DataNucleus is a project providing Open Source software for use in the Java language, for persisting objects to datastores.
DataNucleus AccessPlatform 1.0 (Faraday) was released on September 1st 2008, providing JDO/JPA persistence to RDBMS, db4o, XML, Excel, LDAP, NeoDatis and JSON datastores.
DataNucleus AccessPlatform 1.1 (Rutherford) development started soon after and will build on the support in 1.0, aiming at migrating the RDBMS query support to use the new generic query mechanism, as well as moving to a JDK 1.5+ environment.
As with the majority of Open Source software, DataNucleus is freely downloadable. Limited amounts of free support is available by our forum. We do also provide commercial support, and by purchasing this you are keeping the project going.