Hi,

I am using Hibernate3.0 (managed by Spring 1.2).

I created a persistent instance of a class by loading it from the session (the record corresponding to the Identity value exists in the DB Table).

Immediately following the load, i did "session.save(myObject)" and then "session.flush()".

Here is the sample code:
MyObject myObject = (MyObject)session.load(MyObject.class, myObjectId);
session.save(myObject);
session.flush();

This resulted in a "PersistentObjectException" with the message "Uninitialized proxy passed to save()".

I tried this purely out of curiosity, but I haven't been able to understand the outcome of this trial. Can anyone please describe this behaviour?

Regards,
Anil

You shouldn't use save method, you should use update method (or saveOrUpdate method)

1. Since class-level lazy loading is enabled for MyObject, Hibernate is giving you a proxy for the object with myObjectId (it's not even hitting the database).



Now you are passing an object that is already persistent to Session.save(), which doesn't make sense. You only need to save() it the first time. Then when you load() it Hibernate keeps tracks of what's changed and flushed it back to the database. The exception says "Uninitialized proxy" because of what I explained in (1).

To fix your code, just remove the call to session.save() and do myObject.setSomething(). You should probably read the section about Hibernate object lifecycle in the Hibernate in Action book.