Add a child UISelectItems component to the UIComponent associated with the closed parent UIComponent custom action. When iterating over the select items. This f: selectItems Facelet lets developers to add a Collection, Map or an array of SelectItem to have more programmatic control over the generated items. The member elements may be instances of SelectItem or any Java Object. In the case where the member elements are plain Java Objects, several additional.
Jsf selectitems Video