Inheritance and @AssociationOverride issue

Hibernate ORM
1

I’m getting the issue with @AssociationOverride combined with @OneToMany with mappedBy. So I have next hierarchy and classes:

@Entity
public class Link {
@JoinColumn(name = "from_event_id")
private Event fromEvent;

@JoinColumn(name = "from_super_event_id")
private SuperEvent fromSuperEvent;

@JoinColumn(name = "from_extra_event_id")
private ExtraEvent fromExtraEvent;
}

@Entity
public class Event {
   @OneToMany(mappedBy = "fromEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeft = new ArrayList<>();
}

@Entity
public class SuperEvent extends Event {
   @OneToMany(mappedBy = "fromSuperEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeft = new ArrayList<>();
}

@Entity
public class ExtraEvent extends SuperEvent {
   @OneToMany(mappedBy = "fromExtraEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeft = new ArrayList<>();
}

I need every of Event, SuperEvent and ExtraEvent pull their own linkLeft. But for both child classes mapping from basic class “fromEvent” always used.

I tried to declare @AssociationOverride for SuperEvent and ExtraEvent but app don’t want to start and raising the error: Property linksLeft is inherited from entity …Event and may not be overridden using ‘@AssociationOverride’ in entity subclass

Please advice any workaround for this. It’s obvious workaround to rename properties, but app infrastructure tied to this naming so it’s not a proper way so far.

Thank you

2

You have to name the attributes/fields differently e.g.

@Entity
public class Event {
   @OneToMany(mappedBy = "fromEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeftEvent = new ArrayList<>();
}

@Entity
public class SuperEvent extends Event {
   @OneToMany(mappedBy = "fromSuperEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeftSuperEvent = new ArrayList<>();
}

@Entity
public class ExtraEvent extends SuperEvent {
   @OneToMany(mappedBy = "fromExtraEvent", fetch = FetchType.LAZY)
   private List<Link> linkLeftExtraEvent = new ArrayList<>();
}
3

Thank you for the reply. Unfortunately,

 It’s obvious workaround to rename properties, but app infrastructure tied to this naming so it’s not a proper way so far.
4

You can still expose the data through the same getter methods, but the attributes/fields have to have a different name.