A combination of Criteria, fetch="join", and possibly "many-to-many" mapping creates wrong number of objects.
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Key: HHH-1960
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1960
Project: Hibernate3
Type: Bug
Components: query-criteria
Versions: 3.1.3
Environment: Version 3.1.3, all databases.
Reporter: Michael Reviakin
Add following method to the EventManager class from the tutorial:
List findPerson(String lastName) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List result =
session.createCriteria(Person.class).
add(Restrictions.eq("lastName", lastName)).
list();
session.getTransaction().commit();
return result;
}
Create at least one Person and two Events, add Person to both Events.
call System.out.println(eventManager.findPerson(person.getLastName()).size());
The output should be 1.
Change Person.hbm.xml file, add fetch="join" attribute to the events mapping as following:
<set name="events" table="PERSON_EVENT" fetch="join">
<key column="PERSON_ID"/>
<many-to-many column="EVENT_ID" class="events.Event"/>
</set>
Run the same test, the output will be 2.
Change "functional" part of the findPerson method to:
List result =
session.createQuery("from Person where lastName = :lastName").
setString("lastName", lastName).
list();
Run the same test, the output will be 1 again.
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