>  Now I have changed that back to 10 minutes. It
> doesn't explain the sudden outburst of OutOfMemoryErrors in the logs

You imply that the OOM errors started when you increased the session
timeout.  There is certainly a cause-effect relationship between a 4hr
session timeout and memory usage.  Please correct me if the errors do
not correlate with this change.

> nor does it explain why the TicketRegistryCleaner is running so often.

Based on the Spring context snippet you shared, the cleaner should run
every 83 minutes, which is clearly not the case based on the
corresponding logs.  Can you tell us more about your systems
architecture; for example, are these clustered machines logging to a
single file or other repository?  Also, what ticket registry are you
using?

M

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