[hibernate-issues] [Hibernate-JIRA] Resolved: (EJB-261) merge fails to update join table

merge fails to update join table -------------------------------- Key: EJB-261 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-261 Project: Hibernate Entity Manager Type: Bug

Components: EntityManager Versions: 3.2.1 Environment: Embedded entity manager 3.2.1 with DB2 or MySQL Reporter: Bryan Hunt Assignee: Emmanuel Bernard Priority: Minor Fix For: 3.3.0.ga Attachments: hibernate.bug.zip Doing a merge on an entity with a one to many relationship does not update the join table. I have the following entities: @Entity public class Foo { ... @OneToMany(cascade = CascadeType.ALL) private Set<Bar> bars; } @Entity public class Bar { ... } The following works: Foo foo = new Foo(); Bar bar = new Bar(); foo.getBars().add(bar); em.getTransaction().begin(); em.persist(foo); // <<----------------- correctly updates the join table em.getTransaction().commit(); This also works: Foo foo = em.find(Foo.class, id); Bar bar = new Bar(); foo.getBars().add(bar); em.getTransaction().begin(); em.persist(bar); em.merge(foo); // <<----------------- correctly updates the join table em.getTransaction().commit(); When this code executes the new Foo and Bar are persisted to the database, an entry is made into the join table, and all is well. The following fails: Foo foo = em.find(Foo.class, id); Bar bar = new Bar(); foo.getBars().add(bar); em.getTransaction().begin(); em.merge(foo); // <<----------------- does not update the join table em.getTransaction().commit(); When this code executes, the new Bar is persisted to the database, but the join table is not updated.