Logout question - Session Already Invalidated

[LOCHART,DOUGLAS E]

I implemented the listener approach to logging out as 
reccomended by the FAQ on the Tapestry Wiki.  I used this 
approach to give the user an option to continue or to 
cancel out and to do some logging.

Occasionally I have received a ServletException "Session 
Already Invalidated".  I found a blurb somewhere on the 
net that mentioned do a restart like this:
 
public void logout(IRequestCycle cycle)
{
    IEngineServiceView engine = 
  (IEngineServiceView)getEngine();
    engine.restart();
}

in a listener is bad because the page will still render 
and could cause this exception.  However the responder did 
not give a clear alternative as to what to do.

So I again I must ask the Tapestry Gods ..... HELP
What is the best way to handle a logout CLEANLY that 
terminates the session?  

Please give an example if its not a simple one.
Thanks again to all,
Doug
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