SecureCallbackHandler(AccessControlContext acc,
    CallbackHandler ch) 
{
            this.acc = acc;
            this.ch = ch;
}

 public  void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException 
{
            try {
                java.security.AccessController.doPrivileged
                    (new java.security.PrivilegedExceptionAction< Void >() {
                    public Void run() throws java.io.IOException,
                                        UnsupportedCallbackException {
                        ch.handle(callbacks);
                        return null;
                    }
                }, acc);
            } catch (java.security.PrivilegedActionException pae) {
                if (pae.getException() instanceof java.io.IOException) {
                    throw (java.io.IOException)pae.getException();
                } else {
                    throw (UnsupportedCallbackException)pae.getException();
                }
            }
}