Cameron, thanks for your comments so far!
Larry and I looked this over carefully, and we believe we may have found a spot in the code where lack of synchronization *may* ultimately result in session loss.
I can explain in more detail if you're interested,
Would it be possible for us to send you a patch in the form of a JAR file for you to try out?
Regarding your other comment about your own app not accessing any session, I'm not sure I understand how your webapp relates to the clusterjsp app.
As a rule of thumb, the web container will never create any HTTP session, unless it is asked to do so. Here's one thing that may seem surprising in this context: If your webapp contains a JSP, a session will automatically be created when the JSP is accessed, unless your JSP explicitly disabled sessions by including a page directive of the form:
<%@ page session="false" %>
By deault, "session" is set to "true".
Thanks,
Jan
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