UserSessionExpiryListener incompatible with certain application servers

Most notably servers that invalidate sessions before they get passed to the session listener. (tomcat is one example)

This is the stack trace that normally appears in the logs:

2006-01-05 13:20:25 StandardManager[] Session event listener threw exception
java.lang.IllegalStateException: getAttribute: Session already invalidated
at org.apache.catalina.session.StandardSession.getAttribute(StandardSession.java:953)
at org.apache.catalina.session.StandardSessionFacade.getAttribute(StandardSessionFacade.java:171)
at com.atlassian.confluence.user.listeners.UserSessionExpiryListener.sessionDestroyed(UserSessionExpiryListener.java:28)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:658)
at org.apache.catalina.session.StandardSession.expire(StandardSession.java:607)
at org.apache.catalina.session.StandardManager.processExpires(StandardManager.java:793)
at org.apache.catalina.session.StandardManager.run(StandardManager.java:870)
at java.lang.Thread.run(Thread.java:534)