code: public static synchronized DocumentBuilder createDocumentBuilder() {
          DocumentBuilder result;
          try {
              result = FACTORY_NON_VALIDATING.newDocumentBuilder();
          } catch (ParserConfigurationException e) {
              throw new RuntimeException("createDocumentBuilder failed", e);
          }
          result.setErrorHandler(ERROR_HANDLER);
          return result;
      }
docs: -- document builder