code: @Override
      public void loadProperties(String restClientName){
          enableDynamicProperties = true;
          setClientName(restClientName);
          loadDefaultValues();
          Configuration props = ConfigurationManager.getConfigInstance().subset(restClientName);
          for (Iterator<String> keys = props.getKeys(); keys.hasNext(); ){
              String key = keys.next();
              String prop = key;
              try {
                  if (prop.startsWith(getNameSpace())){
                      prop = prop.substring(getNameSpace().length() + 1);
                  }
                  setPropertyInternal(prop, getStringValue(props, key));
              } catch (Exception ex) {
                  throw new RuntimeException(String.format("Property %s is invalid", prop));
              }
          }
      }
docs: Load properties for a given client. It first loads the default values for all properties,
  and any properties already defined with Archaius ConfigurationManager.