[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-591) SchemaExport throws ConcurrentModificationException for entity containing list of lists

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_26857 ] 

Emmanuel Bernard commented on ANN-591:
--------------------------------------

"it does work most of the time" forget about that, I was thinling about collection of entities.
Collection of elements containing collections of entities is probably hard to solve in annotations because of the way the default values are to be processed.

> SchemaExport throws ConcurrentModificationException for entity containing list of lists
> ---------------------------------------------------------------------------------------
>
>                 Key: ANN-591
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-591
>             Project: Hibernate Annotations
>          Issue Type: Bug
>          Components: binder
>    Affects Versions: 3.2.1
>         Environment: Hibernate 3.2.1.GA, Oracle 10
>            Reporter: Ivan O'Connor
>         Attachments: hbm2ddl.zip
>
>
> I have a class, let's call it A, that contains a List of class B. Each instance of B has a List of class C. I'm trying to generate the DDL for this, so I've annotated the code and run it through SchemaExport, which throws a ConcurrentModificationException. My environment: Java 1.5, Oracle 10, Hibernate 3.2.1ga.
> The problem seems to be caused by having an entity (A) containing an embedded collection (of B), each element of which contains a collection (of C). SchemaExport generates correct DDL when the annotations are modified to make B and/or C an entity, but not when they are both components. I realise this is considered something of an exotic case, but I'd like to know why the DDL doesn't generate.
> See bugReport.txt in attached zip for further details.

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