FAQ（56）：JSP提取attribute内容出错：javax.el.PropertyNotFoundException: Property 'Code' not found on type com

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看Log：

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/userlist.jsp at line 13

10: <body>
11: 	<h4>XXXXXXXXXXXXXXXXXXX</h4>
12:     <c:forEach items="${userList}" var="arr">  
13:         <c:out value="${arr.Code}"></c:out>
14:         <c:out value="${arr.userName}"></c:out>
15:         <c:out value="${arr.gender}"></c:out>
16:         <c:out value="${arr.birthday}"></c:out>


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:579)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1286)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1041)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause

javax.el.PropertyNotFoundException: Property 'Code' not found on type com.User.entities.User
	javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:269)
	javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:221)
	javax.el.BeanELResolver.property(BeanELResolver.java:356)
	javax.el.BeanELResolver.getValue(BeanELResolver.java:95)
	org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
	org.apache.el.parser.AstValue.getValue(AstValue.java:169)
	org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
	org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:943)
	org.apache.jsp.WEB_002dINF.jsp.userlist_jsp._jspx_meth_c_005fout_005f0(userlist_jsp.java:237)
	org.apache.jsp.WEB_002dINF.jsp.userlist_jsp._jspx_meth_c_005fforEach_005f0(userlist_jsp.java:179)
	org.apache.jsp.WEB_002dINF.jsp.userlist_jsp._jspService(userlist_jsp.java:133)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
	org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
	org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1286)
	org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1041)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

解决：控制器Controller.java 使用了setAttribute方法后，jsp页面进行提取，但变量名称写错。修改为: <c:out value="${arr.userCode}"></c:out>