[hibernate-issues] [Hibernate-JIRA] Created: (HHH-7138) Hibernate implements JPA @OneToMany collection versioning incorrectly

[Uli Bubenheimer (JIRA)]

Hibernate implements JPA @OneToMany collection versioning incorrectly
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                 Key: HHH-7138
                 URL: https://hibernate.onjira.com/browse/HHH-7138
             Project: Hibernate ORM
          Issue Type: Bug
    Affects Versions: 4.1.0, 3.6.8
         Environment: Hibernate 4.1.0 or 3.6.8., SQL Server or H2 Database Engine
            Reporter: Uli Bubenheimer
         Attachments: H812NVersioningBug.zip

Context: In my pure JPA-compliant app I have a bidirectional 1:n relationship expressed via a @ManyToOne foreign key on the child entity class, and a @OneToMany collection of children on the parent entity class. Both entity classes use optimistic locking via a @Version field.

Problem: When I create a new child entity, and add the entity to the collection on the parent, the parent's version changes, causing OptimisticLockingException when concurrently creating child entities. As the parent is the non-owning side of the relationship, this violates the JPA spec.

JPA 2.0 states the following (Section 3.4.2):
bq.The version attribute is updated by the persistence provider runtime when the object is written to the database. *All non-relationship fields and properties and all relationships owned by the entity are included in version checks.*

What the JPA spec says is reasonable, as the parent entity's associated DB record does not change at all in this case (besides the bad version increment).

I am attaching a simple test case reproducing the problem.

This was previously described here: http://stackoverflow.com/a/5259163
It looks like no defect was created at the time.

A workaround, as mentioned in the article, is to specify @OptimisticLock(exclude = true) on the @OneToMany collection field. However, this pollutes a pure JPA app and makes it non-portable.

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