Re: EJB3 Help needed: @PrimaryKeyJoinColumn not working

Frank Langelage <>
Thu, 08 Nov 2007 21:23:57 +0100
Dave wrote:

I have to tables (FIELD and FIELDACCESS) in our DB that share the same
primary key. There is a one-to-one relationship from FIELD to
FIELDACCESS. I've read two accounts of how to setup the annotations
to get this relationship to work but I haven't been able to get either
of them to work. In both cases I have the same problem but I will
only present one case here.

The following is how "EJB3 In Action" says to do it:

@Table(name = "FIELDNAME")
public class Field implements Serializable {
    private static final long serialVersionUID = 1L;

    @Column(name = "fieldid")
    protected long oid;

    protected FieldAccess fieldAccess;


@Table(name = "FIELDACCESS")
public class FieldAccess implements Serializable {
    private static final long serialVersionUID = 1L;

    @Column (name = "fieldid")
    private long oid;

    public long getOid() {
        return this.oid;

The problem I'm having is with the "@OneToOne" annotation in Field. I
get the error "Join column 'fieldAccess_fieldid' cannot be resolved".
However, it appears to me that "fieldid" does exist in FieldAccess.

Try this:
@PrimaryKeyJoinColumns( {
   @PrimaryKeyJoinColumn( name = "fieldid",
    referencedColumnName = "fieldid" )
} )

The default naming of the FK in a 1:1 relation is <target entity
name>_<PK column name of target> -> fieldAccess_fieldid.
If you want something else you'll have to define it like above.

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