docs: public int getIntProp(Prop.Names prop) throws CommandExecutionException {
          String value = getSingleProp(prop);
          if (value.equals("")) throw new CommandExecutionException(CommandExecutionException.Error.INVALID_RESPONSE);
          try {
              return Integer.valueOf(value);
          } catch (Exception e){
              throw new CommandExecutionException(CommandExecutionException.Error.INVALID_RESPONSE);
          }
      }