The persisted values in the EntityState class for the collection are copied to the LinkedList in the savePersistedValue() method. As a result, by defining a collection of type Set in an entity tagged with the @ColumnDefinition(updateable = false) annotation, the SaveProcessor method for restoring values is executed. As this is done via the reflection mechanism, the application gives an error about not being able to assign a collection of type Set to a collection of type LinkedList.