java.lang.ClassCastException: java.util.HashSet cannot be cast to org.hibernate.collection.PersistentCollection

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java.lang.ClassCastException: java.util.HashSet cannot be cast to org.hibernate.collection.PersistentCollection
at org.hibernate.event.def.FlushVisitor.processCollection(FlushVisitor.java:57)
at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:122)

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