Hi there
I just wondering from Hibernate document chapter16 about parent/child example as I quote
below:

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If an object that was removed from a collection is an instance of a value type (eg, a composite element), that object will cease to be persistent and its state will be completely removed from the database. Likewise, adding a value type instance to the collection will cause its state to be immediately persistent.
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On the other hand, if an entity is removed from a collection (a one-to-many or many-to-many association), it will not be deleted, by default. This behaviour is completely consistent - a change to the internal state of another entity should not cause the associated entity to vanish! Likewise, adding an entity to a collection does not cause that entity to become persistent, by default.

so, my question is, what actually the different between object and entity?
Thanks

A value type is a <composite-element> or <element>, a entity an association via <many-to-many> or the likes - just like it is explained in the text you posted.

Thanks mate,.... :-) that was my mistake