Hey guys, I've found a bug in the "Compound Primary Keys" implementation in JBoss/Hibernate EJB3. I've been able to reproduce this problem on JBoss 4.0.4GA and jboss-EJB-3.0_Embeddable_ALPHA_9. Current implementation generates extra field from compound key. This is an example from Sun's "The Java EE 5 Tutorial" http://java.sun.com/javaee/5/docs/tutorial/doc/PersistenceEJB2.html | @IdClass(order.entity.LineItemKey.class) | @Entity | @Table(name = "EJB_ORDER_LINEITEM") | public class LineItem { | @Id | public int getItemId() { | return itemId; | } | @Id | @Column(name="ORDERID", nullable=false, insertable=false, updatable=false) | public Integer getOrderId() { | return orderId; | } | } | | public final class LineItemKey implements java.io.Serializable { | | private Integer orderId; | private int itemId; | ... | public Integer getOrderId() { | return orderId; | } | ... | } | This generates following SQL in logs: | DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] Snapshot select: select lineitem_.orderId, lineitem_.itemId, lineitem_.ORDERID as ORDERID9_, lineitem_.quantity as quantity9_, lineitem_.VENDORPARTNUMBER as VENDORPA4_9_ from EJB_ORDER_LINEITEM lineitem_ where lineitem_.orderId=? and lineitem_.itemId=? | DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] Insert 0: insert into EJB_ORDER_LINEITEM (ORDERID, quantity, VENDORPARTNUMBER, orderId, itemId) values (?, ?, ?, ?, ?) | DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] Update 0: update EJB_ORDER_LINEITEM set ORDERID=?, quantity=?, VENDORPARTNUMBER=? where orderId=? and itemId=? | DEBUG [org.hibernate.persister.entity.AbstractEntityPersister] Delete 0: delete from EJB_ORDER_LINEITEM where orderId=? and itemId=? | | OR | | insert into EJB_ORDER_LINEITEM (ORDERID, quantity, VENDORPARTNUMBER, orderId, itemId) values (?, ?, ?, ?, ?) | As you can see there are duplicationg columns: ORDERID from LineItem class and orderId from LineItemKey. When I add @Column annotation to the LineItemKey: | public final class LineItemKey implements java.io.Serializable { | | private Integer orderId; | private int itemId; | ... | @Column(name="ORDERID", nullable=false, insertable=false, updatable=false) | public Integer getOrderId() { | return orderId; | } | ... | } | I got exception: | org.hibernate.MappingException: Repeated column in mapping for entity: order.entity.LineItem column: ORDERID (should be mapped with insert="false" update="false") | at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:575) | I believe this is connected to Hibernate bug HBX-164 http://opensource.atlassian.com/projects/hibernate/browse/HBX-164 Should I file a bug to JBoss or Hibernate JIRA? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979240#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...