Version of all children is incremented in OneToMany when merging parent entity

[M. Walter]

I have a OneToMany relationship defined like this:

@Entity
Parent {
    @OneToMany(mappedBy = "parent", fetch = FetchType.LAZY, cascade = {
CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE})
    private List<Child> childList;
    // ...
    @Version
    private int version;
}

@Entity
Child {
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "PARENT_ID")
    private Parent parent;
    // ...
    @Version
    private int version;
}

Now when I change ONE of the child elements and do a merge by executing
em.merge(parent), the version of ALL children is incremented by one! I
expected that the version of the changed child is incremented only. Is this
a bug? I could not find anything about this behaviour in the
documentation...

--
View this message in context: 
http://openjpa.208410.n2.nabble.com/Version-of-all-children-is-incremented-in-OneToMany-when-merging-parent-entity-tp6645128p6645128.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.