Struts2日期类型转换问题？？？

我在jsp文本框中输入日期格式的数据，在Action中使用Date类型接收时报错，如果不输入日期（使日期为空）或在Action中使用String类型来接收就不会报错，这是为什么？？？错误提示是找不到返回结果，这个错误和日期字段有关系吗，难道只是配置文件写错了？？？如果和日期类型转换有关系应该怎么改？？？

错误：
11:44:40,640 ERROR Dispatcher:515 - Could not find action or result
No result defined for action www.account.people.struts.TestAction and result input - action - file:/E:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/account/WEB-INF/classes/config/struts/people/people-struts.xml:23:56
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:345)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48) ....

代码如下：

jsp代码：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Insert title here </title>
</head>
<body>
<form action=" <%=request.getContextPath()%>/test/toGo.shtml" method="post">
str: <input type="text" name="str" id = "str">
time: <input type="text" name="timee" id="timee">
<input type="submit" value="提交">
</form> </body>
</html>

Action代码：
public class TestAction extends BaseAction {

private Date timee;
private String str;
private String times;

public String toGo(){
System.out.println(times);
return super.SUCCESS;
}
public String getStr() {
return str;
}

public void setStr(String str) {
this.str = str;
}

public Date getTimee() {
return timee;
}

public void setTimee(Date timee) {
this.timee = timee;
}

public String getTimes() {
return times;
}

public void setTimes(String times) {
this.times = times;
}
}

struts2配置文件：
<package name="test" namespace="/test" extends="struts-default">
<action name="toGo" class="testAction" method="toGo">

<result name="success">/index.jsp </result>
</action>
</package>

补充：
1.我后来把jsp使用struts2的标签重新写了一边，日期也使用了struts2的日期控件，提交后还是报同样的错误。。
2.按网上的一些说法我也添加了Date类型转换类，xwork-conversion.properties配置也加上了，还是同样的错误。。