求助:     Applet无法在客户端   已经安装了JVM浏览器上运行

服务器:   win2000,   web服务器:   tomcat5.0
 
  jdk:   1.4   客户端jre1.4

  html调用applet代码:  
  <applet   align=middle   code= "applet.class "   codebase= ". "   width=450   height=400>
</applet>

  类文件和html文件都放在同一目录下       webapps\Applet

  在服务器浏览器中输入:     http://192.168.4.248:8080/Applet/applet.html   能正常显示applet
   
  但在客户机上输入http://192.168.4.248:8080/Applet/applet.html时控制台报错如下,请问是为什么?  

Java(TM)   Plug-in:   版本   1.4.2_10
使用   JRE   版本   1.4.2_10   Java   HotSpot(TM)   Client   VM
用户主目录   =   C:\Documents   and   Settings\whq代理配置：没有代理----------------------------------------------------
c:       清除控制台窗口
f:       终结在结束队列上的物件
g:       垃圾收集
h:       显示此帮助消息
l:       转储类载入程序列表
m:       打印内存使用
o:       触发日志记录
p:       重新载入代理配置
q:       隐藏控制台
r:       重新载入策略配置
s:       转储系统属性
t:       转储线程列表
v:       转储线程堆栈
x:       清除类载入程序高速缓存
0-5:   设置跟踪级别为 <n>
----------------------------------------------------
java.lang.NullPointerException at   sun.plugin.cache.CachedFileLoader.writeHeaders(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.createCacheFiles(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.access$200(Unknown   Source) at   sun.plugin.cache.CachedFileLoader$3.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.plugin.cache.CachedFileLoader.download(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.load(Unknown   Source) at   sun.plugin.cache.FileCache.get(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connectWithCache(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getHeaderField(Unknown   Source) at   java.net.HttpURLConnection.getResponseCode(Unknown   Source) at   sun.applet.AppletClassLoader.getBytes(Unknown   Source) at   sun.applet.AppletClassLoader.access$100(Unknown   Source) at   sun.applet.AppletClassLoader$1.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.applet.AppletClassLoader.findClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadCode(Unknown   Source) at   sun.applet.AppletPanel.createApplet(Unknown   Source) at   sun.plugin.AppletViewer.createApplet(Unknown   Source) at   sun.applet.AppletPanel.runLoader(Unknown   Source) at   sun.applet.AppletPanel.run(Unknown   Source) at   java.lang.Thread.run(Unknown   Source)java.lang.NullPointerException at   sun.plugin.cache.CachedFileLoader.writeHeaders(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.createCacheFiles(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.access$200(Unknown   Source) at   sun.plugin.cache.CachedFileLoader$3.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.plugin.cache.CachedFileLoader.download(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.load(Unknown   Source) at   sun.plugin.cache.FileCache.get(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connectWithCache(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getHeaderField(Unknown   Source) at   java.net.HttpURLConnection.getResponseCode(Unknown   Source) at   sun.applet.AppletClassLoader.getBytes(Unknown   Source) at   sun.applet.AppletClassLoader.access$100(Unknown   Source) at   sun.applet.AppletClassLoader$1.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.applet.AppletClassLoader.findClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadCode(Unknown   Source) at   sun.applet.AppletPanel.createApplet(Unknown   Source) at   sun.plugin.AppletViewer.createApplet(Unknown   Source) at   sun.applet.AppletPanel.runLoader(Unknown   Source) at   sun.applet.AppletPanel.run(Unknown   Source) at   java.lang.Thread.run(Unknown   Source)java.lang.NullPointerException at   sun.plugin.cache.CachedFileLoader.writeHeaders(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.createCacheFiles(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.access$200(Unknown   Source) at   sun.plugin.cache.CachedFileLoader$3.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.plugin.cache.CachedFileLoader.download(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.load(Unknown   Source) at   sun.plugin.cache.FileCache.get(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connectWithCache(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getHeaderField(Unknown   Source) at   java.net.HttpURLConnection.getResponseCode(Unknown   Source) at   sun.applet.AppletClassLoader.getBytes(Unknown   Source) at   sun.applet.AppletClassLoader.access$100(Unknown   Source) at   sun.applet.AppletClassLoader$1.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.applet.AppletClassLoader.findClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadCode(Unknown   Source) at   sun.applet.AppletPanel.createApplet(Unknown   Source) at   sun.plugin.AppletViewer.createApplet(Unknown   Source) at   sun.applet.AppletPanel.runLoader(Unknown   Source) at   sun.applet.AppletPanel.run(Unknown   Source) at   java.lang.Thread.run(Unknown   Source)java.lang.NullPointerException at   sun.plugin.cache.CachedFileLoader.writeHeaders(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.createCacheFiles(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.access$200(Unknown   Source) at   sun.plugin.cache.CachedFileLoader$3.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.plugin.cache.CachedFileLoader.download(Unknown   Source) at   sun.plugin.cache.CachedFileLoader.load(Unknown   Source) at   sun.plugin.cache.FileCache.get(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connectWithCache(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown   Source) at   sun.plugin.net.protocol.http.HttpURLConnection.getHeaderField(Unknown   Source) at   java.net.HttpURLConnection.getResponseCode(Unknown   Source) at   sun.applet.AppletClassLoader.getBytes(Unknown   Source) at   sun.applet.AppletClassLoader.access$100(Unknown   Source) at   sun.applet.AppletClassLoader$1.run(Unknown   Source) at   java.security.AccessController.doPrivileged(Native   Method) at   sun.applet.AppletClassLoader.findClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadClass(Unknown   Source) at   java.lang.ClassLoader.loadClass(Unknown   Source) at   sun.applet.AppletClassLoader.loadCode(Unknown   Source) at   sun.applet.AppletPanel.createApplet(Unknown   Source) at   sun.plugin.AppletViewer.createApplet(Unknown   Source) at   sun.applet.AppletPanel.runLoader(Unknown   Source) at   sun.applet.AppletPanel.run(Unknown   Source) at   java.lang.Thread.run(Unknown   Source)

着急啊

高手指点一下啊

是不是引用的其他包的类而没有把那个包打包进去