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Inconsistent FileNotFoundException

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I have a web server and a client applet to have chat functionality between server and client. If I run the applet on a different machine other than where the server is, it works just fine.
But if I try to run the applet from the same machine ie., http:\\localhost ort\chat.html, then applet fails to load and I get a series of for many of the library jar files.
Not only that, it has so many inconsistent behavior in different machines (but atleast it gets loaded in all those machines). BTW, its a signed applet.
I am really confused about this behavior of my applet... it will be really helpful if somebody can help me out in solving this problem.
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My guess is you're using pathname-based URLs for your files rather than classpath-based ones.
For example, instead of:
InputStream s = Something.openStream("file name here");
you should use:
URL resource = getClass().getResource("file name here");
InputStream s = Something.openStream(resource);
Don't get me started about those stupid light bulbs.
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