code: public void doFilter(ServletRequest servReq, ServletResponse servRes, FilterChain chain) throws IOException, ServletException {
          final HttpServletRequest request = (HttpServletRequest) servReq;
          final HttpServletResponse response = (HttpServletResponse) servRes;
          resolveCharacterEncoding(request);
          viaLastaDiContext(request, response, chain); // #to_action
      }
docs: ==========