Java Data Objects (JDO)^TM offers powerful object-relational persistence. It offers (according to its advocates) an alternative to apparent limitations of the Enterprise Java Beans (EJB) technology of Java 2 Platform, Enterprise Edition (J2EE). I'm no J2EE or EJB expert, I just know that Java Data Objects (JDO)^TM is the bees knees, having used it on substantial modelling projects as illustrated below. More examples of my work with Java Data Objects (JDO)^TM will appear here as time permits, modelled in Unified Modelling Language (UML)^TM.

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Example: a clone in MagicDraw UMLTM of a Java Data Objects (JDO)TM state diagram from Java Data Objects by Robin Roos

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Example: a Java 3DTM model of the MOST radiotelescope persisted by Java Data Objects (JDO)TM

Useful JDO links:

• Java Data Objects by Robin Roos (available as PDF download, fantastic and generous, thanks Robin !)
• KODO JDO: a commercial high-performance implementation with great documentation.
• TriActive JDO (TJDO) the open source implementation of Sun's JDO specification (JSR 12) that I used for the radiotelescope project. You're on your own a bit for docs.
• The EJB/JDO Persistence FAQ