SkeletonDebugger trial

package com.xpogames.movinghand;

import com.jme3.animation.AnimChannel;
import com.jme3.animation.AnimControl;
import com.jme3.app.SimpleApplication;
import com.jme3.font.BitmapText;
import com.jme3.light.DirectionalLight;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.scene.Spatial;
import com.jme3.scene.debug.SkeletonDebugger;

/**
 *
 * @author ufk
 */
public class MovingHand extends SimpleApplication {

  public static void main(String[] args){
        MovingHand app = new MovingHand();
        app.start(); // start the game
    }

    @Override
    public void simpleInitApp() {
    Spatial hand = assetManager.loadModel("Models/Worm/worm.j3o");
        Material mat_default = new Material(
            assetManager, "Common/MatDefs/Misc/ShowNormals.j3md");
        hand.setMaterial(mat_default);
        rootNode.attachChild(hand);
        hand.rotate(0,1f,1f);
        final AnimControl control = hand.getControl(AnimControl.class);

        final AnimChannel channel = control.createChannel();
        final SkeletonDebugger skeletonDebug = new SkeletonDebugger("skeleton", control.getSkeleton());
        final Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Green);
        mat.getAdditionalRenderState().setDepthTest(false);
        skeletonDebug.setMaterial(mat);
        rootNode.attachChild(skeletonDebug);
        // Create a wall with a simple texture from test_data
        // Display a line of text with a default font
        guiNode.detachAllChildren();
        guiFont = assetManager.loadFont("Interface/Fonts/Default.fnt");
        BitmapText helloText = new BitmapText(guiFont, false);
        helloText.setSize(guiFont.getCharSet().getRenderedSize());
        helloText.setText("Hello World - " + (control == null ? "is null" : "is not null"));
        helloText.setLocalTranslation(300, helloText.getLineHeight(), 0);
        guiNode.attachChild(helloText);

        // Load a model from test_data (OgreXML + material + texture)
        // You must add a light to make the model visible
        DirectionalLight sun = new DirectionalLight();
        sun.setDirection(new Vector3f(-0.1f, -0.7f, -1.0f));
        rootNode.addLight(sun);
   }
}