Raible Designs

Hibernate Help Needed

I'll try the approach that Lance used to solve my Hibernate problem. First, I'll explain the problem. In two days, if I haven't solved it - I'll bash on Hibernate and say it s***s (can't do it yet - right ;-), and then I'll claim it rocks once I get my problem solved. Hmmm, it took Lance 4 days - I have 3 before my deadline (Thursday). Luckily, I know of workarounds already (I just want to do things the recommended way) - therefore, I should never have to bash on Hibernate.

My problem is basically that I have a Parent object and it has a one-to-many relationship to a Child object. This is usually a very simple thing to configure in a Parent.hbm.xml file. To make things complicated, my Child object has a composite-id which is another class. I can retrieve information just fine, but when I try to save the Parent, Hibernate tries to insert a new Child. Here's the message I sent to the hibernate-devel mailing list:

** all classes extend from BaseObject with has equals(), 
   hashCode() and toString() methods.

Parent.java
---
private Long id;
private List children;
+appropriate getters/setters

Parent.hbm.xml
---
<bag role="children" table="CHILDREN" cascade="all">
    <key column="parent_id" length="22"/>
    <one-to-many class="eg.Child"/>
</bag>

Child.java
---
private ChildId id;
+appropriate getter/setter

ChildId.java
---
private Long parentId;
private Long recordNum;
+ appropriate getter/setters

Child.hbm.xml
---
<composite-id name="id"
    class="eg.ChildId"
    unsaved-value="none">
    <key-property column="parent_id" length="22" 
        name="parentId" type="long"/>
    <key-property column="record_num" length="22" 
        name="recordNum" type="long"/>
</composite-id>

I am able to retrieve children just fine, but when I try to save 
the parent, hibernate tries to do an insert and I get a unique 
constraint violation.

I'm calling the following method to save everything:

public Parent saveParent(Parent p) throws DAOException {
    storeObject(p);
    return (Parent) retrieveObject(eg.Parent.class, p.getId());
}

I got the storeObject method from one of the examples floating 
around, so it could definitely be my problem:

protected void storeObject(Object obj) throws DAOException {
    Session ses = null;

    try {
        ses = HibernateSession.currentSession();
        ses.saveOrUpdate(obj);
        ses.flush();
        ses.connection().commit();
    } catch (Exception e) {
        try {
            ses.connection().rollback();
        } catch (Exception ex) {
            e.printStackTrace();
        }

        ;
        throw new DAOException(e);
    } finally {
        try {
            HibernateSession.closeSession();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        ;
    }
}

As always, any help is greatly appreciated.