[jetty-users] Issue with tsessions in 9.4.0

[Silvio Bierman <sbierman@xxxxxxxxxxxxxxxxxx>]

Hello all,

I have been running 9.4.0 (embedded mode) in our production environment 
for a couple of days now and started to notice high session counts in 
our monitoring screens.

To track sessions we add an attribute value that extends 
HttpSessionBindingListener that registers the session during valueBound 
and unregisters it during valueUnbound.

The session registry keeps track of the total number of sessions created 
and destroyed. The difference is shown as the number of active sessions. 
I now observe an ever increasing count of active sessions. It seems that 
valueUnbound is called in only about 45% of the cases.

I managed to reproduce this in my dev environment. I can confirm 
invalidate is called on the session but valueUnbound is not called on 
the tracking object. Reverting to 9.3.13 solves the issue.

Perhaps I am doing something wrong in my server setup. But since 
valueUnbound is called in about half the cases I suspect something else 
is wrong. Any ideas?

Thanks,

Silvio