添加員工，點擊保存按鈕后，部門不能保存，其他的都添加成功了
<tr>
<td>所屬部門：</td>
<td><s:select name="department.did" list="list" listKey="did" listValue="dname" headerKey="" headerValue="--請選擇--"></s:select></td>
</tr>
actionn：
public String save(){
employeeService.save(employee);
return "save";
}
service：
public void save(Employee employee) {
// TODO Auto-generated method stub
employeeDao.save(employee);
}
DAO：
public void save(Employee employee) {
// TODO Auto-generated method stub
this.getHibernateTemplate().save(employee);
}
Error setting expression 'department.did' with value '[Ljava.lang.String;@6c102d07'
ognl.OgnlException: target is null for setProperty(null, "did", [Ljava.lang.String;@6c102d07)
