Struts2.0 表单中用到select标签提交时出错
在表单用中到了select标签，页面初始化时一切正常，select也正常初始化
可是当我提交时就出现如下错误：
严重: Servlet.service() for servlet jsp threw exception
tag 'select', field 'list', name 'functions.typeId': The requested list key '%{types}' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
在应用中我用到两个Action,两个jsp页面
一个FunctionsAction，一个FunctionstypeAction
一个add_function.jsp,一个add_functions_success.jsp
具休流程是我从FunctionstypeAction中获取一个functionstypes的List
用来初始化add_function.jsp中的select标签，
然后把表单提交给FunctionsAction中的insert方法
add_function.jsp初始化是正常的，
但是点提交到FunctionsAction的时候页面空白
我看了一下源文件，页面只执行了一部分，
代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>首页</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /></head><body style="text-align:center;"><form id="insertFunction" onsubmit="return true;" action="insertFunction.action" method="post"><table name="code">package com.mp.job.baseinfo.action;import java.util.List;import com.mp.job.baseinfo.service.IFunctionsService;import com.mp.job.baseinfo.vo.Functions;import com.mp.job.common.service.JobActionSupport;import com.mp.job.exception.BaseException;import com.mp.job.util.Pager;@SuppressWarnings("serial")public class FunctionsAction extends JobActionSupport {private IFunctionsService functionsService;private Functions functions;private List functionsRecords;@SuppressWarnings("unused")private Object[][] params;private Pager pager; <!-- getter和setter这里省略！ -->public String insert()throws BaseException{try{functionsService.save(functions);}catch(Exception e){e.toString();addActionMessage("插入数据时出现异常！");return INPUT;}return SUCCESS;}<!-- 其他的方法省略 -->}package com.mp.job.baseinfo.action;import java.util.List;import com.mp.job.baseinfo.service.IFunctionstypeService;import com.mp.job.baseinfo.vo.Functionstype;import com.mp.job.common.service.JobActionSupport;import com.mp.job.exception.BaseException;import com.mp.job.util.Pager;@SuppressWarnings("serial")public class FunctionstypeAction extends JobActionSupport {private IFunctionstypeService functionstypeService;private Functionstype functionstype;private List functionstypes;private List functionstypeRecords;@SuppressWarnings("unused")private Object[][] params;private Pager pager;<!-- getter和setter这里省略！ -->@SuppressWarnings("unchecked")public String getAllFunctionstypes()throws BaseException{functionstypes = functionstypeService.findAll();return null;}<!-- 其他方法这里省略！ -->public List getFunctionstypes() {return functionstypes;}public void setFunctionstypes(List functionstypes) {this.functionstypes = functionstypes;}}<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><!-- ================================================================== --><!-- 名称相关functionsAction --><!-- ================================================================== --><package name="functions" namespace="/admin/BaseInfo"extends="struts-default"><action name="insertFunction" namespace="/admin/BaseInfo"extends="struts-default"><action name="getAllFunctionstypes" name="code"><%@page language="java" pageEncoding="utf-8"%><%@taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>首页</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /></head><body style="text-align:center;"><s:actionmessage /><s:action name="getAllFunctionstypes" id="getAllFunctionstypes" /><s:set name="types" value="#getAllFunctionstypes.functionstypes"/><s:form action="insertFunction.action" method="post"><s:select list="%{types}" listKey="id" listValue="name" name="functions.typeId" label="类型"/><s:textfield name="functions.name" label="名称"/><s:submit value="添加"/></s:form><hr/></body></html><%@page language="java" pageEncoding="utf-8"%><%@taglib prefix="s" uri="/struts-tags"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>首页</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /></head><body style="text-align:center;"><table width="350px" height="150px" align="center" bgcolor="#ffff00"><tr><td style="color:#00ff00;"><b>成功添加数据！</b><br/><br/><a href="add_function.jsp">继续添加</a>????<a href="listAllFunctions.action">查看全部</a></td></tr></table></body></html>