When ActionQueue.insertions is serialized/deserialized, insertions.sorter} is not serialized/deserialized. After {{insertions is serialized/deserialized, insertions.sorter will be null (not an instance of InsertActionSorter as it should be).

If hibernate.order_inserts=true, then insertions.sort() will be sorted using Collections.sort(executables) (not insertions.sorter.sort( executables ).