> Hello All --
>
> I am trying to use JSPs & servlets in a clustered environment as
> the middle
> tier of
> a three-tier application; the backend is an EJB server running against an
> Oracle database. The current idea (but this is flexible) is to put a
> separate instance of JRun on each web server. So far, so good.
Which EJB server? Just wondering... :)
> The problem is that I want use the servlet session tracking API; to my
> dismay, I just found out that our load balancing hardware cannot guarantee
> that successive calls from the same client will go to the same web server.
> So an HttpSession object in any particular instance of JRun is
> useless if it
> is unknown whether that client has already established a session with
> another instance. AFAIK, JRun cannot be set up to automatically manage
> sessions in a cluster. If this is incorrect, I would appreciate a quick
> slap in the face and a pointer to the appropriate documentation.
> Also, any
> pointers to servlet/JSP engines that do support this behavior would be
> helpful.
BEA WebLogic supports an environment where you can do this, except you don't
need the load balancing hardware.
WebLogic Routing Servers --> WebLogic Servlet Engines --> EJB Servers
or even the more abbreviated set up:
Routing Server --> WebLogic Servlet/EJB Server
Additionally your sessions can be fault-tolerant with either in-memory
replication or persistent replication.
Sam
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