I realized that when persisting Model subclass, Hibernate will throw HibernateSystemException: Unknown Entity.

For cases like:

User - Model Name

UserForm - extends User

When calling userManager.createUser((User) userForm), will not be allowed.

I know this can be easily solved through other means. Just want to confirm if there is workaround/config/setting somewhere to allow Hibernate to accept subclasses of Peristent class.

what does userManager.createUser do? I'm not sure I understand your question ... ;)

Sovled my own problem. Should have checked the javadoc fore more info. Can actually use other save method.

session.save(String entityName, Object object);

entityName = User class name.