javax.el.PropertyNotFoundException: 类型[cn.cqsw.pojo.Course]上找不到属性[CourseId]

今天在JSP利用EL表达式取值报了 "javax.el.PropertyNotFoundException”
 1 Caused by: org.apache.jasper.JasperException: 在 [33] 行处理 [/course-list.jsp] 时发生异常
 2 
 3 30:             </tr>
 4 31:             <c:forEach var="course" items="${courses}">
 5 32:                 <tr>
 6 33:                     <td>${course.CourseId}</td>
 7 34:                     <td>${course.courseName}</td>
 8 35:                     <td>${course.courseMajor}</td>
 9 36:                     <td>${course.userName}</td>
10 
11 
12 Stacktrace:
13     at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:617)
14     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514)
15     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
16     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
17     at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
18     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
19     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
20     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
21     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
22     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
23     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)
24     at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:470)
25     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)
26     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
27     at cn.cqsw.controller.CourseServlet.findAll(CourseServlet.java:33)
28     ... 30 more
29 Caused by: javax.el.PropertyNotFoundException: 类型[cn.cqsw.pojo.Course]上找不到属性[CourseId]
30     at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:260)
31     at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:212)
32     at javax.el.BeanELResolver.property(BeanELResolver.java:333)
33     at javax.el.BeanELResolver.getValue(BeanELResolver.java:92)
34     at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
35     at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
36     at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190)
37     at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:944)
38     at org.apache.jsp.course_002dlist_jsp._jspx_meth_c_005fforEach_005f0(course_002dlist_jsp.java:192)
39     at org.apache.jsp.course_002dlist_jsp._jspService(course_002dlist_jsp.java:144)
40     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
41     at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
42     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
43     ... 43 more

 private Integer CourseId;
    private String courseName;
    private String courseMajor;
    private String userName;
    private String addDate;

 1 <c:forEach var="course" items="${courses}">
 2                 <tr>
 3                     <td>${course.courseId}</td>
 4                     <td>${course.courseName}</td>
 5                     <td>${course.courseMajor}</td>
 6                     <td>${course.userName}</td>
 7                     <td>${course.addDate}</td>
 8                     <td><input type="button" value="删除" onclick="location.href=‘/course?method=delById&cid=${course.courseId}‘"></td>
 9                 </tr>
10             </c:forEach>