Hi everyone.

I have a master-detail cadastre (like Employees and their dependents).
My master class is called SuperClasse and my Detail class is called ClasseDetalhe.

So what is happening is that when I am going to update my master class (SuperClasse), i receive this exception message:

net.sf.hibernate.HibernateException: You may not dereference a collection with cascade="all-delete-orphan"

What I am doing to execute this update is that:

- I have a SuperClasse class whit properties updated (but not persistent yet), so I load a original class (a persistent class with the old values) and I copy all values from my new SuperClasse class to my original and persistent SuperClasse class, and commit that.

So, if I have cascade="save-update", it works, but if my new SuperClasse class have a Collection whit not every ClasseDetalhe classes, hibernate puts NULL on ClasseDetalhe ForeignKey for SuperClasse, and what I want it does was delete those ClasseDetalhes that it puts NULL, so I choice cascade="all-delete-orphan".

My hbm.xml's

SuperClasse.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class
name="br.com.softsite.sample.model.SuperClasse"
table="SUPER_CLASSE"
>

<id
name="id"
column="ID"
type="java.lang.Integer"
>
<generator class="hilo">
</generator>
</id>

<property
name="descricao"
type="java.lang.String"
>
<column
name="DESCRICAO"
unique="false"
sql-type="VARCHAR(255)"
/>
</property>

<set
name="theClasseDetalhe"
lazy="true"
inverse="false"
cascade="all-delete-orphan"
sort="unsorted"
>

<key
column="THE_SUPER_CLASSE_FK"
/>

<one-to-many
class="br.com.softsite.sample.model.ClasseDetalhe"
/>
</set>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-SuperClasse.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>


ClasseDetalhe.hbm.xml

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class
name="br.com.softsite.sample.model.ClasseDetalhe"
table="CLASSE_DETALHE"
>

<id
name="id"
column="ID"
type="java.lang.Integer"
>
<generator class="hilo">
</generator>
</id>

<property
name="descricao"
type="java.lang.String"
>
<column
name="DESCRICAO"
unique="false"
sql-type="VARCHAR(255)"
/>
</property>

<many-to-one
name="theSuperClasse"
class="br.com.softsite.sample.model.SuperClasse"
cascade="none"
outer-join="auto"
column="THE_SUPER_CLASSE_FK"
unique="false"
/>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-ClasseDetalhe.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>

I've seen this exception if you read in an object which contains an associated collection... and then update it using something like


This is because when you load a hibernate associated collections, it uses it's own implmentation of Set so that it can keep track of adds and deletes.

It recommends using something like