code: public void init(final FilterConfig filterConfig) {
  
          final String denyParam = filterConfig.getInitParameter("denyUrls");
          if (StringUtils.isNotBlank(denyParam)) {
              this.denyUrls = denyParam.split(",");
          }
  
          final String ignoreParam = filterConfig.getInitParameter("ignoreUrls");
          if (StringUtils.isNotBlank(ignoreParam)) {
              this.ignoreUrls = ignoreParam.split(",");
          }
  
      }
docs: Initialize "deny" parameter from web.xml.
  
  @param filterConfig A filter configuration object used by a servlet container
  to pass information to a filter during initialization.