Hibernate version: 2.1.8

Mapping documents: classic parent/child bidirectional one to many inverse = true, Area(1) -> (*)Zone

I'm using Spring + hibernateTemplate

So what I do is I want to update a Zone. The zone is disconnected between requests, being stored in a session form bean. When I update the zone, I must specify the area it is in:

Area.addZone() method body:
getZones().add(zone)
zone.setArea(this);

At update form submission I do this:

Area area = getHibernateTemplate().get(Area.class, areaId);
area.addZone(zone);
getHibernateTemplate().update(zone);

Here I get: "a different object with the same identifier value was already associated with the session ... of class: Zone

Can somebody give me a hint how to do to avoid it. Thanks.

instead of update try doing a merge.

sorry didn't see you were using spring. with hibernate 2.1.8

hibernate 3 has merge which solves this problem.