Hi, I am having difficulties with inheritance in hibernate. I have two classes mapped on a table per subclass hierarchy. The two classes are BillingDetails and CreditCard with CreditCard inheriting from BillingDetails. The problem is the following: I have saved an object of type BillingDetails, then I copy its properties to a CreditCard object and when I try to save and update the CreditCard object Hibernate throws an org.hibernate.StaleObjectStateException

Can anyone give me an idea of how to have a BillingDetails at first, and then make it become a CreditCard object.

Thanks in advance...

make a Constructor CreditCard(BillingDetails), which does not set the id.

load BillingDetails; construct CreditCard; delete BillingDetails; save CreditCard.

Thanks for taking some time to help me out... I will try this solution and see how it works... Many thanks...