javax.servlet.ServletException: javax/el/ValueExpression的问题

fumin2009 2009-03-23 06:17:56

我在使用jstl遍历集合的时候报了这个异常，不知道怎么解决
遍历的代码是这些

<c:forEach var="classroom" items="${result}">

				<tr>

					<td>

						${classroom.classroomId }

					</td>

					<td>

						${classroom.roomName }

					</td>

					<td>

						${classroom.capacity }

					</td>

					<td>

						${classroom.description }

					</td>

					<td></td>

				</tr>

			</c:forEach>

是通过重写SimpleFormController的referenceData(HttpServletRequest request)方法初始化result参数的

protected Map referenceData(HttpServletRequest request) throws Exception{

		QueryResult<Classroom> result = classroomService.findClassrooms(1);

		System.out.println(result);

		return new ModelMap().addObject("result", result.getResult());

	}

结果报了异常
javax.servlet.ServletException: javax/el/ValueExpression
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:273)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:240)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:252)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1173)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:901)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

如果直接用EL表达式输出result，像${result}这样而不是循环，能正确输出集合内的数据：
[[classroomId:103,roomName:信工101,capacity:120,description:多媒体教室], [classroomId:104,roomName:信工102,capacity:120,description:多媒体教室], [classroomId:105,roomName:信工103,capacity:120,description:多媒体教室], [classroomId:106,roomName:信工104,capacity:120,description:多媒体教室], [classroomId:107,roomName:信工105,capacity:60,description:多媒体教室]]

为什么一用<c:forEach>就出错了呢？

...全文