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Check whether you have valid class patht to that particular jar file..
That probably means the class file is corrupted. Did you happen to use a Reader or a Writer when you were extracting it from the zip file? If so, don't. Those things will mangle binary data because they assume it's text. Use InputStream and OutputStream instead.
Did you touch the ZipEntry read ... The "bad magic number" of the error messages rings me a bell.
Sorry for this short answer, but hope it can help .