Action中的list和Jsp中的<s:select>标签怎么进行传值

我的Action从数据库中取值，存在一个List里面，如List<**Bean>，测试有值，现在想把这个List传到Jsp页面的<s:select>标签中，总报错。
Action主要代码如下：List<DptSelectBean> selectBeanList =new ArrayList<DptSelectBean>();

selectBeanList = accountAddService.dptSelect();

setSelectBeanList(selectBeanList);
Jsp主要代码如下：
<s:select list="selectBeanList" listkey="departmentID" listvalue="departmentName" name="accountInputBean.departmentName" headerkey="departmentID" headervalue="请选择" multiple="true">
</s:select>
DptSelectBean代码如下
package dl.chamstone.com.cn.bean.account;

import dl.chamstone.com.cn.bean.BeanObject;

public class DptSelectBean implements BeanObject {

private static final long serialVersionUID = -2867242004393508889L;

private Integer departmentID;

private String departmentName;
/**
* @return the departmentID
*/
public Integer getDepartmentID() {
return departmentID;
}
/**
* @param departmentID the departmentID to set
*/
public void setDepartmentID(Integer departmentID) {
this.departmentID = departmentID;
}
/**
* @return the departmentName
*/
public String getDepartmentName() {
return departmentName;
}
/**
* @param departmentName the departmentName to set
*/
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}

/** default constructor */
public DptSelectBean() {
}

}
报错信息：页面上报错：Struts Problem Report
Struts has detected an unhandled exception:

Messages: Stream closed

File: org/apache/jasper/runtime/JspWriterImpl.java
Line number: 204

--------------------------------------------------------------------------------

Stacktraces
java.io.IOException: Stream closed
Eclipes中报错：org.apache.jasper.JasperException: tag 'select', field 'list', name 'accountInputBean.departmentName': The requested list key 'selectBeanList' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
哪位高人帮忙分析下，谢谢！

1.很有可能你查出来的是空，所以没法循环
2.我测试了下，改动下Action代码
List<DptSelectBean> selectBeanList =new ArrayList<DptSelectBean>();
public List<DptSelectBean> getSelectBeanList() {
return selectBeanList;
}

public void setSelectBeanList(List<DptSelectBean> selectBeanList) {
this.selectBeanList = selectBeanList;
}

@Override
public String execute() throws Exception {
// selectBeanList = accountAddService.dptSelect();
DptSelectBean d1=new DptSelectBean();
d1.setDepartmentID(1);
d1.setDepartmentName("a");
DptSelectBean d2=new DptSelectBean();
d2.setDepartmentName("b");
d2.setDepartmentID(2);
selectBeanList.add(d1);
selectBeanList.add(d2);
// setSelectBeanList(selectBeanList);

return SUCCESS;
}
没有任何问题

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