Hi all. I know how to create a datasource in JBoss but I have a question... my jbosscmp-jdbc.xml file contains : <defaults> <datasource>java:/MySqlDS</datasource> <datasource-mapping>mySQL</datasource-mapping> </defaults> and mysql-ds.xml file contains : <jndi-name>MySqlDS</jndi-name> <connection-url>jdbc:mysql://localhost:3306/LigaDB</connection-url> my deploy dir contains more than one EJB application, and each application requires a datasource. all I need to do is : create an XML file called : app1-ds.xml for the first application app2-ds.xml for the second application ...... and ofcourse setting <connection-url> element correctly. and I don't need to change defaults element of jbosscmp-jdbc.xml file, neither <jndi-element> am I right ??? thanks.