[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-7213) Hibernate throws a "MappingException: Repeated column in mapping for collection" on order columns also being a foreign key/relationship column

Hibernate throws a "MappingException: Repeated column in mapping for collection" on order columns also being a foreign key/relationship column ---------------------------------------------------------------------------------------------------------------------------------------------- Key: HHH-7213 URL: https://hibernate.onjira.com/browse/HHH-7213 Project: Hibernate ORM Issue Type: Bug Affects Versions: 4.1.1 Reporter: Karsten Wutzke I'm using an order column for an @OrderColumn which is also part of a foreign key like: {code}@ManyToMany @JoinTable(name = "GroupLinks", joinColumns = {@JoinColumn(name = "parent_round_id", referencedColumnName = "round_id"), @JoinColumn(name = "parent_ordinal_nbr", referencedColumnName = "ordinal_nbr")}, inverseJoinColumns = {@JoinColumn(name = "child_round_id", referencedColumnName = "round_id"), @JoinColumn(name = "child_ordinal_nbr", referencedColumnName = "ordinal_nbr")}) @OrderColumn(name = "child_ordinal_nbr") private List<Group> children;{code} As you can see the order column "child_ordinal_nbr" is also an FK (and PK) in the join table. However, this fails with a mapping exception: {code}Caused by: org.hibernate.MappingException: Repeated column in mapping for collection: com.kawoolutions.bbstats.model.Group.parents column: parent_ordinal_nbr at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:340) at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:363) at org.hibernate.mapping.Collection.validate(Collection.java:320) at org.hibernate.mapping.IndexedCollection.validate(IndexedCollection.java:89) at org.hibernate.cfg.Configuration.validate(Configuration.java:1291) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1729) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:84) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904) ... 9 more{code} IMO there's no reason to assume the order column is not a foreign key column, too. I've posted an extensive example over at stackoverflow.com: http://stackoverflow.com/questions/9957247/is-manytomanymappedby-ordercol... While the JPA spec is silent about this behavior there's no reason why the depicted scenario shouldn't be working.