Hi all! sorry for bothering again about injection. I'm unable to inject a Datasource resource into my EJB. n my EJB I use: @Resource(mappedName="java:jdbc/MyDS") | protected DataSource dataSource; in my .ds file I use the following <jndi-name>jdbc/MyDS</jndi-name> When I try to use the Datasource I get java.lang.RuntimeException: Unable to inject jndi dependency: env/oracle.ejb30.HelloTestBean/dataSource into property oracle.ejb30.HelloTestBean.dataSource: jdbc not bound Should I insert a resource-ref also in jboss.xml ? or in ejb-jar.xml too ?? I really hope I don't need to use ejb-jar.xml anymore since I'm fed up with it.......... Thanks for your feedback....... By the way I'm using JBoss 4.2.x Thanks Francesco View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118566#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...