docs: public String getString(String key, String defaultValue)
      {
          String ret = properties.getProperty(key);
          if (ret == null)
          {
              if(defaultValue == null)
              {
                  logger.info("No value for key '" + key + "'");
              }
              else
              {
                  logger.debug("No value for key \"" + key + "\", using default \""
                          + defaultValue + "\".");
                  properties.put(key, defaultValue);
              }
  
              ret = defaultValue;
          }
  
          return ret;
      }