After reading the message in this thread, I think people are making a
simple problem too complex. Even I would stay away from EJBs and stuff just
for the sake of caching. We use a caching toll called "oscache". It does
exactly what the original poster wants.

Oscache uses javagroups underneath for messaging. It works for me in a
clustered environment perfectly for me. Basically what OsCache does is: It
sends notifications to all servers that are bind to a particular address,
when a particular object in a cache (lets say on server1) is flushed. This
notification flushes the same object in each server's cache. That way stale
date is flushed in all servers.

Its very simple to use and I think it solves the exact problem.

You can look at oscache at http://opensymphony.com/oscache/. The tool can
also use JMS for sending notifications.

Praveen

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