NHibernate: uninitialized proxy passed to save() and cascade

Question

Hi,

I keep getting an NHibernate.PersistentObjectException when calling session.Save() which is due to an uninitialized proxy passed to save(). If I fiddle with my cascade settings I can make it go away, but then child objects aren't being saved.

The only other fix I have found is by adding the following to my DefaultSaveEventListener.

    protected override bool ReassociateIfUninitializedProxy(object obj, global::NHibernate.Engine.ISessionImplementor source)
    {
        if (!NHibernateUtil.IsInitialized(obj))
            NHibernateUtil.Initialize(obj);

        return base.ReassociateIfUninitializedProxy(obj, source);
    }

This is obviously not an ideal solution.

Any ideas?

Answer 1

When you create the base object does that object in turn either create or null the cascading objects?

Answer 2

In my event listener I'm calling lifecycle events on the object which populates the children.

Answer 3

Are you loading the objects in different sessions?

Answer 4

No, all from the same session, which is why it's so confusing.

Answer 5

You probably break something in you event listeners. What is the complete error message you get?

Answer 6

Are you trying to work with a child object that is in a list on a root aggregate entity? If you are, you need to work with the root, traverse to the child, make the changes, and save the root, not the child.

Answer 7

This happened to me too.

The fix was simple : use ISession.Get() and not ISession.Load()

Answer 8

There mere presence of a custom DefaultSaveEventListener subclass containing no overidden or extended behaviour is enough to trigger this exception for me, using the following configuration Xml:

<event type="save-update">
    <listener class="MyNamespace.MyCustomSaveEventListener, MyAssembly" />
</event>

I am continuing this discussion in this question.