Java SE (Java Platform, Standard Edition)

Hi,

I have an applet embedded in a remote-server page. It can be loading from the server and running in the local computer with Jre1.3.1. After I uninstalled jre1.3.1 and installed JRE1.4.1_01. My applet doesn't run. Here is the message from Java Consol:

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.Cache.privileged(Unknown Source)
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.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:1197)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:247)
at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:250)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:42)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:143)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:140)
at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:114)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:501)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:566)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:495)
at sun.applet.AppletPanel.run(AppletPanel.java:292)
at java.lang.Thread.run(Thread.java:536)

I copy the my html file which has this applet built-in to my local computer. The webpage can be openned and the applet running fine even with jre1.4.1. Why it didn't run with Jre1.4.1 and it did run with jre 1.3.1 when loading remotely? Could someone tell me what the above messages mean? Is this a bug from Jre1.4.1_01?

Thanks,

Kunlun