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

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.