Whilst DataNucleus JDO/JPA already supported persistence and querying of objects to/from RDBMS (all variants), ODBMS (NeoDatis), Documents (XML, Excel, ODF), Web (JSON), Document-based (MongoDB), Map-based (HBase, AppEngine, Cassandra), as well as others like LDAP and VMForce, it was clear that we didn’t yet have a plugin to any of the nice new graph datastores like Neo4j. To this end, there is now a new store plugin, supporting persistence to Neo4j.