If you have a TreeView with a selected TreeItem, and then remove all TreeItems, I get the following exception:

java.lang.IndexOutOfBoundsException: bitIndex < 0: -1
at java.util.BitSet.clear(BitSet.java:532)
at javafx.scene.control.MultipleSelectionModelBase.clearSelection(Unknown Source)
at javafx.scene.control.TreeView$TreeViewBitSetSelectionModel$2.handle(Unknown Source)
at javafx.scene.control.TreeView$TreeViewBitSetSelectionModel$2.handle(Unknown Source)
at com.sun.javafx.scene.control.WeakEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.control.TreeItem.fireEvent(Unknown Source)
at javafx.scene.control.TreeItem.updateChildren(Unknown Source)
at javafx.scene.control.TreeItem.access$100(Unknown Source)
at javafx.scene.control.TreeItem$2.onChanged(Unknown Source)
at com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(Unknown Source)
at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(Unknown Source)
at com.sun.javafx.collections.ObservableListWrapper.callObservers(Unknown Source)
at com.sun.javafx.collections.ObservableListWrapper.remove(Unknown Source)



To reproduce, run the code. Then select an item, and remove all items via the menu. The exception isn't always thrown, but in most cases. (I don't get the error, when I select the sub item of the first tree item "TreeItem 1").
It probably affects other controls, which use the selection model, too.



import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class TestApp3 extends Application {
    public static void main(String[] args) throws Exception {
        launch(args);
    }

    public void start(final Stage stage) throws Exception {

        VBox root = new VBox();

        final TreeItem<String> rootNode = new TreeItem<String>();
        TreeView<String> treeView = new TreeView<String>(rootNode);
        treeView.setShowRoot(false);

        for (int i = 0; i < 10; i++) {
            TreeItem<String> item = new TreeItem<String>();
            item.setValue("TreeItem" + i);

            TreeItem<String> subItem = new TreeItem<String>();
            subItem.setValue("SubItem");
            item.getChildren().add(subItem);
            item.setExpanded(true);
            rootNode.getChildren().add(item);
        }

        MenuBar menuBar = new MenuBar();
        Menu menu = new Menu("Menu");
        MenuItem menuitem = new MenuItem("Remove all items");
        menu.getItems().add(menuitem);

        menuitem.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                for (int i = 9; i >= 0; i--)
                rootNode.getChildren().remove(i);
            }
        });

        menuBar.getMenus().add(menu);

        root.getChildren().addAll(menuBar, treeView);

        Scene scene = new Scene(root, 500, 500);
        stage.setScene(scene);
        stage.show();
    }
}