The @Resources annotation makes it possible to define resources that you are going to lookup at runtime in your EJB. The example describes a way to lookup a datasource that is mentioned in the @Resources annotation on the class.
@Resources(value={
@Resource(name="ShoppingCartDB", type=javax.sql.DataSource),
@Resource(name="ShoppingCartMail", type=javax.mail.Session)
})
@Stateful
public class ShoppingCartBean {
@Resource
SessionContext ctx;
public List getItems() {
DataSource shoppingCartDB = (DataSource) ctx.lookup("ShoppingCartDB");
Connection conn = shoppingCartDB.getConnection():
return null;
}
}