You never said you were using DB2. Your post mentioned only Hypersonic so I assumed that is what you were using. Do you have a *-ds.xml file for the DB2 database? What is the jndi-name for the data source? If you set it to DefaultDS, then you should remove hsqldb-ds.xml. If it is some other name, then your application is using the wrong name. (My preference is to use another name and leave DefaultDS pointing Hypersonic.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979404#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...