[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3332) Hibernate duplicate then child entity's on merge

[Vlad Mihalcea (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35179#action_35179 ] 

Vlad Mihalcea commented on HHH-3332:
------------------------------------

Hi,

This is my use case:

public class Round {
...
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "route")
    @Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE,
      org.hibernate.annotations.CascadeType.MERGE,
      org.hibernate.annotations.CascadeType.REMOVE
     })
    @org.hibernate.annotations.Fetch(value = org.hibernate.annotations.FetchMode.SUBSELECT)
    public List<SubRound> getSubRoutes() {
		return subRounds;
    }

    @Transient
    public void addSubRoute(SubRound sr) {
        if (sr != null) {
            sr.setRoute(this);
            getSubRoutes().add(sr);
        }
    }
...
}

public class SubRound {
...
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "route_id")
    public Round getRoute() {
		return route;
    }
...
}

Round r1 = new Round();
r1 = getHibernateTemplate().merge(r1);
SubRound sr1 = new SubRound();
r1.addSubRoute(sr1);
getHibernateTemplate().merge(sr1);

There will be two SubRound(s) rows in the database.

Vlad

> Hibernate duplicate then child entity's on merge
> ------------------------------------------------
>
>                 Key: HHH-3332
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3332
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.2.6
>         Environment: JDK 1.6
> Oracle 9i
> Hibernate 3.2.6
> Hibernate Annotations 3.3.1
> Hibernate EntityManager 3.3.2
> Standalone Running
>            Reporter: Rodrigo de Assumpção
>            Priority: Critical
>         Attachments: ExampleBug.zip
>
>
> The method merge from EntityManager causes a duplication of child entity's.
> class Father:
>     @OneToMany(mappedBy = "father", cascade={CascadeType.ALL}, fetch=FetchType.LAZY) 
>     private List<Child> childList;
> class Child:
>     @ManyToOne  @JoinColumn(name = "ID_FATHER")
>     private Father father;
> class BugTest
>         EntityManagerFactory emf = Persistence.createEntityManagerFactory("JpaTestHB");
>         EntityManager em = emf.createEntityManager();
>         
>         Father f = (Father) em.createQuery("SELECT f FROM Father f  WHERE f.id = 1").getSingleResult();
>         
>         Child c = new Child();
>         c.setFather(f);
>         f.getChildList().add(c);
>         
>         em.getTransaction().begin();
>         em.merge(f);
>         em.getTransaction().commit();
> The execution of BugTest Class causes tow insert's on table "child".
> If you change the fetch mode to EAGER (into Father class) the problem not occurs.
> I make the same test with Toplink, and it make a unique insert, normal.

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