Steps to Reproduce

Run keikai app
Call:
bookManager.readBook(new SimpleBookInfo("yourBookHere.xlsx")).cloneBook();

Where the book contains a Validation or conditional formatting

Current Result

org.apache.poi.ss.formula.LazyAreaEval (if xlsx document contains data validation)
or
java.io.NotSerializableException: io.keikai.app.ui.AppCtrl$4 (if it doesn't)

Expected Result

clone doesn't cause serialization exceptions

Debug Information

ValidationImpl has non-serializable non-transient fields:
private ValueEval _evalValue1EvalResult;
private ValueEval _evalValue2EvalResult;

BookImpl has non-serializable non-transient fields:
private EventListenerAdaptor _listeners;
private EventListenerAdaptor _queueListeners;
private EvaluationContributor _evalContributor;

Workaround

• Use export to xlsx and reimport
• copy an xlsx file