import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Popup;
import javafx.stage.Stage;

public class TestFX extends Application {

@Override
public void start(Stage primaryStage) {
System.out.println("javafx.runtime.version: " + System.getProperties().get("javafx.runtime.version"));
Stage stage = new Stage();
Scene scene = new Scene(new StackPane());
stage.setScene(scene);
stage.show();
Popup popOver = new Popup();
for (int i = 0; i < 99999; i++) {
popOver.show(scene.getRoot(), 1, 1);
popOver.hide();
System.out.println(i);
}
}

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