JBPM4.4查询待办任务怎么没有数据？求指点！！!

首先时部署请假流程，然后启动流程，代码如下/**
 * 开始申请
 * @return
 */
public String startApply(){
//部署流程定义
//String proceddDefinitionId = getLeaveService().deployNew();
String deploymentId = getLeaveService().deployZIPNew();

//启动流程定义
String staffName = ((Staff)getHttpSession().getAttribute(Globarle.SYS_CURRENTUSER)).getStaffName();
ProcessDefinition processDefinition = getLeaveService().getPDByDeploymentId(deploymentId);
getLeaveService().startProcessInstanceById(staffName, processDefinition.getId());
return "toTaskList";
}
然后我struts里配置的时redirectAction，即直接跳转到查询用户代办任务的Action方法getTasks，但是经测试，返回的list始终size==0,不知道怎么解决，望高手指点！/**
 * 获取当前用户的待办任务
 * @return
 */
public String getTasks(){
String assignee = ((Staff)getHttpSession().getAttribute(Globarle.SYS_CURRENTUSER)).getStaffName();
this.getModel().setTaskList(getLeaveService().getTasksList(assignee));
System.out.println("待办任务个数：" + getLeaveService().getTasksList(assignee).size());
getRequest().setAttribute("taskList", this.getModel().getTaskList());
return "taskList";
}jsp页面遍历显示待办任务的相关代码：<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" isELIgnored="false"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
request.setAttribute("basepath",basePath);
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>待办任务列表页面</title>
    
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<style type="text/css">
#taskcaption{
    width:700px;
    height:200px;
    position:absolute;
    left:50%;
    margin-left:-350px;
    margin-top:15px;
    text-align:center;
    border:1px #999999 solid;
}
table{
    border-collapse:collapse;
}
</style>  </head>
  
  <body>
      <div id="taskcaption">
         <table border="1" width="100%" cellpadding="3" cellspacing="1">
      <caption><strong>待办任务</strong></caption>
      <thead>
        <tr style="text-align:center;font-weight:400;">
          <td>任务ID</td>
          <td>任务名称</td>
          <td>任务处理人</td>
          <td>操作</td>
        </tr>
      </thead>
      <tbody>
    <s:if test="#request.taskList.size == 0">
    <tr>
        <td colspan="4">
            <span style="width:100%;font-size:16px;font-weight:800;text-align:center;color:#ff0000;">
                                您暂无待办任务
            </span>
        </td>
    </tr>
    </s:if>
    <s:else>
<s:iterator var="task" value="#request.taskList">
    <tr>
      <td>${task.id}</td>
      <td>${task.name}</td>
      <td>${task.assignee}</td>
      <td><a href="${basepath}${task.formResourceName}?taskId=${task.id}">处理</a></td>
    </tr>
</s:iterator>
</s:else>
   </tbody>
</table> 
      </div>
  </body>
</html>