As Oracle says, JavaFX is the future - I hope soon as possible, cause I am really happy with what I am seeing.
Take a look at http://www.oracle.com/us/technologies/java/fx/overview/index.html


I decided to download this tool JavaFX Scene Builder 1.0 to help me out with the FXML .
http://www.oracle.com/technetwork/java/javafx/downloads/index.html

and build 2 fxml files:


LMLFrameFX.fxml

<?xml version="1.0" encoding="UTF-8"?>
<?language javascript?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.chart.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<?scenebuilder-background-color 0xdfdfdfff?>


<AnchorPane id="AnchorPane" 
            maxHeight="-Infinity" maxWidth="-Infinity" 
            minHeight="-Infinity" minWidth="-Infinity" 
            prefHeight="400.0"    prefWidth="600.0" 
            xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2"
            fx:controller="FXController"
            >

  <children>
    
    <Button layoutX="22.0" layoutY="355.0" 
            mnemonicParsing="false" prefHeight="31.0" prefWidth="158.0" 
            text="click here" 
            onAction="java.lang.System.out.println('You clicked me!');"
            />
            
    <Button layoutX="222.0" layoutY="355.0" 
            mnemonicParsing="false" prefHeight="31.0" prefWidth="158.0" 
            text="click here" 
            />
            
    <Accordion expandedPane="$null" layoutX="331.0" layoutY="14.0" prefHeight="324.0" />
    <Accordion layoutX="396.0" layoutY="22.0" prefHeight="378.0">
      <expandedPane>
        <TitledPane fx:id="x1" animated="false" text="untitled">
          <content>
            <AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0" />
          </content>
        </TitledPane>
      </expandedPane>
      <panes>
        <TitledPane animated="false" text="untitled">
          <content>
            <AnchorPane id="Content" minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
              <children>
                <Slider layoutX="0.0" layoutY="33.0" orientation="VERTICAL" prefWidth="69.0" />
                <Slider layoutX="69.0" layoutY="33.0" orientation="VERTICAL" prefWidth="69.0" />
                <Slider layoutX="132.0" layoutY="33.0" orientation="VERTICAL" prefWidth="69.0" />
              </children>
            </AnchorPane>
          </content>
        </TitledPane>
        <fx:reference source="x1" />
      </panes>
    </Accordion>
    
    
    
    
    <MenuBar layoutX="0.0" layoutY="0.0" 
       opacity="0.6" prefWidth="600.0"
        >
      <menus>
        <Menu mnemonicParsing="false" text="File">
          <items>
            <MenuItem mnemonicParsing="false" text="Close" />
          </items>
        </Menu>
        <Menu mnemonicParsing="false" text="Help">
          <items>
            <MenuItem mnemonicParsing="false" text="About" />
          </items>
        </Menu>
      </menus>
    </MenuBar>
    
    
    <BarChart layoutX="0.0" layoutY="33.0" prefHeight="300.0" prefWidth="396.0">
      <xAxis>
        <CategoryAxis side="BOTTOM" />
      </xAxis>
      <yAxis>
        <NumberAxis side="LEFT" />
      </yAxis>
    </BarChart>

    
  </children>
  
</AnchorPane>

and
TestFrameFX.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?language javascript?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.chart.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<?import javafx.scene.control.Label?>
<?scenebuilder-background-color 0xdfdfdfff?>

<StackPane prefHeight="150.0" prefWidth="200.0" 
           xmlns:fx="http://javafx.com/fxml" 
           fx:controller="FXController"
           >
 <children>
    <Button fx:id="myButton" mnemonicParsing="false" text="Button" onAction="#handleButtonAction" />
 </children>
</StackPane>

and 2 classes

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

public class FxmlLoaderLML extends Application {
    
    public static void main(String[] args) {
        Application.launch(FxmlLoaderLML.class, args);
        //launch(args);
    }
    
    @Override
    public void start(Stage stage) throws Exception {
    System.out.println("resourse fxml:" + this.getClass().getResource("LMLFrameFX.fxml").getFile());
   
    /* FRAME 1   LMLFrameFX.fxml */
        Parent root = FXMLLoader.load( this.getClass().getResource("LMLFrameFX.fxml")  );
        stage.setTitle("FXML LOADER");
        stage.setScene(new Scene(root, 600, 400));
        stage.show();
        
        /* FRAME 2   TestFrameFX.fxml*/
        Parent root2 = FXMLLoader.load( this.getClass().getResource("TestFrameFX.fxml")  );
        Stage s2 = new Stage();
        s2.setTitle("FXML LOADER");
        s2.setScene(new Scene(root2, 300, 100));
        s2.show();
    }
}

import javafx.event.*;

public class FXController {

    public void handleButtonAction(ActionEvent event) {

        System.out.println("FXController says : clicked!");

    }

    

}

Then I develop and test this simple "HelloWorldProject" on Eclipse 4.2.2 64bits , NetBeans 7.3.1 and calling strait from DOS Console using a little bat file like:
set classpath=..\JavaFXSceneBuilder1.1\runtime\jre\bin;..\JavaFXSceneBuilder1.1\runtime\jre\lib;..\javafx\bin;..\JavaFXSceneBuilder1.1\runtime\jre\lib\jfxrt.jar;
set path=%path%;%classpath%
java -cp %classpath% HelloWorld

but of course, the moderns IDE are easier
so let's see the Eclipse graphinterface here..

As you can see here, you must to use java 7
 in my case
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)



Those are the links that help me out.

http://docs.oracle.com/javafx/2/get_started/FXMLExample.java.html
https://blogs.oracle.com/jmxetc/entry/connecting_scenebuilder_edited_fxml_to
http://docs.oracle.com/javafx/2/api/javafx/fxml/doc-files/introduction_to_fxml.html#fxml_annotation
http://docs.oracle.com/javafx/2/get_started/basic_deployment.htm