I would like to know what config file is used by JBoss3.0RC2 to specify the JdbcProvider and DataSourceLoader. In the 2.x versions, this would be defined in jboss.jcml under "Jdbc". In 3.0RC2, there is no such file in existence.
Those 2 mbeans are gone forever and not missed. The default hsqldb config is in hsqldb-service.xml. Examples for many other dbs are in docs/examples/jca. There's a FAQ and a lot of discussion on the jca forum if you have trouble after following the instructions in the example config files. There is also documentation in docs/jmx-api.