Replacing the last element (which sorting has changed) of an ObservableList wrapped by a SortedList gives an exception (see attached file for test case):

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at javafx.collections.SortedList.removeSorted(SortedList.java:119)
at javafx.collections.SortedList.onSourceChanged(SortedList.java:248)
at javafx.collections.TransformationList$1.onChanged(TransformationList.java:83)
at com.sun.javafx.collections.ObservableListWrapper.callObservers(ObservableListWrapper.java:62)
at com.sun.javafx.collections.ObservableListWrapper.set(ObservableListWrapper.java:196)
at deepobservable.TestSortedList.main(TestSortedList.java:37)

The reason to replace the element with itself is to trigger the resort. See also http://forums.oracle.com/forums/thread.jspa?messageID=9692547#9692547