i have checked the hsqldb-ds.xml and found out that the user name is "sa". what's the otherwise reason for happen this?? thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987754#3987754 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3987754