Thanks for reading everyone.

Hibernate version: 3.0.3

Full stack trace of any exception that occurs:
org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session: [com.objects.Department#1]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.objects.Department#1]

Name and version of the database you are using: Oracle 9.2.0.4

I'm using Spring 1.2 RC2 with Hibernate 3.0.3. Does the above exception typically denote a flaw in the data itself or something to do with my relationships? I'm trying to save a Group object that contains Persons and other Groups as members. Each Person member has a Department that is cascaded, but not presented to the user when saving a Group. Should anything obvious jump out at me with this error?

Many thanks everyone,
Dustin

Just a quick guess, but are you implementing equals()/hashCode() in the collection childs by any chance?

As a matter of fact I am, for most of the objects anyway. Some of the field members don't have an equals()/hashCode() method. The equals() method compares the ID usually, but sometimes it's the names that get compared. Do you think that's the problem?

Thanks for the reply,
Dustin

Yes, it most probably is.

http://www.hibernate.org/109.html

Excellent, thank you very much.

Dustin