I generate java classes using hibernate tools from hbm.xml files. I would like to manually put business logic in these domain classes. When I make change to hbm.xml and regenrate these classes I do not want loose the business logic I manually put in.

1) Is there way to generate classes or just changes in hbm.xml without lossing the manual changes.
2) Any other better option?

_ Ashish.

There is no way to merge output from H Tools w/ previously existing code. If you wish to continue generating POJOs w/out losing your logic, place it in the Controller, not the Model.