Which Persistence Specification ?There are several competing persistence technologies available for Java. Two of these are "standardised" (via the JCP). When developing your application you need to choose the most appropriate technology for your needs. Java Data Objects (JDO) has been a standard since 2001 with the release of JDO1. It was improved with the release of JDO2. Just to confuse issues the Java Persistence API (JPA) was
