String mappedUnsavedValue = mappedEntity.getIdentifier().getNullValue();
Type type = mappedEntity.getIdentifier().getType();
Property property = mappedEntity.getIdentifierProperty();
IdentifierValue unsavedValue = UnsavedValueFactory.getUnsavedIdentifierValue(
mappedUnsavedValue,
getGetter( property ),
type,
getConstructor(mappedEntity)
);