SimpleObjectProperty can hold a property that is mutable and complex. If the property is set to a different object that ".equals()" the previous object the listeners are not notified. One area where this is a problem is in the case of SimpleObjectProperty<ObservableList<?>>. It is essential to receive notifications for changes to the property so that client code can remove listeners from the old list and add them to the new list. If clients added listeners to the initial list while it was still empty and the list is changed to a new empty list, clients are not notified that the list object has changed and there is no way for them to know that they should remove listeners from the old list and add them to the new one. TableView.itemsProperty() has the same issue.

Problem reproduced in the attached file