about applet used in servlet

?????? <[email protected]>
Newsgroups gmane.comp.java.sun.servlet,gmane.spam.detected
Message-ID <[email protected]>
I donot know where to find that how applet was used in servlet, the problem is that I use an applet in servlet, it can be used in other computer, but in mine it cannot work.
when i open the servlet page first it ask to download, but after download it can not work. other page use applet(same version) show error:java.lang.NoSuchMethodError:java.net.URL:Method getPath()Ljava/lang/String;not found
What should I do?
the applet can  show menu, and it should interact with servlet!
Who can tell me !
ergency!
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