> The JSP + Servlet API is just a set of interface, so
> potentially any vendor can
> implement them in any manner they feel like. AFAIK all of
> them implement
> session information on a single server basis at the moment
> (anyone know about
> WebSphere or any of the bigger ones?) - i.e. in memory.
The heavy duty commercial app servers generally have some sort
of "persistence" or "state" engine that works in distributed
fashion as required. If it _doesn't_ have this, it's almost
by definition NOT a heavy duty app server, because this is
required in order to implement fault-tolerant load-balanced
systems. However, there's usually a large price tag attached...
Cheers,
Richard.
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