public void validate(FacesContext context, UIComponent component, Object nome) throws ValidatorException

<?xml version="1.0" encoding="UTF-8"?>
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xi="http://www.w3.org/2001/XInclude"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
  <managed-bean>
    <managed-bean-name>htmlBean</managed-bean-name>
    <managed-bean-class>
      it.html.jsf.bean.HtmlBean
    </managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
  </managed-bean>
  <navigation-rule>
    <from-view-id>/index.jsp</from-view-id>
    <navigation-case>
      <from-outcome>risultato</from-outcome>
      <to-view-id>/risultato.jsp</to-view-id>
    </navigation-case>
  </navigation-rule>
  <validator>
    <validator-id>htmlValidator</validator-id>
    <validator-class>
      it.html.jsf.validator.HtmlValidator
    </validator-class>
  </validator>
</faces-config>