[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-681) @OneToOne Object references can't be used as @Id

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28918 ] 

Emmanuel Bernard commented on ANN-681:
--------------------------------------

Not the NPE is fixed, the feature has not been added through
http://forum.hibernate.org/viewtopic.php?t=970823


> @OneToOne Object references can't be used as @Id
> ------------------------------------------------
>
>                 Key: ANN-681
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-681
>             Project: Hibernate Annotations
>          Issue Type: Bug
>          Components: binder
>    Affects Versions: 3.3.0.ga
>            Reporter: __dk__
>
> Is this related to ANN-619, or is it in general impossible to use object refs as IDs? Don't know:
> Dummy:
> class B {
>   @Id
>   [... Generator ...]
>   long id;
> }
> This works:
> class A {
>   @Id
>   long id;
> 	
>   @OneToOne(optional=false, fetch=FetchType.LAZY)
>   @JoinColumn(name="B_ID", nullable=false, updatable=false)
>   B b;
> }
> This doesn't:
> class A {
>   @Id
>   @OneToOne(optional=false, fetch=FetchType.LAZY)
>   @JoinColumn(name="B_ID", nullable=false, updatable=false)
>   B b;
> }
> Output:
> 05:59:11 FATAL [artcollector.welt.Persistence] Exception: 
> org.hibernate.MappingException: Could not determine type for: test.B, for columns: [org.hibernate.mapping.Column(b_id)]
> 	at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:266)
> 	at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:253)
> 	at org.hibernate.mapping.RootClass.validate(RootClass.java:193)
> 	at org.hibernate.cfg.Configuration.validate(Configuration.java:1102)
> 	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)
> 	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
> 	at test.Persistence.init(Persistence.java:33)

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