Hello, Modify your program as given below. session bean InitialContext ctx = new InitialContext(); | DataSource ds = (DataSource)ctx.lookup("java:/OracleDS"); | Connection conn = ds.getConnection(); jboss.xml <resource-ref> | <res-ref-name>java:OracleDS</res-ref-name> | <res-type>javax.sql.DataSource</res-type> | <jndi-name>java:/OracleDS</jndi-name> | </resource-ref> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993014#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...