Restarting a JavaFx App (probably unsafe)

ReloadApp.java

package com.isp.stackoverflow;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 * https://stackoverflow.com/questions/35858903/how-to-reload-an-application-in-javafx
 *
 * @author okr
 * @date 08.03.2016
 *
 */
public class ReloadApp extends Application
{
  boolean state = true;

  @Override
  public void start( final Stage primaryStage )
  {
    System.out.println( "state is " + state );
    playGame();
    System.out.println( "state is " + state );

    final Button restartButton = new Button( "Restart" );
    restartButton.setOnAction( __ ->
    {
      System.out.println( "Restarting app!" );
      primaryStage.close();
      Platform.runLater( () -> new ReloadApp().start( new Stage() ) );
    } );
    primaryStage.setScene( new Scene( new StackPane( restartButton ) ) );
    primaryStage.show();
  }

  /**
   * Simulate a game play by changing the global state.
   */
  private void playGame()
  {
    state = false;
  }

  /**
   * @param args ignored.
   */
  public static void main( final String[] args )
  {
    launch( args );
  }
}

thank you!