not derived from VaadinCDIServlet (which is used by default with CDI), but from VaadinServlet which - of course - does not care about cleaning up contextual resources...
A litle warning during startup would however have been very helpful (at least I haven't seen one)...