I'm a newer to seam.I have creat a seam web project through jboss tools,it almost work very well except that

I can't update my data record.

I use jboss tools creat a seam entity automatically.when I use the extend entityhome class to insert、delete it works well, but when I want to update ,it give me "update succesfully"message,but the data in database maintain unchanged.where is it wrong?any idea will be thankful.