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From "G. Wade Johnson" <>
Subject Re: Servlet thread safety
Date Mon, 09 Jun 2003 16:43:07 GMT
How about the flip side? Is instance data guaranteed separate for each

I Have some code that relies on instance data and I just had the
horrible realization that I have assumed that no two concurrent
requests will be talking to the same object.

Thanks again,
G. Wade

"Shapira, Yoav" wrote:
> Howdy,
> You didn't miss it.  No such guarantee exists for normal servlets.  See
> the javax.servlet.SingleThreadModel interface for one approach to this
> issue.
> However, many people will tell you to avoid SingleThreadModel for
> various reasons.  I tend to agree.  The design and implementation of
> your servlets should not depend on the synchronization of their service
> methods by the container.  If you have shared resources put them in
> objects (often singletons) outside the servlets.
> Yoav Shapira
> Millennium ChemInformatics
> >-----Original Message-----
> >From: G. Wade Johnson []
> >Sent: Monday, June 09, 2003 12:08 PM
> >To: Tomcat Users List
> >Subject: Servlet thread safety
> >
> >This may be an obvious question, but is there any guarantee one way or
> >the other about whether there is a separate servlet object for each
> >concurrent request.
> >
> >In other words, is there any chance that instance data would be shared
> >between two requests? If so, are we guaranteed if the instance data
> will
> >always be shared between two requests.
> >
> >I didn't see any, but I may just have missed it.
> >
> >G. Wade
> >
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