Cascade delete in hibernate 3

Question

i am having a problem deleting child object
here is my code
my hibernate files are generated with xdoclet
I want to remove an object AFVALSTOF with all it's childs. the relationship is bi-directional. parent object is AFVALSTOF and as example child is OVERBRENGER. the relationship is obligated (not-null="true")
By viewing the hibernate logging i can see that the key field of the child is update to null first but this is an obligated field.
Can anyone help me on how to define my relationship so i can execute the cascade delete?
This is a part of my parent object (AFVALSTOF) which causes
problems
/     private Set overbrenger = new HashSet( );
     * @hibernate.set tablename="overbrenger" lazy="true" inverse="false"
     * cascade="all-delete-orphan"
     * @hibernate.collection-key column="ovbr_afvs_id"
     * @hibernate.collection-one-to-many class="be.milieuinfo.imjv.database.model.afval.Overbrenger"
     * @return Set
     public Set getOverbrenger() {
          return overbrenger;
     * @param overbrenger
     * Overbrenger
     public void setOverbrenger(Set overbrenger) {
          this.overbrenger = overbrenger;
THIS IS THE CHILD (OVERBRENGER) which has a relationship to the PARENT called AFVALSTOF
private Afvalstof afvalstof ;
* @hibernate.many-to-one column="ovbr_afvs_id" class=
     * "be.milieuinfo.imjv.database.model.afval.Afvalstof"
     * not-null="true" inverse="true" cascade="all"
* @return Afvalstof
public Afvalstof getAfvalstof() {
     return afvalstof ;
* @param afvalstof
public void setAfvalstof(Afvalstof afvalstof) {
     this.afvalstof = afvalstof ;
thnx
Stefaan

Answer 1

<?xml version="1.0"?>
  <!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="com.orly_otero.patterns.VO.ArticleVO" table="tblArticles">
    <id name="idArticle" type="long">
      <column name="id_Article" not-null="true"/>
      <generator class="native"/>
    </id>
    <property name="title" type="string">
      <column name="Title" length="200" not-null="true"/>
    </property>
    <property name="abstracT" type="string">
      <column name="Abstract" length="2000" not-null="true"/>
    </property>
    <property name="keywords" type="string">
      <column name="Keywords" length="200" not-null="true"/>
    </property>
    <property name="type" type="string">
      <column name="type" length="1" not-null="true"/>
    </property>
    <property name="position" type="integer">
      <column name="position" not-null="false"/>
    </property>
    <property  name="isBriefContribution" type="boolean">
      <column name="isBriefContribution" not-null="false"/>
    </property>
    <many-to-one name="issueVO" column="id_Issue" class="com.orly_otero.patterns.VO.IssueVO" not-null="true"/>
    <set name="authorsVO" table="tlbArticlesAuthors" lazy="true" cascade="save-update">
      <key column="id_Article"/>
      <many-to-many class="com.orly_otero.patterns.VO.AuthorVO" column="id_Author"/>
    </set>
    <set name="sectionsVO" inverse="true" lazy="true" cascade="all" order-by="position ASC">
      <key column="id_Article" not-null="true"/>
      <one-to-many class="com.orly_otero.patterns.VO.SectionVO"/>
    </set>
  </class>
</hibernate-mapping>