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Hibernate mapping doubt

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Hi everybody. I'm new on Java world and Hiernate. Since I'm working on a project that must be delivered soon, I haven't got too much time for reading books or documentation about Hibernate. I believe my question is simple.

1) Tables: Sql Server 2005

Hibernate hbm mapping files (Havent seen how to do that using Annotations)


The code:

When I execute, I got this error:

Hibernate: insert into father (father_descr) values (?)
Hibernate: insert into child (father_Id, child_descr) values (?, ?)
4875 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 515, SQLState: 23000
4875 [main] ERROR org.hibernate.util.JDBCExceptionReporter - Cannot insert the value NULL into column 'father_Id', table 'TesteHibernate.dbo.child'; column does not allow nulls. INSERT fails.
org.hibernate.exception.ConstraintViolationException: could not insert: [child]

I always thougt that Hibernate should know that when saving the father, it should use the father id (generated by sql server) as a value for the column child_id automaticaly, i mean by itself.

Why I must save the Father, set child_id in class child with the father_id and after call update (as above)?

Thanks in advance, and excuse me my poor English
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