Had a similar problem using either RC1 or CVS-version. The format of the file has changed a bit, take a look at http://main.jboss.org/thread.jsp?forum=46&thread=12589, the last post should solve your problems.
Thanks! The example config files for rc1 at http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jboss/jbosscx/src/etc/example-config/ solved my problem as you suggested.
Note: I had to comment out the at the end of the oracle-service.xml