Please post more of the stack trace - the first line is not sufficient. From what you posted I cannot tell if the issue is with the JDBC driver (which is what I would guess) or with some code in JBoss (not likely because as you said "The code works fine using Mysql or SQL Server datasources"). Also, what JDBC driver are you using for Oracle? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175634#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...