In your application, how are you accessing the database? Directly via JNDI or are you using a data source defined within Tomcat? If the former, you don't have to make any changes (well, you do need to copy the JDBC driver jar file to the server/default/lib directory). If the later, you need to create a *-ds.xml file to define the data source, and copy it to the server/default/deploy directory (and put the JDBC driver jar file in the server/default/lib directory). Several example *-ds.xml files, for various databases, can be found at ./docs/examples/jca. And the documentation is at http://docs.jboss.com/jbossas/guides/j2eeguide/r2/en/html_single/#ch7.jdb... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996344#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...