[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5046) Cannot nest collections of Embeddable and basic type on an entity
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http://opensource.atlassian.com/projects/hibernate/browse/HHH-5046?page=c...
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Christophe LANNOY commented on HHH-5046:
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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
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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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