FK problem when inserting one-to-many records

Question

Hi everybody,
I see that this subject has been discussed here from time to time before, as in:
insert record with 1-M mapping missing foreign key using UOW
Sequences and multiple tables for inheritance
I followed Dougs advice on several posts, to check out the employee exampled shipped with Toplink, but regardless of all this information, I'm still stuck.
So, my issue: when I create new objects, add them to some other objects collection, and then call "assign sequence numbers" on all of them, the sequencenumbers are assgned all the way down the hierachy, but the upward links - the foreign keys - are not updated with the ID's of the parent object.
Simple example (might not compile - demo code):
<JAVA>
myInputController.session = (DatabaseSession)
SessionManager.getManager().getSession("some_session");
UnitOfWork myUnitOfWork = myInputController.session.acquireUnitOfWork();
// Father and Child are a Toplink objects, persisted to each their table with a
// FK relation, is now assigned to the UOW
Father myDBFather = (Father) myUnitOfWork.registerObject(new Father());
Child myDBChild = new Child();
myDBFather.getChildCollection().add(myDBChild);
// Now I could use the accessor methods of the Toplink objects to set
// stuff like name, phone number or so, but that's not important for demo.
// I just want to save my objects to the database. To do so, I need to
// assign sequence numbers:
myUnitOfWork.assignSequenceNumbers();
// I check the ID's before writing to DB:
System.out.println(myDBFather.GetId().toString());
System.out.println(myDBChild.GetId().toString());
// They both return valid numbers, similar to what the sequence objects
// of the database should asssign, so that works.
// But:
System.out.println(myDBChild.GetFaterid().toString());
// Will return null, even if myDBChild is a child of myDBFather, and
// hence a commit to the database will fail (no foreign key!).
// I can fix this, by "manually" setting the id:
myDBChild.SetFatherid(myDBFather.getId());
// And then a commit to the database will work:
myUnitOfWork.commit();
// But, since I have deep hierachies, and don't allways know what
// objects have been added/changed, it's a pretty wild thing, not
// to menition un-ellegant and heavy in maintenance, to loop down
// through the entire collection and update all foreign key ID's
// (FatherID's) before committing changes.
</JAVA>
I guess I'm just not hitting the right button somewhere? To create the Toplink Java classes and descriptors, I used "Java objects from tables" in JDev 10.1.2, both "as is", and with some tinkering on indirection, transparency and bi-directional relationships. Also, I get same results in the Toplink 10.1.3 dp4.
I must have missed the answer somewhere out there, but must post after trying really hard!
Best regards to all of you,
:) Ulf

Answer 1

I could kick myself right now!
The child setFatherid method takes an entire father object, so the code must be myDBChild.SetFatherid(myDBFather); instead of the myDBChild.SetFatherid(myDBFather.getId()); My apologies.
With the issue still very present, I post some code from the auto-generated child-class and the child-class descriptor below, which might give some pointers.
<JAVA-FRAGMENT>
package dk.test.fatherchild.model;
import oracle.toplink.indirection.ValueHolder;
import oracle.toplink.indirection.ValueHolderInterface;
public class Child {
* Map fatherid <-> dk.test.fatherchild.model.Father
* @associates <{dk.test.fatherchild.model.Father}>
     private ValueHolderInterface fatherid;
     private Double childid;
     private String childName;
public Child() {
     super();
     this.fatherid = new ValueHolder();
</JAVA-FRAGMENT>
<Child.ClassDescriptor.xml-FRAGMENT>
<mapping>
<inherited>false</inherited>
<instance-variable-name>fatherid</instance-variable-name>
<uses-method-accessing>false</uses-method-accessing>
<read-only>false</read-only>
<get-method-handle>
<method-handle empty-aggregate="true"/>
</get-method-handle>
<set-method-handle>
<method-handle empty-aggregate="true"/>
</set-method-handle>
<reference-descriptor>dk.test.fatherchild.model.Father.ClassDescriptor</reference-descriptor>
<private-owned>false</private-owned>
<uses-batch-reading>false</uses-batch-reading>
<maintains-bidirectional-relationship>true</maintains-bidirectional-relationship>
<relationship-partner-mapping-name>childCollection</relationship-partner-mapping-name>
<table-reference-mapping-reference-handle>
<reference-handle>
<reference-table>PERIODICA2.CHILD</reference-table>
<reference-name>CHILD_FATHER_FK</reference-name>
</reference-handle>
</table-reference-mapping-reference-handle>
<uses-joining>false</uses-joining>
<one-to-one-mapping-indirection-policy>
<indirection-policy>
<uses-indirection>true</uses-indirection>
</indirection-policy>
</one-to-one-mapping-indirection-policy>
<mapping-class>MWOneToOneMapping</mapping-class>
</mapping>
</Child.ClassDescriptor.xml-FRAGMENT>