Struts 2 Validation - No client e server é possível?

public String incluir() {
        try {
            if (verificarDadosIncluir()) {
                return SOLICITAR_INCLUSAO;
            }
            // ..... fazendo a inclusão
            return execute();
        } catch (MinhaException ex) {
            // ............ Tratamento da exceção
            addActionError("Erro");
            return SOLICITAR_INCLUSAO;
        }
    }

    private boolean verificarDadosIncluir() {
        boolean hasError = false;
        if (usuario != null && (usuario.getNome() == null
                || usuario.getNome().equals(""))) {
            hasError = true;
            addFieldError("nome", getText("view.nome.requerido"));
        }
        if (usuario != null && (usuario.getLogin() == null
                || usuario.getLogin().equals(""))) {
            hasError = true;
            addFieldError("login", getText("view.login.requerido"));
        }
        return hasError;
    }

<s:form action="Usuario!pesquisar" validate="true">
      <s:textfield label="%{getText('view.usuario.nome')}" name="nome"/>
      <s:textfield label="%{getText('view.usuario.login')}" name="login" />
      <s:select list="perfis" label="%{getText('view.usuario.perfil')}"
                    listKey="id" listValue="nome" name="perfil.id"
                    headerKey="0" headerValue=" -- Selecionar -- " />
      <s:submit key="view.button.usuario.pesquisar" />
      <s:submit key="view.button.usuario.incluir" action="Usuario!solicitarInclusao" />
</s:form>

/**
 * AgendaAction extends ActionSupport.
 */
public class UsuarioAction extends AgendaAction {

    private List<Usuario> usuarios;
    private List<Perfil> perfis;
    private Usuario usuario;

    public String pesquisar() throws Exception {
        logger.info("pesquisar()");
        List<Usuario> lista = getAgenda().pesquisar(getLogin(), getNome(), getPerfil());
        setUsuarios(lista);
        setPerfis(getAgenda().listarPerfis());
        setUsuario(null);
        return SUCCESS;
    }

    public String getNome() {
        if (usuario != null) {
            return usuario.getNome();
        }
        return null;
    }

    public void setNome(String nome) {
        if (usuario == null) {
            usuario = new Usuario();
        }
        usuario.setNome(nome);
    }

    // Restante dos métodos, seguem o mesmo padrão do getNome e setNome.

}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" extends="struts-default">

        <action name="Logon!*" method="{1}" class="cc.co.taciano.agenda2.actions.LogonAction">
            <result name="success">/paginas/home.jsp</result>
            <result name="input">/paginas/logon.jsp</result>
        </action>

        <action name="Home" class="cc.co.taciano.agenda2.actions.AgendaAction">
            <result>/paginas/home.jsp</result>
        </action>

        <action name="Usuario!*" method="{1}" class="cc.co.taciano.agenda2.actions.UsuarioAction">
            <result>/paginas/usuario/listar.jsp</result>
            <result name="solicitarInclusao">/paginas/usuario/incluir.jsp</result>
            <result name="solicitarAlteracao">/paginas/usuario/alterar.jsp</result>
        </action>

        <action name="Contato" class="cc.co.taciano.agenda2.actions.ContatoAction">
            <result>/paginas/contato/listar.jsp</result>
        </action>

    </package>
</struts>

<!DOCTYPE validators PUBLIC
"-//OpenSymphony Group//XWork Validator 1.0.2//EN"
"http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
    <field name="login">
        <field-validator type="requiredstring">
            <message key="loginrequerido"/>
        </field-validator>
    </field>
</validators>

<script type="text/javascript">
    function validateForm_Logon() {
        form = document.getElementById("Logon");
        clearErrorMessages(form);
        clearErrorLabels(form);

        var errors = false;
        // field name: username
        // validator name: requiredstring
        if (form.elements['username']) {
            field = form.elements['username'];
            var error = "Login Requerido!";
            if (field.value != null && (field.value == "" || field.value.replace(/^\s+|\s+$/g,"").length == 0)) {
                addError(field, error);
                errors = true;
            }
        }
        // field name: password
        // validator name: requiredstring
        if (form.elements['password']) {
            field = form.elements['password'];
            var error = "Senha Requerida!";
            if (field.value != null && (field.value == "" || field.value.replace(/^\s+|\s+$/g,"").length == 0)) {
                addError(field, error);
                errors = true;
            }
        }

        return !errors;
    }
</script>

<script type="text/javascript">
    function validateForm_Usuario() {
        form = document.getElementById("Usuario");
        clearErrorMessages(form);
        clearErrorLabels(form);

        var errors = false;

        return !errors;
    }
</script>