public @Interface AssociationOverrides

@MappedSuperclass
public class Employee {

    @Id
    protected Integer id;
    @Version
    protected Integer version;
    @ManyToOne
    protected Address address;
    @OneToOne
    protected Locker locker;

    public Integer getId() { ... }
    public void setId(Integer id) { ... }
    public Address getAddress() { ... }
    public void setAddress(Address address) { ... }
    public Locker getLocker() { ... }
    public void setLocker(Locker locker) { ... }
    ...
}

@Entity
@AssociationOverrides({
    @AssociationOverride(
               name = "address",
               joinColumns = @JoinColumn("ADDR_ID")),
    @AttributeOverride(
               name = "locker",
               joinColumns = @JoinColumn("LCKR_ID"))})
public PartTimeEmployee { ... }