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. -- 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