FULL PRODUCT VERSION :
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.14393]

A DESCRIPTION OF THE PROBLEM :
I'm using a ListView with getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE) and have added a ListChangeListener to getSelectionModel().getSelectedIndices(). The listener receives the Change c and prints the changed list twice with System.out.println(c.getList().toString() + " " + c.getList().toString()). Both strings should be equal, but in some cases they're not, for example [-1] [2]. The first string is wrong in this cases.

I created a similiar ticket last year (JDK-8147820).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. press and hold ctrl
2. select 1st row with a mouse click
3. select 3rd row with a mouse click
4. deselect 1st row with a mouse click


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The printed strings should be equal.
ACTUAL -
The printed strings are unequal.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class ListViewExample extends Application {

    private void init(Stage primaryStage) {
        VBox root = new VBox(2);
        primaryStage.setScene(new Scene(root, 300, 300));

        final ObservableList<String> data = FXCollections.observableArrayList(
                "Jacob Smith",
                "Isabella Johnson",
                "Ethan Williams");


        ListView listView = new ListView();
        listView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
        listView.setItems(data);

        listView.getSelectionModel().getSelectedIndices().addListener(
                (ListChangeListener) c -> System.out.println(c.getList().toString() + " " + c.getList().toString())
        );

        root.getChildren().addAll(listView);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.setTitle("List Test " + System.getProperty("javafx.runtime.version"));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Just iterate over the list before using it.