#1395 ✓resolved
Martin Gontovnikas

OrphanRemoval bug in OneToMany relations in Play!

Reported by Martin Gontovnikas | January 27th, 2012 @ 03:41 AM | in 1.2.5 (closed)

I have a relation of OneToMany that I don't want it to be
bidirectional.

The relation is:

@MinSize(1)

@Required 
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY,

orphanRemoval= true)

@JoinTable( name = "ProductItemForProduct", 
            joinColumns = @JoinColumn(name = "productId"), 
            inverseJoinColumns = @JoinColumn(name =

"productItemId"),

            uniqueConstraints = @UniqueConstraint(name =

"uq_productItemPerProduct", columnNames = {

                    "productId", "productItemId"})) 
public Set<ProductItem> items = Sets.newHashSet();

The problem is that I'm getting an error each time that I edit the
element:
"org.hibernate.HibernateException: A collection with cascade="all- delete-orphan" was no longer referenced by the owning entity instance"

So I started to debug code, and the problem is that Play JPA plugin
when does the binding of a OneToMany relation, it creates a new
HashSet and then it fills it with the elements ans assign it to the
parent object. That's precisely the problem.
If we use orphanRemoval, Hibernate needs the Collection NOT to be set
again, and to be modified the one that exists. You can either clear it
and add all of the elements again. If I don't set the orphanRemoval,
the ProductItem table increases exponentially.

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