让人很郁闷的No result defined for action 错误。。。望牛人解答！！！！！！

小弟使用是struts2.0   spring2.0  hibernate框架   
在跳转action时控制台页面报错：
2008-10-12 15:35:36,987 INFO [com.opensymphony.xwork2.validator.ActionValidatorManagerFactory] - <Detected AnnotationActionValidatorManager, initializing it...>
2008-10-12 15:35:37,549 ERROR [org.apache.struts2.dispatcher.Dispatcher] - <Could not find action or result>
No result defined for action com.hy.action.InvestAction and result input - action - file:/D:/tomcat/Tomcat%205.5/webapps/PMS_SSH_2008_10_06/WEB-INF/classes/struts.xml:15:54
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)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
                                                         ........
jsp页面代码</head><body>
    <form id="investform" action="invest!investSave.action" method="post">
  <table width="100%"  border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td class="page-positon-td">xxxxx</td>
    </tr>
    <tr>
      <td class="boxoff_td">
        <table cellpadding="0" cellspacing="0" class="table-lt-border">
        <tr>
          <td class="list-header-td">xxxxxx<input type="button" class="btn-7word" value="项目信息及专业" onclick="showDiv()">
          </td>
        </tr>
        <td>
        <table>
        <tr>
          <td width="200" class="list-left-title">年份</td>
          <td width="200" class="info-left-td">
           <select id="year" name="txplaninfo.year">
           <option>年份</option>
           <option value="2005">2005</option>
           <option value="2006">2006</option>
           <option value="2007">2007</option>
           <option value="2008">2008</option>
           <option value="2009">2009</option>
           <option value="2010">2010</option>
           <option value="2011">2011</option>
           </select></td>
                    。。
  </table>
</form>
  </body>
</html>
struts-xml文件代码：
<struts>
<constant name="struts.i18n.encoding" value="gb2312"></constant>

<package name="default" extends="struts-default">
       
          <action name="invest" class="investAction">
           <result name="investpage">/investment/plan/investment.plan.invest.jsp</result>
           <result name="success">/success.jsp</result>
          </action>
</package>
</struts>   applicationContext.xml文件代码：<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<bean id="investAction" class="com.hy.action.InvestAction" scope="prototype">
<property name="investActionService">
<ref bean="investActionService"/>
</property>
</bean>

</beans>
InvestAction类代码：
public class InvestAction  extends ActionSupport {
..........
private Txplanproj txplanproj;
private Txplaninfo txplaninfo;
//把从表单里拿的资料放到数据库中
public String investSave(){
System.out.println("investSave!!!");


System.out.println(txplanproj.getName());

Txplaninfo txplaninfo = new Txplaninfo();
System.out.println(txplaninfo.getArea());

return "success";
}


public Txplanproj getTxplanproj() {
return txplanproj;
}
public void setTxplanproj(Txplanproj txplanproj) {
this.txplanproj = txplanproj;
}
public Txplaninfo getTxplaninfo() {
return txplaninfo;
}
public void setTxplaninfo(Txplaninfo txplaninfo) {
this.txplaninfo = txplaninfo;
}
}