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From Tim Funk <>
Subject Re: javax.servlet.http.HttpSession.getId() returns null
Date Wed, 03 Sep 2003 10:47:46 GMT

Johann Uhrmann wrote:

> Johann Uhrmann wrote:
>> Hello,
>> I am writing a single-sign-on filter that uses cookies and
> after reviewing my logs, it seems that session objects are being
> recycled by the server and the id is set to null while they are
> not in use.
> Is that correct?
I think so. But in tomcat5 - I think think pooling is not done.

> Is there a docu that shows what objects are pooled in Tomcat so
> application developer can consider the side-effects of pooling?

Not that I know of.

> In my case, I held references to session objects and it seems that
> the id changed over time. That behaviour broke my filter design
> and was hard to track down.
Since sessions may also passivate to some persistent store such as a file or 
database or ??? you had a good chance at having problems in the future anyways.


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