bug: [MacOS] - do not show the icon of the game

[jvondermarck]

Describe the bug
When I run the game on my mac, it shows the default jar folder icon. I don't know if it is a problem just from the .jar file in general, but since there is a method in FXGL to set the icon picture, why it wouldn't work on MacOS ?

To Reproduce
Steps to reproduce the behavior:

1. Run the .jar game on MacOS

Expected behavior
It should show the icon I set in the code, such as

@Override
protected void initSettings(GameSettings settings) {
    gui.initSettings(settings);
    settings.setAppIcon("icon.png");
    settings.setTitle("Dinosaur Exploder");
}

Screenshots

Runtime info(please complete the following information):

• OS and version: MacOS Sequoia 15.3.2 (24D81)
• FXGL version : 21

[AlmasB]

Hi, FXGL just calls JavaFX's stage.getIcons().add(...), so I would check whether a plain JavaFX application with a custom icon behaves correctly. Let me know if you get same / different results.

[jvondermarck]

Hi @AlmasB,
I saw this forum : https://datmt.com/backend/how-to-set-icon-on-dock-taskbar-for-javafx-application/

And it works the icon now but I have some issues :

1. The top bar is white while before it was dark
2. It does not quit the game anymore when I press the "red" button

Clipboard-20250421-170249-607.mp4

---

My code :

  @Override
    protected void initSettings(GameSettings settings) {
        gui.initSettings(settings);
        settings.setAppIcon("icon.png");
        if (System.getProperty("os.name").toLowerCase().contains("mac")) {
            // Only set dock icon on macOS
            try {
                if (Taskbar.isTaskbarSupported()) {
                    var taskbar = Taskbar.getTaskbar();
                    if (taskbar.isSupported(Taskbar.Feature.ICON_IMAGE)) {
                        var img = Toolkit.getDefaultToolkit().getImage(getClass().getResource("/assets/textures/icon.png"));
                        taskbar.setIconImage(img);
                    }
                }
            } catch (Exception ignored) {
                // fail silently on error
            }
        }
        settings.setTitle("Dinosaur Exploder");
    }

[AlmasB]

Hi,

1. perhaps the OS theme is not being used -- I'd check any documentation that comes with that code.
2. it looks like something is keeping it alive after shutdown. I'd check if there are any active, non-daemon threads running from where the new code comes from.