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If your project demands you to persist java objects in any environment (J2EE etc), use standards but switch to any standards such as JDO, EJB, Hibernate anytime,
use default mapping for build from the scratch apps "EasyPersistence" is your solution
AutoSQL provides a simple and easy to use framework meant to be a substitute for J2EE Entity beans and JDO. AutoSQL data objects give just the right abstraction from a writing SQL without being too far removed from the power of SQL.
This is basically a layer for the Object Bridge project that will allow you to use the JDO specs. This project may disappear if it's decided to join it with the OJB project, but for now, it will allow me and whoever else wants to help to get moving.
Lyophilizer helps developers create systems of JavaBeans without worrying about different persistent/transactional/secure back ends. It is evolving into JDO and currently supports JDBC, EJB and in-memory storage.