EJBs are no doubt scalable. Usually you access data using

1. CMP
2. BMP
3. Sessions beans with JDBC.

Compare it to DAO that can help you to form your own persistence mechanism and policy 
not only to RDBMS but to any kind of data store. be it XML/file system. But CMP/BMPs 
can't help you with that as they stick only to RDBMS.

cant remmeber the link but there was some article related to what you are looking at 
serverside.com

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