Gentoo doesn't run a Java (Flash) application but Ubuntu yes

Question

Hello everybody.
I can't find a solution to a Java-Flash-Gentoo related problem.
I would like to run a Java program, using an [external library|http://djproject.sourceforge.net/ns/] , to realize a Java FlashPlayer. This is the code of the player:
package testplayer;
import chrriis.dj.nativeswing.swtimpl.NativeInterface;
import chrriis.dj.nativeswing.swtimpl.components.JFlashPlayer;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main implements Runnable {
    public static void main(String[] args) {
        NativeInterface.open();
        EventQueue.invokeLater(new Main());
        NativeInterface.runEventPump();
    public void run() {
        JFlashPlayer player = new JFlashPlayer();
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(player);
        JFrame window = new JFrame("Test");
        window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        window.add(panel);
        window.setSize(400, 400);
        window.setVisible(true);
        player.load("http://www.youtube.com/v/XyX-KJwUohw");
}A window should be opened and the youtube video should play as well. Here's what I get on Gentoo Linux.
[http://i.imgur.com/XyYdk.png]
It doesn't find the flash plugin actually, even though it is installed and properly working.
My Gentoo is x86_64 architecture and if I try to run the same application on Ubuntu (x86_64), it works like a charm.
At the moment my www-plugins/adobe-flash USE flags are the following: 64bit -32bit.
Why this piece of code runs on Ubuntu and on Gentoo not????
Could it be something related to some environment variable?
Thanks a lot!

Answer 1

I asked to the mantainers yet actually, but they didn't solve me the problem at the moment.
Perhaps some of you could have an idea of what I am missing on Gentoo.
What I can tell you, is that I tried to run that application on a fresh Debian installation and I've got the same problem.
So this happens because of something that is missing. But what?? :(