Hi all!
I'm new to this NG so I'll try to explain my problem.
I'm using JAVA3D into a JApplet. This is the code

[CODE]
import java.util.*;
import java.net.*;

import java.awt.*;

import javax.swing.*;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;

import javax.media.j3d.*;
import javax.vecmath.*;

...

public class OSESKeyNav extends JApplet
{
       private static final int WINDOW_WIDTH = 800;
       private static final int WINDOW_HEIGHT = 700;
       
       private static URL url = null;
       
       private int simulationStage = 0; // 0->init, 1->prima visualizzazione
       
       private Receiver receiver;
       private Sender sender;
       private ObjectsUpdater updater;
       
       private HashMap objList;
       
       private UniverseManager universe;
       
       private Camera camera;
       
       public OSESKeyNav() { }
       
   public OSESKeyNav( String host )
   {
       receiver = new Receiver( host );

       objList = new HashMap();
       
       setLayout(new BorderLayout());
       
           GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
       
           Canvas3D canvas3D = new Canvas3D( config );
       canvas3D.setSize( WINDOW_WIDTH, WINDOW_HEIGHT );
       add("North", canvas3D);
               
       universe = new UniverseManager();
       
       createSceneGraph();
       
       updater = new ObjectsUpdater( objList, receiver );
               updater.start();
               
               addCamera( canvas3D );
               
       universe.makeLive();
   }

   private void createSceneGraph()
   {
       ...
   }
   
   private void addCamera( Canvas3D canvas )
   {
       ....
   }
   
       
       public void init()
       {
               url = getCodeBase();
       String host = url.getHost();
       
       OSESKeyNav applet = new OSESKeyNav( host );
       new MainFrame(applet, WINDOW_WIDTH, WINDOW_HEIGHT);
           
           
       }

}
[/CODE]

When I try to view this applet with my browser JVM returns this exception

java.security.AccessControlException: access denied
(java.util.PropertyPermission * read,write)
       at java.security.AccessControlContext.checkPermission(Unknown Source)
       at java.security.AccessController.checkPermission(Unknown Source)
       at java.lang.SecurityManager.checkPermission(Unknown Source)
       at java.lang.SecurityManager.checkPropertiesAccess(Unknown Source)
       at java.lang.System.getProperties(Unknown Source)
       at com.sun.j3d.utils.applet.MainFrame.build(Unknown Source)
       at com.sun.j3d.utils.applet.MainFrame.<init>(Unknown Source)
       at OSESKeyNav.init(OSESKeyNav.java:186)//-------------------------new
MainFrame(applet, WINDOW_WIDTH, WINDOW_HEIGHT);
       at sun.applet.AppletPanel.run(Unknown Source)
       at java.lang.Thread.run(Unknown Source)

I don't know where is the problem.
I tried to use a JPanel instead of MainFrame: the errors disappears but I
don't see the canvas3d.
Please help me!:)

Thanks to all!
(sorry for my bad english)