Hi there,

I have a persistent class eg.orm.A with a nonpersistent wrapper subclass eg.bl.AWrapper, which I created to contain business logic methods and some (nonpersisted) fields. When I try to save an instance of the subclass as follows:



I get . This happens even if I try to cast it to the mapped superclass A.

In the past I've gotten around this problem by having AWrapper encapsulate rather than extend A. In this case, though, A has so many fields that I'd rather not if I can avoid it. I don't want or need to make AWrapper persisent.

Any suggestions?

Thanks in advance,
Eric

Hi,


I've solved this issue in the past by using the "Table per class hierarchy" inheritance mapping.

See: http://www.hibernate.org/hib_docs/v3/re ... leperclass

For your example you will have to create another column in your database with a unique value for each class that you want hibernate to map and will have to add some lines to your mapping file but after that you will have a clean biz object (won't have all the setters and getters) that you can toss over to hibernate to put into the db for you.

If you want some sample code let me know and I'll try to get some time to post some.

BTW: This seems like a hack but it worked for me.

Joe