dilshat, in order to connect to database, you need persistence.xml and jboss-beans.xml. you can find those files in this very topic . but it is better to put your messages in another thread and prevent this topic to be more complex than currently is. I put another topic with subject "How to configure an embedded Ejb to connect to MySql?" you can put your files and codes and any exception message on that topic and I will answer you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980019#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...