@RunOnFxThread

@RunOnFxThread annotation offers for a convenient way to execute the target on JavaFX UI thread (JavaFX Application Thread).

Annotation can be applied on method level or on class level (to mark all methods within a class)

Example

VBox vBox = new VBox();

public void start(@Observes final FxStartupEvent event) {

    Stage = event.getPrimaryStage();

    Scene scene = new Scene(this.vBox);
    stage.setScene(scene);
    stage.show();

    try (ExecutorService executorService = Executors.newVirtualThreadPerTaskExecutor()) {
        executorService.submit(() -> this.showNode(this.createExpensiveNode()));
    }
}

Node createExpensiveNode() {(1)
    return new Label(LocalTime.now().toString());
}

@RunOnFxThread
void showNode(final Node node) {(2)
  this.vBox.getChildren().add(node);
}

1	`createExpensiveNode` method will be executed in a thread from executor service
2	`showNode` method will be executed on JavaFx UI thread (JavaFX Application Thread)