after being playing with the booking example for one week, I have a few qustion: 1 how does the entity beans map the DB table? 2 are they mapping by name because the entity beans have the same name with the table names? aslo, I found the name of entity property is the same with the column name in the DB, is this necessary? the reason I ask is because I went in to problem when I modified the booking example by using my own DB which has different name with my entity bean. sorry for the stupid qustions, I am still a newbie..:) jason View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960970#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...