[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5836) Mapping collection of entities with same name and notnull constraints from two different entities results in duplicate property mapping of Backref

[Milan Brich (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39595#action_39595 ] 

Milan Brich commented on HHH-5836:
----------------------------------

Problem looks like is in CollectionBinder class row 740:

String entityName = oneToMany.getReferencedEntityName();
PersistentClass referenced = mappings.getClass( entityName );
Backref prop = new Backref();
prop.setName( '_' + fkJoinColumns[0].getPropertyName() + "Backref" );

fkJoinColumns[0].getPropertyName() is same for both collections, maybe distingushing with fkJoinColumns[0].getLogicalColumnName() would resolve it.

> Mapping collection of entities with same name and notnull constraints from two different entities results in duplicate property mapping of Backref
> --------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5836
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5836
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: annotations
>    Affects Versions: 3.5.6
>            Reporter: Milan Brich
>         Attachments: hibernate-backref-bug.zip
>
>
> When two entities have OneToMany relationship to third entity and the collection name is same in both entities and nullable is set to false. Then exception written below is thrown.
> Caused by: org.hibernate.MappingException: Duplicate property mapping of _parentsBackref found in cz.csas.persistence.test.Parent
> 	at org.hibernate.mapping.PersistentClass.checkPropertyDuplication(PersistentClass.java:483)
> 	at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:473)
> 	at org.hibernate.mapping.RootClass.validate(RootClass.java:236)
> 	at org.hibernate.cfg.Configuration.validate(Configuration.java:1193)
> 	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1378)
> 	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
> 	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:892)
> 	... 58 more
> Attached annotated entities.

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