We had an application server meeting last week ;) Yes, looking at the current implementation in Branch_5_x is a good start. And like you said look into refactoring too: 1) No inner classes 2) Use an interface for class variables, so we don't depend on the implementation 3) Create a package for each area - NoTx, Tx, ... 4) Use Java 5 as much as possible (especially java.util.concurrent) Other things to keep in mind is https://jira.jboss.org/jira/browse/JBJCA-30 - but that really ties into 2). Just let me know if you have any questions - we can follow up with design of each area in new threads. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4246231#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...