ValidatorResources not found in application scope under key "org.apache.commons.validator.VALIDATOR_RESOURCES"

ValidatorResources not found in application scope under key "org.apache.commons.validator.VALIDATOR_RESOURCES"jsp中的代码；=================================
<!-- 自动生成javascript校验 -->
    <html:javascript formName="logonForm" dynamicJavascript="true" staticJavascript="fasle"/>
    <script type="text/javascript" src="staticJavascript.jsp"></script>====
<!-- Validation.xml配置-->=============================
               <form name="logonForm">
<!-- 校验用户名 -->
<field property="username" depends="required, minlength, maxlength">
<arg0 key="prompt.username"/>
<arg1 key="${var:minlength}" name="minlength" resource="false"/>
<arg2 key="${var:maxlength}" name="maxlength" resource="false"/>
<var>
<var-name>maxlength</var-name>
<var-value>16</var-value>
</var>
<var>
<var-name>minlength</var-name>
<var-value>3</var-value>
</var>
</field>
<!-- 校验密码 -->
<field property="password" depends="required, minlength, maxlength">
<arg0 key="prompt.password"/>
<arg1 key="${var:minlength}" name="minlength" resource="false"/>
<arg2 key="${var:maxlength}" name="maxlength" resource="false"/>
<var>
<var-name>maxlength</var-name>
<var-value>16</var-value>
</var>
<var>
<var-name>minlength</var-name>
<var-value>3</var-value>
</var>
</field>
</form>
ActionForm配置=======================
               <form-bean name="logonForm"
type="org.apache.struts.validator.DynaValidatorForm">
<form-property name="username" type="java.lang.String" />
<form-property name="password" type="java.lang.String" />
</form-bean>