A Red Hat customer is running EAP7 that has Hibernate 5.0.x and at the beginning "2.8.12. Custom collection types" chapter documentation it is introducing confusion and misunderstanding, as the custom collection types are is introduced after hibernate 5.2.x release.
"Hibernate uses its own collection implementations which are enriched with lazy-loading, caching or state change detection semantics. For this reason, persistent collections must be declared as an interface type. The actual interface might be java.util.Collection, java.util.List, java.util.Set, java.util.Map, java.util.SortedSet, java.util.SortedMap or even other object types (meaning you will have to write an implementation of org.hibernate.usertype.UserCollectionType)."
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