Well, while I wasn't able to reproduce the error with other datasources. I was able to fix the problem, by deleting the deleteme-ds.xml.attachments file from the server\default\attachments\ServiceXSLDeployer directory. So that file must have still had the jndi-name as DefaultDS (hence the conflicyt with the Hypersonic datasource), and was not updated when I made the change to the actual deleteme-ds.xml. Mark View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4041920#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...