javax.el.PropertyNotFoundException: Property 'XXX' not found on type bean.XXXXX

遇到的问题：

在使用Eclipse开发Java Web时，调用DAO和Java Bean出现了如下错误：

严重: 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)

但是我的类中已经定义了geter和seter方法，如下：

而Jsp中的调用代码是通过EL实现，也导入了相应的包。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>首页</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">员工姓名：<input type="text" style="padding: 5px; border-color: blue;" name="query" /><input type="submit" value="搜索" style="margin-left: -10px; padding: 5px;" /></td> <td colspan="2"><a href="#"><font>添加</font> </a></td> </tr> <tr height="35px;" valign="middle" align="center"> <td>序号</td> <td>姓名</td> <td>性别</td> <td>手机号</td> <td>职位</td> <td>生日</td> <td>备注</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>删除</font></a></td> </tr> </f:forEach> </table> </form> </center> </body> </html>

解决方案：(标红字体根据实际情况运用)

1.可能你遇到的错误是“Property 'xxx' not found on type java.lang.String”异常

它的意思是String类中没有xxx这个属性，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错误是： java.lang.String对比type bean.Employee，其中对应src/bean.Employee.java文件。而且我在JSP中已经是${list}这种变量了，所以该方法不是该错误的解决方案。

 

2.有人说是bean的属性名称错误，或者没有getter,setter方法，但是我的bean如下方法。

又参考错误“javax.el.PropertyNotFoundException: Property 'Note' not found on type com.manager.Paper”，此时的解决方案是：  

private int pNum; private int pSize;

建议你将这两个属性的名称改为小写：  

private int pnum; private int psize;

据说是因为命名规范，同时stu.EmpNo估计是大小写错了，换成 ${stu.empNo} 就能成功，因为EL是读取属性的getter方法的，一般按照属性首字母小写来处理。但是我的名字的字段是id，因此该方法对我的情况也是行不通的。

3.如果上面两个方法你仍然报错，下面是我自己总结的方法：

严重: 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).首先确保循环<c:forEach items="${list}" var="c">，然后调用是${c.name }、${c.sex }、、、${c.Note }(这个是我之前写错的地方，对照上文代码)；(2).然后属性命名最好是小写的，当然首字母一定要小写，如note；（很重要）(3).在数据库中create table student( stuid int,username varchar(20) )对应的Student类变量private Int id; private String name;其中类型需要一致，同时设置getter和setter方法;

 

经过上面的调试，这个问题应该就已经搞定了。欢迎转载。