anonymous wrote : org.jboss.resource.JBossResourceException: Could not create connection; | - nested throwable: (java.sql.SQLException: Io exception: | The Network Adapter could not establish the connection) Are you sure that the connection url that you have specified in your datasource (-ds.xml) file is correct? Please post the contents of that file and also post the entire exception stacktrace. Which version of Oracle DB server do you use? While posting the logs or code or xml content, remember to wrap it in a code block using the Code button in the message editor window and please hit the Preview button to make sure your post is correctly formatted View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4190387#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...