遇到的問題：

在使用Eclipse開發Java Web時，呼叫DAO和Java Bean出現瞭如下錯誤：

嚴重: Servlet.service() for servlet [com.servlet.queryServlet] in context with path [/20180502] threw exception [javax.el.PropertyNotFoundException: Property 'Note' not found on type bean.employee] with root cause
javax.el.PropertyNotFoundException: Property 'Note' not found on type bean.employee
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:269)
	at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:221)
	at javax.el.BeanELResolver.property(BeanELResolver.java:356)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:95)
	at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
	at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:943)
	at org.apache.jsp.JSP.Index_jsp._jspService(Index_jsp.java:193)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:716)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
	at com.servlet.queryServlet.doGet(queryServlet.java:43)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
 

但是我的類中已經定義了geter和seter方法，如下：

而Jsp中的呼叫程式碼是通過EL實現，也匯入了相應的包。如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="f"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>首頁</title>
</head>
<body>
	<center>
		<form action="queryServlet">
			<table style="border-collapse: collapse; margin-top: 60px;"
				cellpadding="5px;" bordercolor="blue;" border="1px;" width="600px;">
				<tr height="35px;" align="center">
					<td colspan="6">員工姓名：<input type="text"
						style="padding: 5px; border-color: blue;" name="query" /><input
						type="submit" value="搜尋" style="margin-left: -10px; padding: 5px;" /></td>
					<td colspan="2"><a href="#"><font>新增</font> </a></td>
				</tr>
				<tr height="35px;" valign="middle" align="center">
					<td>序號</td>
					<td>姓名</td>
					<td>性別</td>
					<td>手機號</td>
					<td>職位</td>
					<td>生日</td>
					<td>備註</td>
					<td>操作</td>
				</tr>
				<%
					int count = 0;
				%>
				<f:forEach items="${list }" var="c">
					<tr height="35px;" valign="middle">
						<td><%=count++%></td>
						<td>${c.name }</td>
						<td>${c.sex }</td>
						<td>${c.mobile }</td>
						<td>${c.jobTitle }</td>
						<td>${c.birth }</td>
						<td>${c.note }</td>
						<td><a href="#"><font>刪除</font></a></td>
					</tr>
				</f:forEach>
			</table>
		</form>
	</center>
</body>
</html>
 

解決方案：(標紅字型根據實際情況運用)

1.可能你遇到的錯誤是“Property 'xxx' not found on type java.lang.String”異常

它的意思是String類中沒有xxx這個屬性，而修改的方法就是：
<c:forEach items="list" var="c" >  
修改成：
<c:forEach items="${list}" var="c" >

但是你需要注意它的錯誤是： java.lang.String對比type bean.Employee，其中對應src/bean.Employee.java檔案。而且我在JSP中已經是${

list}這種變量了，所以該方法不是該錯誤的解決方案。

2.有人說是bean的屬性名稱錯誤，或者沒有getter,setter方法，但是我的bean如下方法。

又參考錯誤“javax.el.PropertyNotFoundException: Property 'Note' not found on type com.manager.Paper”，此時的解決方案是：
 

private int pNum;
private int pSize;

建議你將這兩個屬性的名稱改為小寫：
 

private int pnum;
private int psize;

據說是因為命名規範，同時stu.EmpNo估計是大小寫錯了，換成 ${stu.empNo} 就能成功，因為EL是讀取屬性的getter方法的，一般按照屬性首字母小寫來處理。但是我的名字的欄位是id，因此該方法對我的情況也是行不通的。

3.如果上面兩個方法你仍然報錯，下面是我自己總結的方法：

嚴重: Servlet.service() for servlet [com.servlet.queryServlet] in context with path [/20180502] threw exception [javax.el.PropertyNotFoundException: Property 'Note' not found on type bean.employee] with root cause

javax.el.PropertyNotFoundException: Property 'Note' not found on type bean.employee

你需要做到的是：

(1).首先確保迴圈<c:forEach items="${list}" var="c">，然後呼叫是${c.name }、${c.sex }、、、${c.Note }(這個是我之前寫錯的地方，對照上文程式碼)；
(2).然後屬性命名最好是小寫的，當然首字母一定要小寫，如note；（很重要）
(3).在資料庫中create table student( stuid int,username varchar(20) )對應的Student類變數private Int id; private String name;其中型別需要一致，同時設定getter和setter方法;

經過上面的除錯，這個問題應該就已經搞定了。歡迎轉載。