为什么这样写${elemCar.Car.startTime}取不到值？？报500

@RequestMapping("/findCars")
public String findCars(HttpSession session,String startStationName,String endStationName,String startedTime,Integer flag) {

      /*三者值均不能为空*/
    if(StringUtil.isEmpty(startStationName) || StringUtil.isEmpty(startedTime) ||StringUtil.isEmpty(endStationName)) 
    {
        if (flag == 1)//现在肯定为2啊？？？
        {
            return "pages/advancedsearch";
        } else {
            return "pages/home";
        }
    }

    Date tDate = DateUtil.transFormDateToDate(startedTime);
    if (tDate != null)
    {
        List<Car> trainAndTicketList =
        searchCarService.getCarList(startStationName, endStationName, tDate, flag);
        if (flag == 1) 
        {
            session.setAttribute("adtatList", trainAndTicketList);
            session.setAttribute("isAdPostResponse", true);
        } else {
            session.setAttribute("tatList", trainAndTicketList);
            session.setAttribute("isPostResponse", true);
        }

    }

为什么这样写

${elemCar.Car.startTime}取不到值？？

我的Car是这样的
public class Car {
private Date startTime;
//出发地
private String startStationName;
//达到地
private String endStationName;
//车型
private String carType;
//价钱
private Integer carPrice;
getter，setter toString都写好了。。。。省略去
}

    页面报错如下

    The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception
org.apache.jasper.JasperException: An exception occurred processing [/pages/home.jsp] at line [161]

158:
159:
160:
161: ${elemCar.Car.startTime}

写成elemCar.startTime等等即可，建议看一下forEach的用法，items是遍历的集合，var是集合中的元素，在这里，elemCar即是list中的元素Car