Mapping bidirectional one-to-one relationship fails with an AnnotationException: Unknown mappedBy in: / referenced property unknown ----------------------------------------------------------------------------------------------------------------------------------- Key: HHH-6178 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6178 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.6.0 Environment: Hibernate 3.6.0 Final, HSQLDB 2.0.1 RC, JavaSE Reporter: Karsten Wutzke Priority: Critical Mapping a simple bidirectional one-to-one relationship fails with an AnnotationException for no obvious reason. DB design: CREATE TABLE Persons ( id INTEGER NOT NULL, first_name VARCHAR(50) NOT NULL, last_name VARCHAR(50) NOT NULL, PRIMARY KEY (id) ); CREATE TABLE Coaches ( id INTEGER NOT NULL, license_nbr VARCHAR(10) DEFAULT NULL NULL, PRIMARY KEY (id), FOREIGN KEY (id) REFERENCES Persons (id) ); CREATE TABLE Players ( id INTEGER NOT NULL, registration_nbr VARCHAR(20) DEFAULT NULL NULL, PRIMARY KEY (id), FOREIGN KEY (id) REFERENCES Persons (id) ); Mappings (relevant shown only): @Entity @Table(name = "Persons") public class Person implements Serializable { @Id @Column(name = "id") private Integer id; @Column(name = "first_name") private String firstName; @Column(name = "last_name") private String lastName; @OneToOne(mappedBy = "person") private Coach coach = null; @OneToOne(mappedBy = "person") private Player player = null; ... } @Entity @Table(name = "Players") public class Player implements Serializable { @Column(name = "registration_nbr") private String registrationNbr = null; @Id @OneToOne @JoinColumn(name = "id") private Person person = null; ... } @Entity @Table(name = "Coaches") public class Coach implements Serializable { @Column(name = "license_nbr") private String licenseNbr = null; @Id @OneToOne @JoinColumn(name = "id") private Person person = null; ... } The exception thrown in a test app: Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: persons] Unable to configure EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:374) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32) at tld.persons.Main.main(Main.java:34) Caused by: org.hibernate.AnnotationException: Unknown mappedBy in: tld.persons.model.Person.coach, referenced property unknown: tld.persons.model.Coach.person at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass.java:159) at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1686) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1393) at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1345) at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1477) at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:193) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1096) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:278) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:362) ... 4 more This exception is really surprising given the simplicity of this design. I've also tested this with EclipseLink which has no problems with the mappings. I'll attach an test case including the full code. -- 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