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我正在學習jsp，servlets等等。我得到一個異常，我只是無法找出錯誤。我有點知道El無法找到錯誤的字段，但我的JavaBean很好。傳遞給jsp頁面的列表也很好。 已經改變了jsp和servlet很多，異常繼續。javax.el.PropertyNotFoundException：
希望some1能給我一隻手。
繼承人的代碼和堆棧跟蹤：
堆棧跟蹤：
SEVERE: Servlet.service() for servlet jsp threw exception
javax.el.PropertyNotFoundException: Property 'nome' not found on type java.lang.String
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:268)
at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:221)
at javax.el.BeanELResolver.property(BeanELResolver.java:355)
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.admin.buscar_jsp._jspx_meth_c_005fforEach_005f0(buscar_jsp.java:253)
at org.apache.jsp.admin.buscar_jsp._jspx_meth_c_005fif_005f0(buscar_jsp.java:215)
at org.apache.jsp.admin.buscar_jsp._jspService(buscar_jsp.java:162)
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:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:719)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:390)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:317)
at control.ControleProduto.buscar(ControleProduto.java:140)
at control.ControleProduto.execute(ControleProduto.java:65)
at control.ControleProduto.doPost(ControleProduto.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
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:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
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)
Excessa no buscar An exception occurred processing JSP page /admin/buscar.jsp at line 33
30: </tr>
31: <c:forEach items="lista" var="prod">
32: <tr>
33: <td>${prod.nome }</td>
34: <td>${prod.estoque }</td>
35: <td><fmt:formatNumber value="${prod.preco}" type="currency"/> </td>
36: <td> <fmt:formatDate value="${prod.validade}" pattern="dd/MM/yyyy" /> </td>
Stacktrace:
org.apache.jasper.JasperException: An exception occurred processing JSP page /admin/buscar.jsp at line 33
30: </tr>
31: <c:forEach items="lista" var="prod">
32: <tr>
33: <td>${prod.nome }</td>
34: <td>${prod.estoque }</td>
35: <td><fmt:formatNumber value="${prod.preco}" type="currency"/> </td>
36: <td> <fmt:formatDate value="${prod.validade}" pattern="dd/MM/yyyy" /> </td>
Stacktrace:
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:574)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
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:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:719)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:465)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:390)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:317)
at control.ControleProduto.buscar(ControleProduto.java:140)
at control.ControleProduto.execute(ControleProduto.java:65)
at control.ControleProduto.doPost(ControleProduto.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
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:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.el.PropertyNotFoundException: Property 'nome' not found on type java.lang.String
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:268)
at javax.el.BeanELResolver$BeanProperties.access$300(BeanELResolver.java:221)
at javax.el.BeanELResolver.property(BeanELResolver.java:355)
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.admin.buscar_jsp._jspx_meth_c_005fforEach_005f0(buscar_jsp.java:253)
at org.apache.jsp.admin.buscar_jsp._jspx_meth_c_005fif_005f0(buscar_jsp.java:215)
at org.apache.jsp.admin.buscar_jsp._jspService(buscar_jsp.java:162)
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)
... 38 more
繼承人的豆：
package entity;
import java.util.Date;
import java.util.GregorianCalendar;
public class Produto {
private Integer idProduto;
private String nome;
private Integer estoque;
private Double preco;
private Date validade;
/*
* Produto tem uma Categoria
*/
private Categoria categoria;
public Produto(Integer idProduto, String nome, Integer estoque,
Double preco, Date validade) {
super();
this.idProduto = idProduto;
this.nome = nome;
this.estoque = estoque;
this.preco = preco;
this.validade = validade;
}
public Produto() {
super();
}
public Categoria getCategoria() {
return categoria;
}
public void setCategoria(Categoria categoria) {
this.categoria = categoria;
}
public Integer getIdProduto() {
return idProduto;
}
public void setIdProduto(Integer idProduto) {
this.idProduto = idProduto;
}
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public Integer getEstoque() {
return estoque;
}
public void setEstoque(Integer estoque) {
this.estoque = estoque;
}
public Double getPreco() {
return preco;
}
public void setPreco(Double preco) {
this.preco = preco;
}
public Date getValidade() {
return validade;
}
public void setValidade(Date validade) {
this.validade = validade;
}
public static Date converterData(String data){
String[] novaData = data.split("/");
GregorianCalendar cal = new GregorianCalendar(
new Integer(novaData[2]),
new Integer(novaData[1]) - 1,
new Integer(novaData[0]));
return cal.getTime();
}
@Override
public String toString() {
return "Produto [idProduto=" + idProduto + ", nome=" + nome
+ ", estoque=" + estoque + ", preco=" + preco + ", validade="
+ validade + "]";
}
}
JSP頁面：
Topo.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Sistema de Controle de Produtos</title>
<!-- CSS Styles -->
<link rel="stylesheet" type="text/css"
href="${pageContext.request.contextPath}/bootstrap/css/bootstrap.min.css">
<!-- Tabela com cores diferentes -->
<link rel="stylesheet" type="text/css"
href="${pageContext.request.contextPath}/css/tabelacomcores.css">
</head>
<body>
<!-- Como criar submenus? -->
<div class="container" >
<div class="col-xs-12">
<ul class="nav nav-pills">
<li><a href="index.jsp">Cadastrar</a></li>
<li><a href="buscar.jsp">Consultar</a></li>
<li><a href="#">Sair</a>
</ul>
</div> <!-- Menu -->
rodape.jsp
</div>
</div> <!-- container -->
</body>
</html>
buscar.jsp
<jsp:include page="topo.jsp"></jsp:include>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<!-- Format library -->
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<h3 class="page-header">Buscar produtos</h3>
<form method="post" action="buscar.html">
<div class="form-group">
Nome :
<input type="text" name="nome" value="${nome}" class="form-control">
</div>
<input type="submit" value="Buscar" class="btn btn-primary">
</form>
${msg }
<c:if test="${fn:length(lista)>0}">
<table class="table table-bordered">
<tr>
<th>Nome</th>
<th>Estoque</th>
<th>Preco</th>
<th>Validade</th>
<th>Categoria</th>
<th></th>
</tr>
<c:forEach items="lista" var="prod">
<tr>
<td>${prod.nome }</td>
<td>${prod.estoque }</td>
<td><fmt:formatNumber value="${prod.preco}" type="currency"/> </td>
<td> <fmt:formatDate value="${prod.validade}" pattern="dd/MM/yyyy" /> </td>
<td>${prod.categoria.nomeCategoria }</td>
<td>
<a href="editar.html?id=${prod.idProduto}" class="btn btn-warning">Editar</a>
<a href="excluir.html?id=${prod.idProduto}" class="btn btn-danger"
onclick="return confirm('Deseja excluir realmente o produto?')">Excluir</a>
</td>
</tr>
</c:forEach>
</table>
</c:if>
<jsp:include page="rodape.jsp"></jsp:include>
Dao.java
package persistence;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Dao {
Connection con;
PreparedStatement stmt;
ResultSet rs;
private final String URL = "jdbc:mysql://localhost:3306/aula";
private final String USER = "root";
private final String PASS = "something";
protected void open()throws Exception{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(URL, USER, PASS);
}
protected void close()throws Exception{
if(rs != null)
rs.close();
if(stmt != null)
stmt.close();
if(con != null)
con.close();
}
}
ProdutoDao.java
package persistence;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import entity.Categoria;
import entity.Produto;
public class ProdutoDao extends Dao {
public void cadastrar(Produto prod)throws Exception{
open();
stmt = con.prepareStatement("insert into produto (nome,estoque,preco,validade,idCategoria)"
+ " values(?,?,?,?,?)");
stmt.setString(1, prod.getNome());
stmt.setInt(2, prod.getEstoque());
stmt.setDouble(3, prod.getPreco());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
stmt.setString(4, sdf.format(prod.getValidade()));
stmt.setInt(5, prod.getCategoria().getIdCategoria());
stmt.execute();
close();
}
public List<Produto> buscar(String nome)throws Exception{
open();
stmt = con.prepareStatement("select * from produto inner join categoria "
+ " on produto.idcategoria = categoria.idcategoria where nome like ?");
stmt.setString(1, nome + "%");
rs = stmt.executeQuery();
List<Produto> lista = new ArrayList<Produto>();
while(rs.next()){
Produto prod = new Produto(rs.getInt("idproduto"), rs.getString("nome"),
rs.getInt("estoque"), rs.getDouble("preco"), rs.getDate("validade"));
Categoria cat = new Categoria(rs.getInt("idcategoria"),
rs.getString("nomecategoria"));
prod.setCategoria(cat);
lista.add(prod);
}
close();
return lista;
}
/**
* Busca pela ID do produto
* @param id
* @return
* @throws Exception
*/
public Produto buscar(int id) throws Exception{
open();
stmt = con.prepareStatement("select * from produto inner join categoria "
+ " on idcategoria = idcategoria where idproduto = ?");
stmt.setInt(1, id);
Produto prod = null;
rs = stmt.executeQuery();
if(rs.next()){
prod = new Produto(rs.getInt("idproduto"), rs.getString("nome"),
rs.getInt("estoque"), rs.getDouble("preco"), rs.getDate("validade"));
Categoria cat = new Categoria(rs.getInt("idcategoria"),
rs.getString("nomecategoria"));
prod.setCategoria(cat);
}
close();
return prod;
}
public void excluir(int id)throws Exception{
open();
stmt = con.prepareStatement("delete from produto where idproduto = ?");
stmt.setInt(1, id);
stmt.execute();
close();
}
public void editar(Produto prod)throws Exception{
open();
stmt = con.prepareStatement("update produto set nome = ?, estoque = ?, preco = ?, "
+ " validade = ?, categoria_idcategoria = ? where idproduto = ?");
stmt.setString(1, prod.getNome());
stmt.setInt(2, prod.getEstoque());
stmt.setDouble(3, prod.getPreco());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
stmt.setString(4, sdf.format(prod.getValidade()));
stmt.setInt(5, prod.getCategoria().getIdCategoria());
stmt.setInt(6, prod.getIdProduto());
stmt.execute();
close();
}
}