struts1.29验证框架validate的问题

一个很简单的练习，动态ActionForm，用validate验证用户明和密码,校验器required,minlength。表现:提交后不较验，直接跳到目标action.do，不知道我那个地方做的有问题，请。系统没有任何误提示，配置relation.xml为:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE form-validation PUBLIC
          "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"
          "http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
       
<form-validation>
	<formset>
		<form name="validateForm">
			<field property="userName" depends="required,minlength">
				<msg name="required" key="姓名不能为空" resource="false"/>
				<msg name="minlength" key="姓名格式不对" resource="false"/>
				<var>
					<var-name>minlength</var-name>
					<var-value>3</var-value>
				</var>
			</field>
		</form>
	</formset>
</form-validation>

请高物过目(form用的是DynaValidatorActionForm)