code: @Override
      protected Validator createValidator() throws JspException
      {
          if (null == _minimum && null == _maximum)
          {
              throw new JspException("a minimum and / or a maximum have to be specified");
          }
          ELContext elContext = FacesContext.getCurrentInstance().getELContext();
          if (null != _minimum)
          {
              _min = getValue(_minimum.getValue(elContext));
          }
          if (null != _maximum)
          {
              _max = getValue(_maximum.getValue(elContext));
          }
          if (null != _minimum && null != _maximum)
          {
              if (!isMinLTMax())
              {
                  throw new JspException("maximum limit must be greater than the minimum limit");
              }
          }
          return super.createValidator();
      }
docs: This method returns the Validator, you have to cast it to the correct type and apply the min and max values.
  
  @return
  @throws JspException