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

[Emmanuel Bernard (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-261?page=all ]
     
Emmanuel Bernard resolved EJB-261:
----------------------------------

    Resolution: Fixed

> 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. 

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