I think that will be good if it haves the advise of the need of put the cascade
parameter on associations to cause the saving cascade effects on the child entitys.
Also, I think that will be good if it haves too the advise of the need of maps the
entities which are subclasses of entities to use them.
Also, the orphanRemoval parameter not worked without the parent entity update operation
with Hibernate native apis. This seems to be unlike that that is on Documentation.