[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Hibernate and @CollectionId

[alexg79]

Could someone help me understand why @CollectionId is required for multiple simultaneous bag fetching? All it does is create an invisible primary key for the collection. I understand this in the case of unidirectional relationships, but if I have a bidirectional relationship, what purpose does this serve, since the referenced entity already has a primary key? Why can't hibernate use the target entity's existing primary key?

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