Repeated columns rejected in a collection of composite elements --------------------------------------------------------------- Key: HHH-572 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-572 Project: Hibernate Core Issue Type: Bug Affects Versions: 3.0.5 Environment: JRE 1.4.2_08 Reporter: Emmanuel Bourg Assignee: Gavin King Priority: Minor Repeating a column in a collection of composite elements triggers an error when the mapping is parsed, even if the property with the repeated column has the insert and update attributes set to false: <set name="children" table="CHILDREN"> <key column="PARENT_ID"/> <composite-element class="Child"> <property name="parentId" column="PARENT_ID" insert="false" update="false" /> </composite-element> </set> or <set name="roles" table="ROLE"> <key column="PARENT_ID"/> <composite-element class="Role"> <many-to-one name="child" class="Child"/> <property name="childId" column="CHILD_ID" insert="false" update="false" /> </composite-element> </set> Hibernate throws this exception: org.hibernate.MappingException: Repeated column in mapping for collection: Parent.children column: PARENT_ID at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:275) at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:298) at org.hibernate.mapping.Collection.validate(Collection.java:255) at org.hibernate.mapping.Set.validate(Set.java:19) at org.hibernate.cfg.Configuration.validate(Configuration.java:817) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:976) a workaround is to use a formula: <set name="children" table="CHILDREN"> <key column="PARENT_ID"/> <composite-element class="Child"> <property name="parentId" formula="PARENT_ID"/> </composite-element> </set> This works fine with the fix for HHH-539