code: public Configuration unmarshall(InputStream inputStream) {
          try {
              final Unmarshaller unmarshaller = _jaxbContext.createUnmarshaller();
              unmarshaller.setEventHandler(new JaxbValidationEventHandler());
  
              final Configuration configuration = (Configuration) unmarshaller.unmarshal(inputStream);
              return configuration;
          } catch (JAXBException e) {
              throw new IllegalStateException(e);
          }
      }
docs: Convenience method to get the untouched JAXB configuration object from an
  inputstream.
  
  @param inputStream
  @return