not implemented right now, how would you solve conflicts?


Filip

-----Original Message-----
From: Mike Duffy [mailto:[EMAIL PROTECTED]
Sent: Friday, April 09, 2004 5:48 PM
To: Tomcat Users List
Subject: Clustering Application Scope Objects


I've read documentation for The Tomcat 5 Servlet/JSP Container:
Clustering/Session Replication HOW-TO
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/cluster-howto.html

I understand clustering for individual user sessions.  Are there any
correlated methods for
clustering application scope objects?

The J2EE API for the Interface ServletContext states, "In the case of a web
application marked
"distributed" in its deployment descriptor, there will be one context
instance for each virtual
machine. In this situation, the context cannot be used as a location to
share global information
(because the information won't be truly global). Use an external resource
like a database
instead."

Rather than use a database, what I would like to be able to do is make a
call to

    servlet.getServletContext().setAttribute(key, object);

and have the object stored in the application scope of all servers in the
cluster.

I know that EJBs were designed to serve this purpose; however, I would like
to bypass the overhead
and complexities of EJBs.

If there isn't a switch that can be flipped in Tomcat, there might be a way
to create a
lightweight JMS administration class to serve this purpose.  Has anyone
tried this?

If the answer to this question is RTFM, please send a link; I've looked
through the documentation
and I can't seem to find a clear reference.

Thanks for your time and consideration.

Mike




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