I have defined a one-to-one Relationship for model.CatPersistent to the model.PersonPersistent.

<class name="test.Cat" table="CAT">

<id name="id" type="long" unsaved-value="null" >
<column name="ID" not-null="true"/>
<generator class="native"/>
</id>

<property name="name">
<column name="NAME" sql-type="varchar(16)" not-null="true"/>
</property>

<property name="sex"/>

<property name="weight"/>

<one-to-one name="owner" class="test.Person" constrained="true" cascade="all" property-ref="id"/>


</class>

<class name="test.Person" table="person">

<id name="id" type="long" unsaved-value="null" >
<column name="ID" not-null="true"/>
<generator class="native"/>
</id>

<property name="name"/>

</class>


and execute the following code.

Transaction tx1 = session.beginTransaction();

Person owner = new Person();
owner.setName("listopad");
session.save(owner);

Cat princess = new Cat();
princess.setName("Princess");
princess.setOwner(owner);
session.save(princess);

tx1.commit();

two datasets will be inserted in the database, but the owner column from the table cat has value null instead of the id of the inserted person.
the id columns of table person and cat are definded as auto_increment.

Can someone help me to find the failure?

Thanks

If I guess well, you don't want to have the same id between the 2 sides of the one-to-one.
Then remove constrained="true" and recheck the 5.1.11 sample[/code]