Struts2类型转换错误消息的显示

1 <s:form action="conversionAction" namespace="/">
2         Age:<s:textfield name="age"></s:textfield>
3         <br/>
4         <s:submit></s:submit>
5 </s:form>

public conversionAction extends ActionSupport {
    private int age;
    public void setAge(int age) {
        this.age = age;
    }
    public int getAge() {
        return age;
    }
}

 <action name="conversionAction" class="com.fanfan.convert.ConversionAction">
            <result>
            /convert-success.jsp
            </result>
            <result name="input">/convert.jsp</result><!-- 配置name为input的result 转换出错时跳转到该页面 -->
        </action>