Hi,
I'm trying to persistent an existing code base. While it works really
well, I've one situation I cannot solve.
Few classes contain some "collection of interfaces". The target entities
are not classes, but java interfaces like this:
private Collection<Employable> employees = new ArrayList<Employable>();
I know that I can specify the element type of the target with
"targetEntity=Employee.class". But of course this only works if there is
an one-to-one correlation between the interface Employable and the class
Employee. But I have more than one class implementing the Employable
interface.
While with OneToOne relations I could specify directly the java
interface as the targetEntity, I have no real success with one-to-many
relations. In every case the content of the relationship is stored as a
BLOB inside of my class with the warning "openjpa.MetaData - OpenJPA
cannot map field ...".
As far as I've understood, the JPA spec is not covering this aspect.
Anyways I'm wondering if I'm the only one with the problem. Is there a
way to make the one-to-many relation with interfaces work as the
one-to-one relation or am I misunderstanding something?
Thanks very much,
Christian Neumann
