Is any JDBC driver available that can access EDI messages?

I don't know about existing drivers, but JavaPro had a good article on writing your own driver. The example was a driver to access XML files. check it out at JavaPro December, 2001.

Joe Sam Shirah adds: There are also a number of resources for EDI <----> XML conversion. We don't make recommendations, but m-e-c eagle is an open source integrattion suite with such converters you can review. A good search engine will probably show more.