code: @JSFProperty(defaultValue = "false")
      public boolean isRequired()
      {
          return (Boolean) getStateHelper().eval(PropertyKeys.required, Boolean.FALSE);
      }
docs: A boolean value that indicates whether an input value is required.
  <p>
  If this value is true and no input value is provided by a postback operation, then the "requiredMessage" text is
  registered as a FacesMessage for the request, and validation fails.
  </p>
  <p>
  Default value: false.
  </p>