Hibernate version: 3.1
Hibernate Annotations version: 3.1beta7
Database: PostgreSQL 8.1.2

In a read-only transaction I have just one Named Query with a fetch join. After invoking commit() the version number of the retrieved objects is incremented (not of the additionally fetched objects).

Is this result correct?

Is rollback() the only solution to prevent a read-only transaction from incrementing version numbers?

not enough info

The read-only transaction basically looks as follows, but increments the version number for optimistic synchronization:

Session s = HibernateUtil.getSession();
Transaction t = s.beginTransaction();
String lastname = "...";
Query q = s.getNamedQuery(CUST_BY_LASTNAME_FETCH_ORDERS);
q.setString("lastname", lastname);
q.setCacheable(true);
q.setCacheRegion("org.hibernate.cache.StandardQueryCache");
Collection<CustomerData> customers = query.list();
t.commit();

The POJO with the named query looks as follows:

@Entity(access=FIELD)
@Table(name="customer", schema="hska")
@Inheritance()
@DiscriminatorColumn(name="kind", length=1)
@NamedQueries({
CustomerData.CUST_BY_LASTNAME_FETCH_ORDERS,
queryString = "FROM CustomerData c LEFT JOIN FETCH c.orders WHERE c.lastname = :lastname")
})
@Cache(usage=READ_WRITE, region="CustomerCache")
public abstract class KundeData implements java.io.Serializable {
@Id(generate=AUTO, generator="customer_sequence_name")
@SequenceGenerator(name="customer_sequence_name",
sequenceName="customer_sequence")
protected long id = 0;

@Version
protected int version = 0;
...
}