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[eclipselink-users] Please help: @OneToOne with @MapsId and @IdClass 
Hi,

I am trying to implement @OneToOne with @MapsId and @IdClass
(preferably in the most basic way possible).

If I could find a working example on the web then I would be happy.

My code does not work (maven sample project attached / available):

@Entity
@IdClass(value = RequiredPk.class)
public class Required implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Temporal(javax.persistence.TemporalType.DATE)
    private Date dateCeated;

    @Id
    private String name;

@Entity
@IdClass(value = RequiredPk.class)
public class Optional implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Temporal(javax.persistence.TemporalType.DATE)
    @Column(insertable = false, updatable = false)
    private Date dateCeated;

    @Id
    @Column(insertable = false, updatable = false)
    private String name;

    @OneToOne
    @MapsId
    private Required required;


public class RequiredPk implements Serializable  {

    private static final long serialVersionUID = 1L;

    private Date dateCeated;
    private String name;

....
final String name = "name";
final Date date = new Date();
Required required = new Required();
required.setName(name);
required.setDateCeated(date);
em.persist(required);
em.flush();
Optional optional = new Optional();
optional.setRequired(required);
em.persist(optional);



Exception Description: Trying to set value [RequiredPk{dateCeated=Sat
Jul 05 18:03:03 NZST 2014, name=name}] for instance variable [name] of
type [java.lang.String] in the object.  The specified object is not an
instance of the class or interface declaring the underlying field, or
an unwrapping conversion has failed.
Internal Exception: java.lang.IllegalArgumentException: Can not set
java.lang.String field mapsid.entity.Optional.name to
mapsid.entity.RequiredPk
Mapping:
org.eclipse.persistence.mappings.DirectToFieldMapping[name-->OPTIONAL.DATECEATED]
Descriptor: RelationalDescriptor(mapsid.entity.Optional -->
[DatabaseTable(OPTIONAL)])
	at
org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:499)


What would be your recommendation in this scenario? I found that
EclipseLink / JPA has simple solutions for most cases so I guess I am
just missing something.


Many thanks!

Bernard



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Attachment: OneToOneMapsIdIdClass.zip
Description: Binary data

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