[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5046) Cannot nest collections of Embeddable and basic type on an entity

[Christophe LANNOY (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36019#action_36019 ] 

Christophe LANNOY commented on HHH-5046:
----------------------------------------

Mea culpa, I'm sorry, I was wrong :
I didn't understand why you changed this "issue Type" from "Bug" to "New Feature", I read again JSR-317 :
chapter 2.5 says : 
"An embeddable class (including an embeddable class within another embeddable class) may contain a collection of a basic type or other embeddable class.[16]"
but chapter 2.6 says (what I didn't see) : 
"An embeddable class (including an embeddable class within another embeddable class) that is contained within an element collection must not contain an element collection, nor may it contain a relationship to an entity other than a many-to-one or one-to-one relationship."

JSR-317 do not allow what I wan't to do.

Yes, such a feature would be usefull in hibernate (I tried with Hibernate annotation too) and in the next jpa spec. Actually, in entity-manager implementation, a good feature would be a more clear error message that said it is not possible to do nesting (java.util.ConcurrentModificationException on start is not very helpfull).

We have found a workaround : making, in my example, EmbElement as Entity and cascading all / orphanRemoval=true on embElements collection, in spite of in our application the class is more an embeddable than an Entity.



> Cannot nest collections of Embeddable and basic type on an entity
> -----------------------------------------------------------------
>
>                 Key: HHH-5046
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5046
>             Project: Hibernate Core
>          Issue Type: New Feature
>          Components: entity-manager
>    Affects Versions: 3.5.0-CR-2
>         Environment: Hibernate-entity-manager 3.5.0-CR-2, database H2
>            Reporter: Christophe LANNOY
>         Attachments: stacktrace, testEmbColl.zip
>
>
> We cannot nest a String collection on an embeddable element which is inside a collection or a map on an Entity : Entity manager do not start :
> Persistence.createEntityManagerFactory("manager1"); give us :
> Persistence.createEntityManagerFactory("manager1", configOverrides);
> ...
> Caused by: java.util.ConcurrentModificationException    -> see stacktrace file attached
> Mapping is :
> @javax.persistence.Entity
> public class Entity implements Serializable {
> ...
> 	@ElementCollection
> 	private Map<String, EmbElement> embElements =new HashMap<String, EmbElement>();
> ... }
> @Embeddable
> public class EmbElement implements Serializable {
> ...
> 	@ElementCollection
> 	private Set<String> sstring = new HashSet<String>();
> ...}
> The Zip attached contains the junit class test : EmbededMapTest wich reproduce this error.

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