JPOX provides transparent persistence of Java objects. It is a compliant implementation of the JDO1.0, JDO2.0, JDO2.1 and JPA1.0 specifications. It supports persistence to all of the major RDBMS on the market today, as well as to DB4O datastores. It allows querying using either JDOQL, SQL or JPQL. JPOX 1.1.0 is the Reference Implementation(RI) for JDO 2, and JPOX 1.2.0 is the RI for JDO2.1. It uses OSGi technology for its plugin framework