Repeated columns created for single table inheritance ----------------------------------------------------- Key: ANN-688 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-688 Project: Hibernate Annotations Issue Type: Bug Affects Versions: 3.3.0.ga Environment: Hibernate 3.2.5ga, Postgresql Reporter: Nick Heudecker I have the following classes: @Entity @Inheritance(strategy= InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name="cltype", discriminatorType= DiscriminatorType.STRING, length=10) @DiscriminatorValue("device") public abstract class Device extends AbstractPersistent { private System system; @ManyToOne public System getSystem() { return system; } public void setSystem(System system) { this.system = system; } } @Entity @DiscriminatorValue("snmp") public class SnmpDevice extends Device { // .... additional properties defined } When I try to create the SessionFactory, I'm getting the following exception: Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: model.SnmpDevice column: system_uuid (should be mapped with insert="false" update="false") at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:652) at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:674) at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:696) at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:450) at org.hibernate.mapping.SingleTableSubclass.validate(SingleTableSubclass.java:43) at org.hibernate.cfg.Configuration.validate(Configuration.java:1102) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287) -- 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