title: XSLT- Refer to java custom method
body: <p>I am quite new to XSLT and quite confused on how to use java inside XSLT.
  I have an XSL template that will transform one XML to another. My requirement is to access an external java class method in my XSLT. 
  I have a java class called FileCopy and its method is copyFile().
  I need a way to access the copyFile() method inside my XSLT.</p>