package test;

import java.net.URL;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import test.resources.FXMLDocumentController;

public class Test extends Application
{
    
    @Override
    public void start(Stage stage) throws Exception
    {        
        Scene scene = new Scene(getParent());
        stage.setScene(scene);
        stage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        launch(args);
    }
    
    private Parent getParent() throws Exception
    {
        String sceneFile = "resources/FXMLDocument.fxml";
        Parent root = null;
        URL    url  = null;
        try
        {
            url  = getClass().getResource(sceneFile);
            FXMLLoader loader = new FXMLLoader(getClass().getResource(sceneFile));
            root = loader.load();
        }
        catch ( Exception ex )
        {
            System.out.println("    ----------------------------------------\n");            
            System.out.println("Exception on FXMLLoader.load()" );
            System.out.println("Current path to scene: " + sceneFile);
            System.out.println("  * url: " + url );
            System.out.println("  * " + ex );
            System.out.println("    ----------------------------------------\n" );
            throw ex;
        }        
        return root;
    }    
}

package test.resources;

import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;

public class FXMLDocumentController implements Initializable
{
    
    @FXML
    private Label label;
    
    @FXML
    private void handleButtonAction(ActionEvent event)
    {
        System.out.println("You clicked me!");
        label.setText("Hello World!");
    }
    
    @Override
    public void initialize(URL url, ResourceBundle rb)
    {
        
    }        
}

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="test.resources.FXMLDocumentController">
    <children>
        <Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
        <Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
    </children>
</AnchorPane>