jUDO : Java Universal Data Objects

jUDO is short for "java Universal Data Objects" and speeds up development/maintainence and remove database-vendor dependency for applications using databases. You should use jUDO whenever you don't want to use EJB's. It will also work for .NET in a near future.
You don't write ANY database-code ,you only have to specify the container classes and the Interfaces for the Models and then jUDO creates the implementation for you runtime, no source is generated!!! It derives all info need to by your Interfaces method names ,that follows name-pattern rules. In case you need some special access method you either add a plugin for this or simply go directly against the database.

For more: http://judoo.sourceforge.net/