Example of module-info.java

    
module example.myfirstjavafxproject {
    requires javafx.controls;
    requires javafx.fxml;

    opens example.myfirstjavafxproject to javafx.fxml;
    exports example.myfirstjavafxproject;
}
    

Example of main class

    
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.io.IOException;

public class HelloApplication extends Application 
{
    @Override
    public void start(Stage stage) throws IOException 
    {
        FXMLLoader fxmlLoader = 
            new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
        Scene scene = new Scene(fxmlLoader.load(), 320, 240);
        stage.setTitle("Hello!");
        stage.setScene(scene);
        stage.show();
    }

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