code: @Override
      public Integer getInteger(String key) {
          Integer r = super.getInteger(key);
          if (r == null) {
              LOGGER.error(ERROR_NOSUCHKEY + key + "\"");
              return null;
          }
          return r;
      }
docs: Get a property as Integer or null if not there / or if the property is not an integer.
  
  @param key the key
  @return the property or {@literal null} if not there or property no integer