@PrimaryKeyJoinColumn with bidirectional @OneToOne relationship and @Id

[Theodore David Williams]

I want to have a dependent object share the primary key of its parent.

I.E with tables
Table Parent
int PARENT_ID // primary key
String NAME

Table Child
int PARENT_ID // primary key, same as parent's primary key
String NAME

I read somewhere that hibernate allows the @Id annotation with a @OneToOne annotation (Is this only with a newer version of hibernate? I am running 3.2.4.sp1 (comes with jboss 4.2.3.))

So I have the following two entities:

    
@Entity
@Table(name = "PARENT")
})
public class Parent implements java.io.Serializable {
	
	private long parentId;
	private String name;
	private Child child;

	public Parent() {
	}

	@Id
	@Column(name = "PARENT_ID", unique = true, nullable = false, scale = 0)
	@GeneratedValue( strategy=GenerationType.SEQUENCE, generator="GS_PARENT_GEN" )
	@SequenceGenerator( name="GS_PARENT_GEN", sequenceName="GS_PARENT", allocationSize=1 )
	public long getParentId() {
		return this.parentId;
	}

	public void setParentId(long parentId) {
		this.parentId= parentId;
	}

       @OneToOne(fetch=FetchType.EAGER, mappedBy = "parent", cascade = CascadeType.ALL)
          public Child getChild() {
          return this.child;
       }
    
       public void setChild(Child child) {
          this.child = child;
      }

    @Column(name="NAME", nullable=false)
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }

   
@Entity
@Table(name="CHILD")
public class Child {

    private Parent parent;
    private String name;

    public Child() {
    }
    
    
	@Id
    @OneToOne(fetch = FetchType.LAZY)
	@PrimaryKeyJoinColumn(name = "PARENT_ID")
    public Parent getParent() {
        return this.parent;
    }
    
    public void setParent(Parent parent) {
        this.parent = parent;
    }
    
    @Column(name="NAME", nullable=false)
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
}

But I get the following error from hibernate:

   
org.hibernate.AnnotationException: Referenced property not a (One|Many)ToOne: com.test.entities.Child.parent in mappedBy of com.test.Parent.child

Any ideas? I this a hibernate problem (i.e. I need a newer version) or is there a flaw in the code?