code: public String getConfigFolder() {
  
          // check if the system property is set and return its value
          if (CmsStringUtil.isNotEmpty(System.getProperty(CONFIG_FOLDER_PROPERTY))) {
              return System.getProperty(CONFIG_FOLDER_PROPERTY);
          } else {
              return getAbsoluteRfsPathRelativeToWebInf(FOLDER_CONFIG_DEFAULT);
          }
      }
docs: Gets the path of the opencms config folder.<p>
  Per default this is the "/WEB-INF/config/ folder.
  If configured with the "-Dopencms.config=..." java startup parameter, OpenCms can access an external config
  folder outside its webapplication.
  @return complete rfs path to the config folder.