Question

I have to map the interface as entity to use different implementations in collections.

@Entity
@Table(name = "OPTION")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "TYPE", discriminatorType = DiscriminatorType.STRING)
public interface FilterOption {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Long getId();
    public void setId(Long id);
    public Object getValue();
...
}

I’m recieving an error :

Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence
Services – 2.2.0.v20110202-r8913):
org.eclipse.persistence.exceptions.ValidationException Exception
Description: Entity class [class
FilterOption] has no primary
key specified. It should define either an @Id, @EmbeddedId or an
@IdClass.

As you can see the @Id is declared. How can I fix this problem?

Answer 1

you can’t map entities to interfaces using annotations with eclipselink, apparently.

In fact, you can’t map an entity to an interface at all using jpa or hibernate.