[FIXED] How to replace the methode StageHelper.getStages() from java 1.7 to java 11

Issue

I am migrating an application which using JavaFX from Java 1.7 to Java 11. One of the error that I have is about the method StageHelper.getStages() which has disappeared. I did not find anything to replace it. Do you have a solution to replace this method ? Thank you for your help ! :)

Solution

StageHelper has been always private API, as it was part of com.sun.javafx.stage. As such, you should be aware that private API can be changed or removed at anytime without notification.

For Java 1.7 I can't say, JavaFX (2.2?) wasn't open sourced at that time.

For Java 1.8, the StageHelper.getStages() method can be found here.

For Java 1.9 however, StageHelper, defined here, doesn't include getStages anymore.

The reason for that can be found in this issue JDK-8156170: Clean up Stage and StageHelper.

If you read the description, as part of the issue they will:

Remove getStages() and make caller of this method to use public API Window.getWindows().

Alternatives

As mentioned in that issue, since JavaFX 9 you have this public method Window.getWindows(), that will

return a list containing a reference to the currently showing JavaFX windows

Note that a Window can be a Stage or a PopupWindow, so maybe you can filter them out:

List<Stage> stages = Window.getWindows().stream()
            .filter(Stage.class::isInstance)
            .map(Stage.class::cast)
            .collect(Collectors.toList());

Answered By - José Pereda
Answer Checked By - David Marino (JavaFixing Volunteer)