public final T fromXmlObject(V xmlObject) {
    if (xmlObject == null) {
      return null;
    }
    return fromNonNullXmlObject(xmlObject);
  }
the implementer of each pair of configuration object and xml domain object is
reponsible in converting between the two

@param <T> the class of the configuration object
@param <V> the class of the xml domain object
geode-core/src/main/java/org/apache/geode/management/internal/configuration/converters/ConfigurationConverter.java