First, you should have started a new post, not added your question to the end of an unrelated post. Second, you did not say what you wanted to use the database for. JBoss already uses the Hypersonic database for JMS and a few other tasks, did you want to replace that database? Or, do you have an application that needs a database and you want to set up a database for that application? Finally, did you really mean version 4.0.0 of JBoss AS, or perhaps 4.0.4 or 4.0.5? I ask because 4.0.0 is over two years old. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980069#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...