java.lang.IllegalStateException: getCreationTime: Session already invalidated

[Bacon Serker <ba...@hotmail.com>]

Hello,
We've recently upgraded several servers from 5.0.28 to 5.5.9.  We're now 
seeing intermittent occurances of
java.lang.IllegalStateException: getCreationTime: Session already 
invalidated

Our code caches sessions in a threadlocal at the beginning of the request.  
When code attempts to get the session out of the threadlocal, we call 
getCreationTime on the session, as an effort to ensure the session has not 
timed out/somehow become invalid.  This has worked well for us for years, in 
the 5.0.x releases and I think even the 4.1.x releases.  On 5.5, it seems to 
arbitrarily throw the IllegalStateException mentioned above.  However, 
hitting the same page again w/ the same session by reloading the browser 
will work - so the session has become valid again!  I cannot reproduce the 
problem by hitting the same sequence of pages again - it truly seems to be a 
random occurance.

Any help on this matter would be greatly appeciated.

Bacon Serker

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