How to capture event for forcefully quit or unexpected close in JavaFx?

Question

I am making a desktop application which has login and logout functionality with server.

I need to logout from the application whenever someone close the window, so I am using these codes

primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
                @Override
                public void handle(WindowEvent event) {
                    event.consume();
                    closeWindow();
                }
            });

where closeWindow() contains logout and other related steps.

Now there is a problem when application closes unexpectedly or when someone forcefully quit/close it from Task Manager (by ending process).

Do JavaFX has any event to capture forcefully quit or unexpected close ? Or if there any method to stop it ?

Answer 1

When your application gets closed via TaskManager your only option will be to use the VM's shutdown hook.

There are some examples around, e.g. here.

Answer 2

There is a method

@Override
public void stop() throws Exception {
    super.stop();
    System.out.println("logout");
}

in Application class.

Answer 3

public class Gui extends Application {

    static {
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                closeWindow();
            }
        });
    }

    @Override
    public final void start(Stage primaryStage) throws Exception {
        // ...
    }

    @Override
    public void stop() throws Exception {
        // ...
        System.exit(0);
    }
}