@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) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira