DataNucleus
DataNucleus is an open source project which provides software products around data management in Java. The DataNucleus project started in 2008.
DataNucleus Access Platform is a fully compliant implementation of the Java Data Objects 1.0, 2.0, 2.1, 2.2, 3.0, 3.1, 3.2 specifications and the Java Persistence API 1.0, 2.0, 2.1, 2.2 specifications, providing transparent persistence of Java objects. It supports persistence to the widest range of datastores of any Java persistence software, supporting all of the main object-relational mapping patterns, allows querying using either JDOQL, JPQL or SQL, and comes with its own byte-code enhancer. It allows persistence to relational datastores, object-based datastores, document-based storage, web-based storage, map-based datastores, graph-based datastores, document stores as well as other types of datastores. Its plugins are OSGi-compliant so can be used equally in an OSGi environment.
DataNucleus Access Platform is also utilised by the persistence layer behind Google App Engine for Java, and VMForce.
