Security.PrivilegedActionException:

Question

Hello,
I made an applet which runs ok in local mode, but when I upload it on my server it doesn't work.
myapplet is not made for read or write files, it's just sound cosmetics and I did not sign it (would that solve my problem? I don't think so, correct me if I'm wrong). Probably it's something in my code (I'm autodidapt and beguinner), can you help me to understand what's wrong with it? Ah, stopSound() and playSound() functions are called from javascript.
thank you very very much
a.
java.security.PrivilegedActionException: java.lang.reflect.InvocationTargetException
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin.liveconnect.SecureInvocation$2.run(SecureInvocation.java:215)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin.liveconnect.SecureInvocation.CallMethod(SecureInvocation.java:193)
     at sun.plugin.liveconnect.SecureInvocation.access$300(SecureInvocation.java:52)
     at sun.plugin.liveconnect.SecureInvocation$CallMethodThread.run(SecureInvocation.java:124)
Caused by: java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at sun.plugin.javascript.invoke.JSInvoke.invoke(JSInvoke.java:19)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at sun.plugin.javascript.JSClassLoader.invoke(JSClassLoader.java:44)
     at sun.plugin.liveconnect.PrivilegedCallMethodAction.run(SecureInvocation.java:638)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThread)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:264)
     at java.security.AccessController.checkPermission(AccessController.java:427)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at sun.applet.AppletSecurity.checkAccess(AppletSecurity.java:211)
     at java.lang.Thread.checkAccess(Thread.java:1236)
     at java.lang.Thread.interrupt(Thread.java:821)
     at FadesApplet440.stopSound(FadesApplet440.java:104)
     ... 17 more
public class myapplet extends Applet     
     SingleTrack                    Thread1;
     SingleTrack                    Thread2;
     boolean                         go = false;
     public static void main(String args[])
          myapplet applet = new myapplet();
          AppletFrame frame = new AppletFrame("myapplet", applet);
          frame.resize(100,70);
          frame.show();
          frame.test();     
     SingleTrack makeThread()
          return new SingleTrack();
     public void playSound()
          Thread1 = makeThread();
          Thread2 = makeThread();
          Thread1.start();
          Thread2.start();
     public void stopSound()
          Thread1.fadeOut();
          this.Thread1.interrupt();
          Thread2.fadeOut();
          this.Thread2.interrupt();
     class SingleTrack extends Thread
          public SingleTrack()
               //...objects and setup
          public void run()
               try
                    while(go)
                         //..do the thing
               catch( SynthException e )
                    System.err.println("run() interruption: " + e);
          public void fadeOut()
               //..fade and end
               go = false;
}

Answer 1

solved. It was a simple error in my code: the boolean go cannot be changed from the child thread, that's why it returned the modifyThread error.