Hi,

I've a problem of how to define the database-mapping using annotations for the following problem:

@Enitity
class FooBar{

@Id
@GeneratedValue
Long id;

@???? which one here ????
protected Map<Integer, List<FooBar>> childs = new HashMap<Integer, List<FooBar>>();

//....
}

I've worked (to some part) through Bauers "Java Persistence", but the section about Map-mapping (7.2.4) just handles the case of entities being the map-values. If the entities are within a list, the problem is obviously different, but I don't have any clue of how to define the data-base mapping here.

Any ideas? links to additional literature? similar examples?

Thanx in advance, best regards,
Watzlaw

I don't think it is possible to map a Collection of Collections to the database, this means it is not possible to have a collection within another collection (i.e. a List within a Map).

Cheers,

Andy