branch_for_jsf_2_0/examples/hello_bean-validation/src/main/webapp/pages/groupValidation01.xhtml

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<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                template="/layout/template.xhtml">
    <ui:define name="title">Hello World</ui:define>
    <ui:define name="content">
          <h:panelGrid columns="3">
            <h:outputLabel for="first_name" value="First name*:"/>
            <h:inputText id="first_name" label="First name" value="#{helloGroupValidationController['person'].firstName}"/>
            <h:message for="first_name" showSummary="true" showDetail="false" errorStyle="color: red;" warnStyle="color: orange;"/>

            <h:outputLabel for="last_name" value="Last name**:"/>
            <h:inputText id="last_name" label="Last name" value="#{helloGroupValidationController.person.lastName}"/>
            <h:message for="last_name" showSummary="true" showDetail="false" errorStyle="color: red;" warnStyle="color: orange;"/>

            <h:commandButton value="Press me" action="#{helloGroupValidationController.send}"/>
            <f:verbatim/>
            <f:verbatim/>
          </h:panelGrid>
        <h:messages globalOnly="true" showDetail="true" showSummary="false"/>

    </ui:define>
</ui:composition>