I have a problem with extending entity classes and OneToMany relations. (The problem is not the same as http://jboss.com/index.html?module=bb&op=viewtopic&t=111688) My superclass, Inventory, has a column, station, which is used to map a relation with the Station entity | public class Station implements Serializable { | @OneToMany(cascade = ALL, mappedBy = "station") | private Set<InventoryType1> inventory1 = new HashSet<InventoryType1>(0); | } | | public class Inventory implements Serializable { | /** Station */ | @ManyToOne | @JoinColumn(name = "station_id") | private Station station; | } | | public class InventoryType1 extends Inventory implements Serializable { | } | This fails with a anonymous wrote : org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: Inventory1.station in Station.inventory1 As Inventory1 has no station column. In my opinion is has, as it inherits the columns of Inventory. I could probably work around this by moving the station_id to each sub entity, but it really belongs in the super class as it's common for all Inventory types. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063933#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...