Criteria API + Hibernate 4.2.4 final - fetching @OneToOne properties does not work bidirectional

Question

Here are parts of two related entities

Entity Trademark

public class Trademark extends AbstractEntity {
    @OneToOne(mappedBy = "trademark", optional = false, cascade = CascadeType.MERGE)
    private ReferenceNumber referenceNumber;
(...)

}

Entity ReferenceNumber

public class ReferenceNumber extends AbstractEntity {

    @OneToOne(optional = true)
    private Trademark trademark;
(...)
}

And now, lets fetch somethig via Criteria Api:

protected Criteria createCriteria(SharedSessionContract session) {
    Criteria criteria = session.createCriteria(Trademark.class);
    criteria.createAlias("service", "s");
    criteria.createAlias("referenceNumber", "rn", JoinType.INNER_JOIN);
    criteria.add(Restrictions.eq("deleted", false));
    criteria.add(Restrictions.in("service", createServiceList(getConfig().getServices())));
    criteria.setMaxResults(1);
    return criteria;

property referenceNumber is not fetched - null on every entity. However this one:

    protected Criteria createCriteria(SharedSessionContract session) {
        Criteria criteria = session.createCriteria(ReferenceNumber.class);
        criteria.createAlias("service", "s");
        criteria.createAlias("trademark", "t", JoinType.INNER_JOIN);
        criteria.add(Restrictions.eq("t.deleted", false));
        criteria.add(Restrictions.in("t.service", createServiceList(getConfig().getServices())));
        criteria.setMaxResults(1);
        return criteria;
}

works just fine. It returns exact number of results (yes, I am counting them before fetching) but here relations are fetched just fine. How come? How to make H to fetch properties like in second example.

Edit:

"Real" sql generated by H is actually joining by criteria, so entity mapper is not doing his job here I guess: inner join referencenumber rn2_ on this_.id=rn2_.trademark_id -> referenceNumber.id=trademark.id whitch is fine. Hibernate bug?

Answer 1

I remember reading that a bug was recently fixed regarding OneToOne mappings; you may want to try upgrading to the latest patch version (4.2.7 SP1 at the time of writing) to see if that changes anything.

Answer 2

Add this point I'd investigate using log4jdbc to see what SQL query is generated by Hibernate; I'm betting there is a difference there, like a join being done wrong. I've triggered Hibernate to produce the wrong results by setting a wrong nullability property for example.