validacão com webwork

<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.dtd">
<validators>
    <field name="name">
        <field-validator type="requiredstring">
            <message>O campo Nome é de preenchimento obrigatório !</message>
        </field-validator>
    </field>
    <field name="age">
        <field-validator type="requiredstring">
            <message>O campo idade é de preenchimento obrigatório !</message>
        </field-validator>
    </field>
</validators>

package ww;

import com.opensymphony.xwork.ActionSupport;
import com.opensymphony.xwork.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven{
          
    private UserVO user;
    
    public String execute() throws Exception 
    {
        String teste = "bla bla bla...";
        return SUCCESS; 
    }
       
    public Object getModel() {
       return user;
    }

}

<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.0//EN" "http://www.opensymphony.com/xwork/xwork-1.0.dtd">

<xwork>

	<include file="webwork-default.xml" />
	<package name="default" extends="webwork-default">			
	<action name="User" class="ww.UserAction">
            <interceptor-ref name="validationWorkflowStack"/>

            <result name="success" type="dispatcher">resultado.vm</result>
            <result name="input" type="dispatcher">index.vm</result>
            <result name="error" type="dispatcher">index.vm</result>
        </action>	
	</package>

</xwork>