Dúvidas sobre JSTL

@bruno.daniel escreveu:

Boa noite galera,

Estou praticando a apostila Java FJ-21 da Caelum sobre Java EE e me deparei com uma dificuldade em um exercício aqui. O exercicio pede para listar os contatos de ContatoDao usando jsp:useBean e JSTL, porem ao rodar o arquivo .jsp o seguinte erro tem sido apresentado:

`

 out 18, 2016 10:08:45 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [jsp] in context with path [/CAP_07_TAGLIBS] threw exception                          
[/ExibirContatos.jsp (line: 18, column: 2) According to TLD or attribute directive in tag file, attribute items does not        
accept any expressions] with root cause
org.apache.jasper.JasperException: /ExibirContatos.jsp (line: 18, column: 2) According to TLD or attribute directive    
in tag file, attribute items does not accept any expressions
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:41)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:275)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:107)
at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1241)
at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:879)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1536)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1853)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
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.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:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2500)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2489)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

`

Já adicionei os dois .jars (Standard e o jstl) na minha lib, e ele as está reconhecendo, porem tenho notado que o parâmetro "itens", do foreach, quando clicado, tem exibido a seguinte mensagem: "items does not support runtime expressions".

PÁGINA EXIBIRCONTATOS.JSP

`

<%@page contentType="text/html"%> 
<%@page pageEncoding="UTF-8"%>   
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ taglib uri='http://java.sun.com/jsp/jstl/core' prefix='d'%>
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h"  %>
 <jsp:useBean id="dao" class="br.com.caelum.dao.ContatoDao"/>

<!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> Exibindo Contatos </title>
</head>

    <body>

	 <d:forEach var="contato" items=${dao.getLista}>
	 
		${contato.nome}, 
		${contato.email}, 
		${contato.endereco}, 
		${contato.dataNascimento} 
		
	</d:forEach>
	
     </body>

  </html>

`

Desde já agradeço por qualquer ajuda.

Mensagens: 2

Participantes: 1

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