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I got this error, so of course, I looked around for this jar.  Couldn't find any.  Then I just did a dump from the xfire/lib distribution direction into my project, and the error went away.
I tried to do an import of "com.bea.xml.stream.MXParserFactory' in a java file, and guess what!  The class was still not in my classpath.  I guess when you see this error, it means "some parser" did not get resolved in your classpath and we tried using "com.bea.xml.stream.MXParserFactory' as a last resort.