IIRC the interfaces such as XSLTProcessor, XSLTProcessorFactory and XSLTInputSource were in Xalan 1, and were superseded by JAXP interfaces years ago. I suggest you use the latest version of everything and upgrade your application to use the new interfaces.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference