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

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 Assignee: Gail Badner Priority: Critical Attachments: ExampleBug.zip, Hibernate3332TestCase.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.