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https://issues.apache.org/jira/browse/OPENJPA-2181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263688#comment-13263688
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Rick Curtis commented on OPENJPA-2181:
--------------------------------------
Attaching more details from the users mailing list....
There are two workarounds:
Option #1 -- you could change your ID generation strategy to AUTO[1].
Option #2 -- don't rely on the cascade persist functionality. Manually persist
each of your children objects (Class1, Class2) before persisting Holder[2].
[1]
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
[2]
class HolderDao ....
public boolean create(Holder h) {
EntityTransaction trans = em.getTransaction();
trans.begin();
for (IInterface i : h.getClasses()) {
em.persist(i);
}
em.persist(h);
trans.commit();
return true;
> Cascading a persist to a collection of Entities that use IDENTITY generation
> strategy fails.
> --------------------------------------------------------------------------------------------
>
> Key: OPENJPA-2181
> URL: https://issues.apache.org/jira/browse/OPENJPA-2181
> Project: OpenJPA
> Issue Type: Bug
> Affects Versions: 2.1.1, 2.2.0
> Reporter: Andrei Bratu
> Labels: IDENTITY, OneToMany, cascade, persist, strategy
> Attachments: src.rar
>
>
> I have an Interface (IInterface) and 2 classes that implements that interface
> (IInterface). Also in another class ( Holder ) I have a collection of
> interface items ( Collection<IInterface> ).
> When I try to execute the code from OpenJPA_Test.main, in my associated table
> ( holder_classes), the column which is supposed to hold the references to
> Class1 or Class2 objects are NULL.
> public class OpenJPA_Test {
> private static HolderDao holderDao =
> EntityDaoFactory.inst().getHolderDao();
>
> /**
> * @param args the command line arguments
> */
> public static void main(String[] args) {
> // TODO code application logic here
> Holder h = new Holder();
> LinkedList<IInterface> list = new LinkedList<IInterface>();
>
> Class1 c1 = new Class1();
> Class2 c2 = new Class2();
>
> list.add(c1);
> list.add(c2);
>
> h.setClasses(list);
> holderDao.create(h);
>
> }
> }
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