2.8.1. Collections as a value type

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Value and embeddable type collections have a similar behavior as simple value types because they are automatically persisted when referenced by a persistent object and automatically deleted when unreferenced.
If a collection is passed from one persistent object to another, its elements might be moved from one table to another.

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Two entities cannot share a reference to the same collection instance.
Collection-valued properties do not support null value semantics because Hibernate does not distinguish between a null collection reference and an empty collection.

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