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Warning to a client about data changes.  RSS feed

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I'm building a system where the clients could be Java GUI Applications and Java Web Applications. I'm going to use Weblogic 6.1 SP1 as the AS.
The technologies to be used are EJB 2.0, Servlets, JSP, JMS, etc.
The issue is that I have to manage the concurrency between readers and writers. I mean, if a client make a query, and get some data from the DB, and if meanwhile the data are in the screen, another client modify the information
-thru an EntityBean-, I have to warn the reader client about the changes.
Somebody knows about some technology (from Weblogic, or a third party product), that permit me do that?
Thanks in advance.
[ May 22, 2002: Message edited by: Cristian Cardenas ]
Don't get me started about those stupid light bulbs.
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