Projects / ObJectRelationalBridge


ObJectRelationalBridge (OJB) is an Object/Relational mapping tool that allows transparent persistence for Java objects against relational databases. It supports multiple persistence APIs, including JDO, ODMG, and several custom alternatives.

Operating Systems

Recent releases

  •  01 Jul 2004 11:47

    Release Notes: Some issues in the last release candidate were fixed. No major feature changes were implemented.

    •  11 Jun 2002 17:01

      Release Notes: A JDO prototype and a working sample application were implemented. A new Servlet Implementation allows you to easily deploy the OJB Server as an HTTP-Servlet. Full JTA and JCA integration is in place.

      •  04 Apr 2002 10:23

        Release Notes: OJB now supports the JTA Transaction API which allows easy integration into J2EE App Servers. This release has also added a reverse engineering tool that helps to build mapping repositories for existing database tables.

        •  06 Jan 2002 11:20

          Release Notes: OJB now supports transparent mapping of M:N relations. Transparent assignment of foreign key values is now also supported. Proxies for lazy loading of Collections have been implemented. The Query API now supports Path expressions, which are translated to SQL JOIN statements internally. The Exception handling has been improved.

          •  24 Nov 2001 21:15

            Release Notes: This release provides mapping support for m:n associations. The Proxy mechanism has been made available for JDK1.2 by means of a replacement of the JDK1.3 dynamic proxies. The documentation has improved a lot.


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