Hi friend.
This post is to use the collective memory (for future questions) to remember a behavior breaking-change difficult to find.

Like you know with NH2.0.0 we have introduced some improvement about cascade.
There is a special situation for "refresh" cascade using collection.
Cascade "all" or "all-delete-orphan" include the "refresh".
"refresh" mean that NH rereads the state of associated objects from the database when an object is passed to refresh.

When the relation with the object is passed to refresh is an aggregation (a list for example) NH2.0.0 refresh all related objects inside the aggregation before refresh the aggregation owner.
This feature mean:
1)same behavior of H3.2
2)at the end an old TODO, for cascade and events, was removed
3)fix NH-1362.

Now what happen if we have something in sessionCache and another session delete an object of the collection and we use refresh ?
(NHibernate.Test.Legacy.MasterDetailTest.CachedCollectionRefresh)
When NH intent the refresh of each element of the aggregation an exception will throw because we are attempt to refresh a deleted entity.

To prevent this situation we can't use "refresh" to define the cascade of the aggregation that mean we can't use "all".
A possible combination is, for example : cascade="save-update,delete" or cascade="save-update,delete-orphan"
Others combination can work but we must remember the exclusion of "refresh".

I hope that the situation is not so usual but I know that the "all" and "all-delete-orphan" is very usual so the situation have a good probability to happen.

--
Fabio Maulo
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