Hello...
i'm trying to use a simple one to one mapping but i had an exception when
i try to save a new instance of my object "Figlio", my settings are:

Hibernate version:
3.1.3

Mapping documents:
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping

>

<class
name="it.atscom.nes.model.Figlio"
table="FIGLIO"
>

<id
name="idFiglio"
column="ID_FIGLIO"
>

<!-- The generator-class attribute of @hibernate.id is deprecated, use the @hibernate.generator tag instead -->
<generator class="foreign">

<!-- The generator-param tag is deprecated, use the @hibernate.generator and @hibernate.param tags instead -->
<param
name="property"
>
padre
</param>

</generator>

</id>

<one-to-one
name="padre"
constrained="true"
>

</one-to-one>

<property
name="descrizione1"
column="DES_FIGLIO_1"
length="50"
not-null="true"
>

</property>

<property
name="descrizione2"
column="DES_FIGLIO_2"
length="50"
not-null="true"
>

</property>

</class>

</hibernate-mapping>


<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping

>

<class
name="it.atscom.nes.model.Padre"
table="PADRE"
>

<id
name="idPadre"
column="ID_PADRE"
type="java.lang.Long"
>

<!-- The generator-class attribute of @hibernate.id is deprecated, use the @hibernate.generator tag instead -->
<generator class="native">

</generator>

</id>

<one-to-one
name="figlio"
>

</one-to-one>

<property
name="descrizione"
column="DES_PADRE"
length="50"
not-null="true"
>

</property>

</class>

</hibernate-mapping>


Code between sessionFactory.openSession() and session.close():
Figlio figlio = new Figlio();
figlio.setDescrizione1("aaaa");
figlio.setDescrizione1("bbbb");

Padre padre = (Padre) dao.getObject(Padre.class, new Long(rb
.getString("padre.get.idPadre2")));

figlio.setPadre(padre);

dao.saveObject(figlio);

public class BaseDAOHibernate extends HibernateDaoSupport implements DAO {
protected final Log log = LogFactory.getLog(getClass());

/**
* @see it.atscom.nes.dao.DAO#saveObject(java.lang.Object)
*/
public void saveObject(Object o) {
getHibernateTemplate().saveOrUpdate(o);
}


Full stack trace of any exception that occurs:
[junit] Testcase: testInsertFiglioFromPadre(it.atscom.nes.dao.OneToOneDAOTest): Caused an ER
ROR
[junit] Unable to resolve property:
[junit] padre
[junit] ; nested exception is org.hibernate.HibernateException: Unable to resolve proper
ty:
[junit] padre
[junit]
[junit] org.springframework.orm.hibernate3.HibernateSystemException: Unable to resolve property:

[junit] padre
[junit] ; nested exception is org.hibernate.HibernateException: Unable to resolve proper
ty:
[junit] padre
[junit]
[junit] org.hibernate.HibernateException: Unable to resolve property:
[junit] padre
[junit]
[junit] at org.hibernate.tuple.EntityMetamodel.getPropertyIndex(EntityMetamodel.java:352)
[junit] at org.hibernate.tuple.AbstractEntityTuplizer.getPropertyValue(AbstractEntityTuplize
r.java:279)
[junit] at org.hibernate.persister.entity.AbstractEntityPersister.getPropertyValue(AbstractE
ntityPersister.java:3252)
[junit] at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:39)
[junit] at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSav
eEventListener.java:91)
[junit] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrReque
stedId(DefaultSaveOrUpdateEventListener.java:186)
[junit] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(Defaul
tSaveOrUpdateEventListener.java:175)
[junit] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(Defa
ultSaveOrUpdateEventListener.java:98)
[junit] at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSa
veOrUpdateEventListener.java:70)
[junit] at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:502)
[junit] at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:494)
[junit] at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:490)
[junit] at org.springframework.orm.hibernate3.HibernateTemplate$18.doInHibernate(HibernateTe
mplate.java:690)
[junit] at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.ja
va:365)
[junit] at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTempla
te.java:687)
[junit] at it.atscom.nes.dao.hibernate.BaseDAOHibernate.saveObject(BaseDAOHibernate.java:28)

[junit] at it.atscom.nes.dao.OneToOneDAOTest.testInsertFiglioFromPadre(OneToOneDAOTest.java:
66)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[junit] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[junit] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java
:25)
[junit] Test it.atscom.nes.dao.OneToOneDAOTest FAILED

Name and version of the database you are using:
Oracle 9i

The generated SQL (show_sql=true):
[junit] ------------- Standard Output ---------------
[junit] Hibernate: select padre0_.ID_PADRE as ID1_88_1_, padre0_.DES_PADRE as DES2_88_1_, figlio
1_.ID_FIGLIO as ID1_89_0_, figlio1_.DES_FIGLIO_1 as DES2_89_0_, figlio1_.DES_FIGLIO_2 as DES3_89_0_
from PADRE padre0_ left outer join FIGLIO figlio1_ on padre0_.ID_PADRE=figlio1_.ID_FIGLIO where padr
e0_.ID_PADRE=?
[junit] ------------- ---------------- ---------------

Any suggestions?

this belongs in the Hibernate users discussion, but the mapping appears correct...