服务器端applet用jmf播放声音文件出错

一个applet例子程序，使用JMF来放语音。
我用Jbuildx在windows xp上编译通过，并可以成功放音。把class/html/wav文件放在web服务器(linux上)上，再在windows Xp上用appletviewer运行出错，客户端在安装jmf4windows的程序前后现象相同。
在windows/linux(web服务器)两个环境下，同一目录下均有class/html/wav三个文件，分别为：SimplePlayerApplet.class/spa.html/test.wav,
Java文件SimplePlayerApplet.java如下：

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import java.util.Properties;
import javax.media.*;
//import com.sun.media.util.JMFSecurity;

/**
* This is a Java Applet that demonstrates how to create a simple
* media player with a media event listener. It will play the
* media clip right away and continuously loop.
*
* <!-- Sample HTML
* <applet code=SimplePlayerApplet width=320 height=300>
* <param name=file value="sun.avi">
* </applet>
* -->
*/
public class SimplePlayerApplet extends Applet implements ControllerListener {

// media Player
Player player = null;
// component in which video is playing
Component visualComponent = null;
// controls gain, position, start, stop
Component controlComponent = null;
// displays progress during download
Component progressBar = null;
boolean firstTime = true;
long CachingSize = 0L;
Panel panel = null;
int controlPanelHeight = 0;
int videoWidth = 0;
int videoHeight = 0;

/**
* Read the applet file parameter and create the media
* player.
*/
public void init() {
//$ System.out.println("Applet.init() is called");
setLayout(null);
setBackground(Color.white);
panel = new Panel();
panel.setLayout( null );
add(panel);
panel.setBounds(0, 0, 320, 240);

// input file name from html param
String mediaFile = null;
// URL for our media file
MediaLocator mrl = null;
URL url = null;

// Get the media filename info.
// The applet tag should contain the path to the
// source media file, relative to the html page.

if ((mediaFile = getParameter("FILE")) == null)
Fatal("Invalid media file parameter");

try {
url = new URL(getDocumentBase(), mediaFile);
mediaFile = url.toExternalForm();
} catch (MalformedURLException mue) {
}

try {
// Create a media locator from the file name
if ((mrl = new MediaLocator(mediaFile)) == null)
Fatal("Can't build URL for " + mediaFile);

/*
try {
JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager,
JMFSecurity.writePropArgs);
JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager,
JMFSecurity.readPropArgs);
JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager,
JMFSecurity.connectArgs);
} catch (Exception e) {}
*/

// Create an instance of a player for this media
try {
player = Manager.createPlayer(mrl);
} catch (NoPlayerException e) {
System.out.println(e);
Fatal("Could not create player for " + mrl);
}

// Add ourselves as a listener for a player's events
player.addControllerListener(this);

} catch (MalformedURLException e) {
Fatal("Invalid media file URL!");
} catch (IOException e) {
Fatal("IO exception creating player for " + mrl);
}

// This applet assumes that its start() calls
// player.start(). This causes the player to become
// realized. Once realized, the applet will get
// the visual and control panel components and add
// them to the Applet. These components are not added
// during init() because they are long operations that
// would make us appear unresposive to the user.
}