Hibernate version:3.1

Mapping documents:
<!-- PERSON -->
<class name="com.generic.model.Person" table="person">
<id name="id" column="id" type="java.lang.Long">
<generator class="increment"/>
</id>

<one-to-one cascade="all"
name="address"
class="com.generic.model.Address"
constrained="true"
/>

<!-- ADDRESS-->
<class name="com.generic.model.Address" table="address">
<id name="personId" column="person_id">
<generator class="foreign">
<param name="property">person</param>
</generator>
</id>
<one-to-one name="person" constrained="true"/>

Hey all

Can anyone help me out with the above mapping? I have omitted some other associations in the Person.hbm.xml file which work flawlessly, but I can't somehow map this unidirectional one-to-one association on a primary key. Whenever I call person.setAddress(....) and then personDao.save(person) I get the following stack trace:


com.generic.dao.exception.DAOException: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property: person


I have read through the Hibernate mapping and that's where I got this mapping solution from. Do I really have to have the line

<one-to-one name="person" constrained="true"/>

in Address.hbml.xml even if I never plan to retrieve Person from Address? That's what's causing the exception - but I'd rather not have a Person property in Address at all.

Thanks!

Any takers on this?

It seems as if Hibernate's one-to-one mapping still is rather weak at this point - as pointed out here: http://forum.hibernate.org/viewtopic.ph ... t=onetoone
Can anyone maybe give me a working example on how you got the generator class "foreign" to work?

Thanks

I have managed to get this to work - I seem to have done exactly as you did. Please make sure, before you test everything, that you re-create the db schema.

My Person mapping contains:

My address mapping contains:


My init code is: