[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - How to map collection of entity ids

[jamestang]

Let's say Factory.java and Product.java are entity classes.
There is a one-to-many unidirectional relationship from Factory to Product.

  | @Entity
  | public class Factory implements Serializable {
  |     @Id
  |     private Long id;
  | 
  |     // This is a collection of Product ids.  How to map this???
  |     private List<Long> productIds;
  |     ......
  | }
  | 
  | @Entity
  | public class Product implements Serializable {
  | 
  |     @Id
  |     private Long id;
  |     ......
  | }
  | 

My question is: how to write the mapping metadata for Factory.productIds?
(I know List< Long > can't be persisted. But how can JPA solve this simple case?)

TIA.

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