Thanks for your reply. I am struggling getting the xa-datasource to work. Current state: <xa-datasource> <jndi-name>MySqlDS</jndi-name> <xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class> <xa-datasource-property name="Url">ourUrl/schema</xa-datasource-property> <xa-datasource-property name="User">User</xa-datasource-property> <xa-datasource-property name="Password">Password</xa-datasource-property> </xa-datasource> is giving me this kind of error: 2007-05-16 14:17:28,078 ERROR [org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory] End transaction failed for XAResource com.mysql.jdbc.jdbc2.optional.MysqlXAException: XAER_INVAL: Invalid arguments (or unsupported command) at com.mysql.jdbc.jdbc2.optional.MysqlXAConnection.mapXAExceptionFromSQLException(MysqlXAConnection.java:564) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046120#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...