Just a quick note: storing objects that are not thread safe in your
session is asking for trouble. While Wicket does limit page processing
to one request at a time, other requests like resources can run in
parallel. What does this mean?

One thing that comes to mind is that when two requests for the same
session are being processed, and one is done before the other it will
detach the user model. What are the semantics now for the other
thread?

For instance if you have a detachable model storing a User object in
your session and use Hibernate you are in a world of hurt, or rather
Hibernate will sometimes bork because your Session tries to attach the
single User instance to multiple Hibernate Session objects. Exceptions
will be having a party.

Now this is not meant as a Hibernate bashing reply, it just happens
that Hibernate correctly detects multiple threads modifying the same
object's state and stops tampering with it.

Martijn

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