code: @Override
  	public void service(final ServletRequest req, final ServletResponse res)
  			throws ServletException, IOException {
  		if (jspFile != null) {
  			req.setAttribute(RequestDispatcher.INCLUDE_SERVLET_PATH, jspFile);
  		}
  		String includeRequestUri = (String) req
  				.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI);
  
  		if (includeRequestUri != null) {
  			req.removeAttribute(RequestDispatcher.INCLUDE_REQUEST_URI);
  		}
  
  		try {
  			ContextClassLoaderUtils.doWithClassLoader(jasperClassLoader,
  					new Callable<Void>() {
  
  						@Override
  						public Void call() throws Exception {
  							jasperServlet.service(req, res);
  							return null;
  						}
  
  					});
  		} catch (ServletException | IOException e) {
  			// re-thrown
  			throw e;
  		} catch (Exception ignore) {
  			// ignored as it should never happen
  			LOG.error("Ignored exception", ignore);
  		}
  		//CHECKSTYLE:ON
  	}
docs: Delegates to jasper servlet with a controlled context class loader.
  
  @see JspServlet#service(ServletRequest, ServletResponse)