What ever i try, i can't get it to work...please help.

<hibernate-mapping>
<class name="StamTabel" table="STAMTABEL">
<id name="id" column="ST_ID" type="long" >
<generator class="sequence"/>
</id>

<list name="stamDataDictionaries" inverse="true" cascade="all">
<key column="ST_ID" />
<index column="SD_VOLGNUMMER" />
<one-to-many class="StamDataDictionary" />
</list>

<property name="naam" column="ST_NAAM" not-null="true" unique="true" />
<property name="omschrijving" column="ST_OMSCHRIJVING" not-null="true" unique="true" />
<property name="datumUpload" column="ST_DATUMTIJD_UPLOAD" not-null="true" unique="true" type="timestamp" />

</hibernate-mapping>

<hibernate-mapping>
<class name="StamDataDictionary" table="STAMDATADICTIONARY">
<composite-id >
<key-property name="stamTabelId" column="ST_ID" type="big_integer" />
<key-property name="volgnummer" column="SD_VOLGNUMMER" type="integer"/>
</composite-id>

<many-to-one name="stamtabel" class="StamTabel" column="ST_ID" not-null="true" update="false" insert="false" cascade="all"/>

<property name="naam" column="SD_NAAM" not-null="true" />
<property name="datatype" column="SD_DATATYPE" not-null="true" />
<property name="lengte" column="SD_LENGTE" not-null="true" />

</class>

</hibernate-mapping>

Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();

StamTabel stamtabel = new StamTabel();
stamtabel.setNaam("Naam");
stamtabel.setDatumUpload(new Date());
stamtabel.setOmschrijving("Een omschrijving");

StamDataDictionary stamdd = new StamDataDictionary();
stamdd.setVolgnummer(Integer.valueOf(1));
stamdd.setNaam("Kolom naam");
stamdd.setDatatype("String");
stamdd.setLengte(Integer.valueOf(15));

stamtabel.addStamDataDictionary(stamdd);

Long msgId = (Long) session.save(stamtabel);

tx.commit();
session.close();

DEBUG - SQL -
insert
into
STAMDATADICTIONARY
(SD_NAAM, SD_DATATYPE, SD_LENGTE, ST_ID, SD_VOLGNUMMER)
values
(?, ?, ?, ?, ?)
Hibernate:
insert
into
STAMDATADICTIONARY
(SD_NAAM, SD_DATATYPE, SD_LENGTE, ST_ID, SD_VOLGNUMMER)
values
(?, ?, ?, ?, ?)
DEBUG - AbstractBatcher - preparing statement
DEBUG - AbstractEntityPersister - Dehydrating entity: [StamDataDictionary#component[stamTabelId,volgnummer]{stamTabelId=null, volgnummer=1}]
DEBUG - AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
DEBUG - AbstractBatcher - closing statement
DEBUG - JDBCExceptionReporter - could not insert: [StamDataDictionary] [insert into STAMDATADICTIONARY (SD_NAAM, SD_DATATYPE, SD_LENGTE, ST_ID, SD_VOLGNUMMER) values (?, ?, ?, ?, ?)]
java.sql.SQLException: Attempt to insert null into a non-nullable column: column: ST_ID table: STAMDATADICTIONARY in statement [insert into STAMDATADICTIONARY (SD_NAAM, SD_DATATYPE, SD_LENGTE, ST_ID, SD_VOLGNUMMER) values (?, ?, ?, ?, ?)]


I tried every example from book, tutorials etc...but in any examples there has the child table a primarykey of 2 colums. ST_ID is the Foreignkey form STAMTABEL and ST_VOLGNUMMER is a generated value by the application.

Please can somebody help me??

Regards,

Jeroen