anonymous wrote : Anywhere I have read that Derby needs "PERSISTENCE.XML" The persistence.xml is required if you have a JPA project where you are persisting the entities through Java Persistence API. Without knowing more about your application, i am not sure if you really need it in your application. The persistence.xml you posted does not look correct: <?xml version="1.0" encoding="UTF-8"?> | | <persistence-unit name="FINCAEVT"> | <jta-data-source></jta-data-source> | | </persistence-unit> It has an empty datasource value. I guess, you wanted: <jta-data-source>java:DerbyDS</jta-data-source> where java:DerbyDS is the jndi name of your datasource. This way, you point your persistence unit to the datasource which holds the information about the username/password and other database related information. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233285#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...