We can setup a method that we can use to load the XSLT:

<%!
   File transformFile;
   
   public void jspInit() {
      ServletConfig config = getServletConfig();
      transformFile = new File(config.getServletContext().getRealPath("service.xsl"));
   }

   public Transformer loadTransformer() {
      ServletConfig config = getServletConfig();
      try {
         TransformerFactory tfactory = TransformerFactory.newInstance();
         return tfactory.newTransformer(new StreamSource(transformFile));
      } catch (Exception ex) {
         config.getServletContext().log("Cannot load stylesheet.",ex);
      }
      return null;
   }
%>