Description The server encountered an unexpected condition that prevented it from fulfilling the request.-慕课网

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

来源：8-7 商品详细信息显示

qq_不停歇的小马达_0

2018-11-08 16:40

org.apache.jasper.JasperException: An exception occurred processing JSP page /details.jsp at line 53

50:           <!-- 鍟嗗搧璇︽儏 -->
51:           <%
52:           	ItemsDao itemDao = new ItemsDao();
53:             Items item = itemDao.getItemsById(Integer.parseInt(request.getParameter("id")));
54:           	if(item != null)
55:           	{
56:           %>

检查了几遍，感觉代码和老师敲的一样，哪里不对呢？

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