please find Jacob version 0.35 at http://www.JDBMS.ORG
Jacob is a database and IDE coded in Java(TM).
It's a GNU GPL open source project.
New in version 0.35 is the first version of a multi-site version control system (VCS).
It uses the replication and versioning features of Jacob to replicate directory trees. The respective files are loaded into Java(TM) objects, which are then stored in a central server database. Participants of the system can download new file objects from the server database to their local database and check them out.