code: public static AspectranWebService create(ServletContext servletContext) {
          String aspectranConfigParam = servletContext.getInitParameter(ASPECTRAN_CONFIG_PARAM);
          if (aspectranConfigParam == null) {
              log.warn("No specified servlet context initialization parameter for instantiating WebService");
          }
  
          AspectranWebService service = create(servletContext, aspectranConfigParam);
          servletContext.setAttribute(ROOT_WEB_SERVICE_ATTRIBUTE, service);
  
          if (log.isDebugEnabled()) {
              log.debug("The Root WebService attribute in ServletContext has been created; " +
                      ROOT_WEB_SERVICE_ATTRIBUTE + ": " + service);
          }
  
          return service;
      }
docs: Returns a new instance of {@code AspectranWebService}.
  
  @param servletContext the servlet context
  @return the instance of {@code AspectranWebService}