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modify Application to run in clustering environment

 
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Our application is running on JBoss 3.0.3. We are migrating it to run on JBoss 4.0.4 clustering environment.

Some application modules use JDBC to talk to the database. How should I handle the data synchronization issue? For example,

If one request from client A to application to update the firstname, and another request from client B to update the lastname. In this situation how should I keep the updates from those two requests?

Also, if I want the application to run in a highly available environment, what should I consider from application(coding) point of view? I realized this wasn't a simple topic, but a direction will be helpful.

Any advices will be appreciated.

Thank you.
 
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This article will get you started with basic terms/concepts.
 
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