I have a bi-directional relationship between A and C.

A has a one-to-many with C, and C has a many-to-one with A (*.hbm.xml below).

My issue is that the collection of C's is always updated upon saving A, even if the collection was never modified. For example:


// session is a Hibernate session

String hql = "select a from A a join fetch a.Cs where a.APK=1";

Query q = session.createQuery(hql);

List results = q.list();

A a = (A) results.get(0);

session.beginTransaction();

session.saveOrUpdate(a);

session.commitTransaction();

session.close();


In the above code, every C in the set of C's is updated, even though the collection was never modified in any way.

Thanks for your time and insights.

Gregg

A.hbm.xml
<hibernate-mapping>
<class name="A" table="A" >
<id name="APK" column="APK" type="long">
<generator class="edit.services.db.hibernate.KeyGenerator"/>
</id>
<set name="Cs" table="C" inverse="true" cascade="all" >
<key column="AFK"/>
<one-to-many class="C"/>
</set>
</hibernate-mapping>

C.hbm.xml
<hibernate-mapping>
<class name="C" table="C" >
<id name="CPK" column="CPK" type="long">
<generator class="edit.services.db.hibernate.KeyGenerator"/>
</id>
<many-to-one
name="A"
column="AFK
class="A"
cascade="none"
/>
</hibernate-mapping>

This usually mean that your equals/hashcode methods are incorrect

seb