Hibernate version: 2.1

Mapping documents:

Project class:

<hibernate-mapping package="Metier">
<class name="Projet" table="PROJET">
<id
column="IDPROJ"
name="Idproj"
type="integer"
>
<generator class="vm" />
</id>
<property
column="DATEDEB"
length="10"
name="Datedeb"
not-null="false"
type="date"
/>
<property
column="DATEFIN"
length="10"
name="Datefin"
not-null="false"
type="date"
/>
<property
column="DESCRIPTION"
length="250"
name="Description"
not-null="false"
type="string"
/>
<property
column="DESIGNATION"
length="50"
name="Designation"
not-null="false"
type="string"
/>

<many-to-one
class="Budget"
name="Idbud"
not-null="true"
>
<column name="IDBUD" />
</many-to-one>
<set inverse="true" name="RISQUESet">
<key column="IDPROJ" />
<one-to-many class="Risque" />
</set>
<set inverse="true" name="PROCESSUSSet">
<key column="IDPROJ" />
<one-to-many class="Processus" />
</set>
<set inverse="true" name="METRIQUESet">
<key column="IDPROJ" />
<one-to-many class="Metrique" />
</set>
<set inverse="true" name="ITERATIONSet">
<key column="IDPROJ" />
<one-to-many class="Iteration" />
</set>
</class>
</hibernate-mapping>


Iteration classes :

<hibernate-mapping package="Metier">
<class name="Iteration" table="ITERATION">
<id
column="IDIT"
name="Idit"
type="integer"
>
<generator class="vm" />
</id>
<property
column="DATEDEB"
length="10"
name="Datedeb"
not-null="false"
type="date"
/>
<property
column="DATEFIN"
length="10"
name="Datefin"
not-null="false"
type="date"
/>
<property
column="NUMERO"
length="10"
name="Numero"
not-null="false"
type="integer"
/>

<many-to-one
class="Projet"
name="Idproj"
not-null="true"
>
<column name="IDPROJ" />
</many-to-one>
<set inverse="true" name="METRIQUESet">
<key column="IDIT" />
<one-to-many class="Metrique" />
</set>
<set inverse="true" name="TACHESet">
<key column="IDIT" />
<one-to-many class="Tache" />
</set>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():
Session session = HibernateUtil.currentSession();
Transaction tx = session.beginTransaction();

Projet proj = new Projet(new Integer(0));
proj.setDesignation("projet qui pue");
Iteration it = new Iteration(new Integer(0));
proj.addToITERATIONSet(it);
session.save(it); // i try whith this line and whithout
session.save(proj);
tx.commit();

Full stack trace of any exception that occurs:
no execption throwed

Name and version of the database you are using:
Pointbase (with the j2ee 1.4)

The generated SQL (show_sql=true):
Hibernate: insert into ITERATION (DATEDEB, DATEFIN, NUMERO, IDPROJ, IDIT) values (?, ?, ?, ?, ?)
Hibernate: insert into PROJET (DATEDEB, DATEFIN, DESCRIPTION, DESIGNATION, IDBUD, IDPROJ) values (?, ?, ?, ?, ?, ?)


Comment:
The project class had a collection (set) of Iteration, when i had an iteration to the project , when i look into the database, the iteration foreign key refering the project id is null
Is someone can help me ??

You also have to set the Project on the Iteration if you aren't doing that already.

i.e. your addToITERATIONSet(it) method should look something like this

iterationSet.add(it);
it.setProject(this);

Otherwise your Iteration has no knowledge of your project. I'm sure it's all covered in the reference docs. Read up on bidirectional associations.