[hibernate-dev] Why do Services need to be Serializable?

I just found this comment on org.hibernate.service.Service: /** * Marker interface for services. * <p/> * NOTE : All services must be {@link Serializable}! * * @author Steve Ebersole */ public interface Service extends Serializable { What kind of bad things will happen to us if violating this recommendation? In OGM we have for example connection pools managed in a Service, we can hardly serialize that. Sanne