Thanks Peter for your interesting, indeed. Yes, it is 4.0.0. I looked for it because I am using EJB 2.0 and I was not sure what version use. This is my *-ds.xml, anonymous wrote : | | <local-tx-datasource> | | <jndi-name>DefaultDS</jndi-name> | <connection-url>jdbc:mysql://localhost:3306/myDB</connection-url> | <driver-class>com.mysql.jdbc.Driver</driver-class> | | <user-name>some user</user-name> | some password | | <!-- | <security-domain>MySqlDbRealm</security-domain> | <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name> | <valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name> | | <new-connection-sql>select * from books</new-connection-sql> | <check-valid-connection-sql>select id from books</check-valid-connection-sql> | --> | | <!-- Typemapping for JBoss 4.0.0 --> | | <type-mapping>mySQL</type-mapping> | | | </local-tx-datasource> | | I took it from the instruction in Jboss.org (http://wiki.jboss.org/wiki/MySQL) Can you see anything wrong? Regarding, Jose Alvarez de Lara View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4151842#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...