I have two tables (see below).

FOO
----------------------------
FOO_ID(PK)
BAR_ID(FK)

BAR
----------------------------
BAR_ID(PK)
Name

I want to map these both to a single Foo entity using a Secondary Table.

@Entity
@Table(name="FOO")
@SecondaryTable(name="Bar", pkJoinColumns(@PrimaryKeyJoinColumn(name="BAR_ID", referencesColumnName="BAR_ID"))
public class Foo
{}

This didn't work, the below exception was thrown. Is there any way to map this?

Exception in thread "EntityManagerFactory Initializer" javax.persistence.PersistenceException: org.hibernate.AnnotationException: SecondaryTable JoinColumn cannot reference a non primary key
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:252)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:120)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at com.surveysampling.emailpanel.ordereditor.resource.ResourceManager.initializeEntityManagerFactory(ResourceManager.java:302)
at com.surveysampling.emailpanel.ordereditor.resource.ResourceManager.access$0(ResourceManager.java:295)
at com.surveysampling.emailpanel.ordereditor.resource.ResourceManager$1.run(ResourceManager.java:87)
Caused by: org.hibernate.AnnotationException: SecondaryTable JoinColumn cannot reference a non primary key
at org.hibernate.cfg.annotations.TableBinder.bindFk(TableBinder.java:225)
at org.hibernate.cfg.annotations.EntityBinder.bindJoinToPersistentClass(EntityBinder.java:439)
at org.hibernate.cfg.annotations.EntityBinder.createPrimaryColumnsToSecondaryTable(EntityBinder.java:427)
at org.hibernate.cfg.annotations.EntityBinder.finalSecondaryTableBinding(EntityBinder.java:360)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:741)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:452)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:268)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1115)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1233)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:154)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:869)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:183)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:240)
... 5 more

no relation with inverse, which is supported in SVN, but a join on a non pk is not supported by annotations. If you want to contribute, let me know.