estou acompanhando a apostila da caelum, não estou conseguindo listar todos meu objetos.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!-- Adicionando JSTL -->
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!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=ISO-8859-1">
<title>Agenda de contatos com JSP e JSTL</title>
</head>
<body>
<c:import url="cabecalho.jsp" />
<!-- cria o DAO -->
<jsp:useBean id="dao" class="br.com.caelum.contato.ContatoDAO"/>
<table>
<!-- percorre contatos montando as linhas da tabela -->
<c:forEach var="contato" items="${dao.getContatos()}">
<tr>
<td>${contato.nome}</td>
</tr>
</c:forEach>
</table>
<br />
<a href="altera-contato.jsp">Adicionar</a>
<c:import url="rodape.jsp"></c:import>
</body>
</html>
public class ContatoDAO {
private Connection conection = null;
private List<Contato> contatos = new ArrayList<Contato>();
public ContatoDAO(Connection conn) {
this.conection = conn;
}
// RETORNAR TODOS OS CONTATOS EM UMA LIST
public List<Contato> getContatos() {
String sql = "SELECT * FROM contato";
try {
PreparedStatement stmt = conection.prepareStatement(sql);
//executa um select que retorna todos os métodos do get do objeto
ResultSet rs = stmt.executeQuery();
while (rs.next()) {
Contato contatoNovo = new Contato();
contatoNovo.setId(rs.getLong("id"));
contatoNovo.setNome(rs.getString("nome"));
contatoNovo.setEmail(rs.getString("email"));
contatoNovo.setEndereco(rs.getString("endereco"));
if (rs.getDate("data_nascimento") != null) {
Calendar dataNascimento = Calendar.getInstance();
dataNascimento.setTime(rs.getDate("data_nascimento"));
contatoNovo.setDataDeNascimento(dataNascimento);
}
this.contatos.add(contatoNovo);
}
stmt.close();
rs.close();
return this.contatos;
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
Erro
GRAVE: Servlet.service() for servlet [jsp] in context with path [/fj21-agenda] threw exception [/lista-contatos.jsp (line: [19], column: [1]) The value for the useBean class attribute [br.com.caelum.contato.ContatoDAO] is invalid.] with root cause
org.apache.jasper.JasperException: /lista-contatos.jsp (line: [19], column: [1]) The value for the useBean class attribute [br.com.caelum.contato.ContatoDAO] is invalid.
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:291)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:114)
at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1377)
at org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1187)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2444)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2450)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:471)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2392)
at org.apache.jasper.compiler.Generator.generate(Generator.java:3662)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:252)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:372)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:333)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:600)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at br.com.caelum.agenda.filtro.FiltroTempoDeExecucao.doFilter(FiltroTempoDeExecucao.java:22)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at br.com.caelum.agenda.filtro.FiltroConexao.doFilter(FiltroConexao.java:29)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:498)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:796)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1368)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)