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Dúvida no Ex. 3 da Aula 8 - Criando uma autenticação de usuários

Referente ao curso VRaptor4: Alta produtividade com aplicações web em java, no capítulo Criando uma autenticação de usuários e atividade Autenticando usuários!

por Felipe Bento Britto
| 148.9k xp | 7 posts

Bom dia! Quando eu clico no botão de login na tela de login acontece o seguinte erro:

type Exception report

message net.vidageek.mirror.exception.ReflectionProviderException: Could not invoke method autentica

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: net.vidageek.mirror.exception.ReflectionProviderException: Could not invoke method autentica
    br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:120)
root cause

net.vidageek.mirror.exception.ReflectionProviderException: Could not invoke method autentica
    net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:45)
    net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    br.com.caelum.vraptor.observer.ExecuteMethod.execute(ExecuteMethod.java:87)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:78)
    br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:98)
    br.com.caelum.vraptor.interceptor.FlashInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:75)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.start(DefaultInterceptorStack.java:93)
    br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.start(Unknown Source)
    br.com.caelum.vraptor.observer.RequestHandlerObserver.handle(RequestHandlerObserver.java:86)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:116)
root cause

java.lang.NullPointerException
    br.com.caelum.vraptor.controller.LoginController.autentica(LoginController.java:41)
    br.com.caelum.vraptor.controller.LoginController$Proxy$_$$_WeldClientProxy.autentica(Unknown Source)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    net.vidageek.mirror.provider.java.PureJavaMethodReflectionProvider.invoke(PureJavaMethodReflectionProvider.java:38)
    net.vidageek.mirror.invoke.MethodHandlerByMethod.withArgs(MethodHandlerByMethod.java:54)
    br.com.caelum.vraptor.observer.ExecuteMethod.execute(ExecuteMethod.java:87)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:78)
    br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:98)
    br.com.caelum.vraptor.interceptor.FlashInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor.intercept(ExceptionHandlerInterceptor.java:75)
    br.com.caelum.vraptor.interceptor.ExceptionHandlerInterceptor$Proxy$_$$_WeldClientProxy.intercept(Unknown Source)
    br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:58)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:83)
    br.com.caelum.vraptor.core.DefaultInterceptorStack.start(DefaultInterceptorStack.java:93)
    br.com.caelum.vraptor.core.DefaultInterceptorStack$Proxy$_$$_WeldClientProxy.start(Unknown Source)
    br.com.caelum.vraptor.observer.RequestHandlerObserver.handle(RequestHandlerObserver.java:86)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:93)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:266)
    org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
    org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:232)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:169)
    org.jboss.weld.event.ObserverNotifier.notifyObserver(ObserverNotifier.java:165)
    org.jboss.weld.event.ObserverNotifier.notifyObservers(ObserverNotifier.java:119)
    org.jboss.weld.event.ObserverNotifier.fireEvent(ObserverNotifier.java:112)
    org.jboss.weld.event.EventImpl.fire(EventImpl.java:83)
    br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:116)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.33 logs.

Segue o código da classe e jsp:

@Controller
public class LoginController {

    private final UsuarioDao dao;
    private final Validator validator;
    private final Result result;
    private final UsuarioLogado usuarioLogado;

    public LoginController(UsuarioDao dao, Validator validator, Result result, UsuarioLogado usuarioLogado) {
        this.dao = dao;
        this.validator = validator;
        this.result = result;
        this.usuarioLogado = usuarioLogado;
    }

    public LoginController() {
    this(null, null, null, null);
    }

    @Get
    public void formulario() {

    }

    @Post
    public void autentica(Usuario usuario) {
        if(!dao.existe(usuario)){
            validator.add(new SimpleMessage("login", "ERRO"));
            validator.onErrorUsePageOf(this).formulario();
        }
        usuarioLogado.setUsuario(usuario);
        result.redirectTo(ProdutoController.class).lista();
    }

}
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<link rel="stylesheet" type="text/css" href="../bootstrap/css/bootstrap.css">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Formulário de Login</title>
</head>
<body>
<div class="container">
 <form class="form-signin" action="<c:url value='/login/autentica'/>" method="post">
  <h2 class="form-signin-heading">Faça login para acessar o VRaptor-Produtos</h2>
  <input type="text" class="form-control" name="usuario.nome" placeholder="Nome"/>
  <input type="password" class="form-control" name="usuario.senha" placeholder="Senha"/>
  <button class="btn btn-lg btn-primary btn-block" type="submit">Login</button>
 </form>
</div>   
    <c:if test="${not empty errors}">
        <div class="alert alert-danger">
            <c:forEach var="error" items="${errors}">
                ${error.category} - ${error.message}<br />
            </c:forEach>
        </div>
    </c:if>
</div> 
</body>
</html>
7 respostas
solução!
por Lucas Félix
| 443.5k xp | 597 posts
Alura Scuba Team Instrutor e Desenvolvedor

Oi Felipe, tudo bem?

Pelo código que você postou acredito que o primeiro passo é anotar o contrutor com @Inject:

@Inject
 public LoginController(UsuarioDao dao, Validator validator, Result result, UsuarioLogado usuarioLogado) {
        this.dao = dao;
        this.validator = validator;
        this.result = result;
        this.usuarioLogado = usuarioLogado;
    }

Avisa no que deu?

Abraço!

por Felipe Bento Britto
| 148.9k xp | 7 posts

Consegui resolver, acho que era porque a tag

tava errada. Agora estou com o seguinte erro 
type Status report

message /vraptor-produtos/login/%3Cc:url%20value='/login/autentica'/%3E

description The requested resource is not available.
por Felipe Bento Britto
| 148.9k xp | 7 posts

Verdade, realmente estava faltando o @Inject. Mas o erro da minha resposta acima ainda persiste.

por Lucas Félix
| 443.5k xp | 597 posts
Alura Scuba Team Instrutor e Desenvolvedor

Oi Felipe, faltava sim o @Inject. Por isso o NullPointer. :)

Mas agora, você modificou o código da página jsp? Se sim posta de novo aqui? Nao parece haver problemas com a que você postou anteriormente.

por Felipe Bento Britto
| 148.9k xp | 7 posts

Olá Lucas, não modifiquei nada :/

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<link rel="stylesheet" type="text/css" href="../bootstrap/css/bootstrap.css">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Formulário de Login</title>
</head>
<body>
<div class="container">
 <form class="form-signin" action="<c:url value='/login/autentica'/>" method="post">
  <h2 class="form-signin-heading">Faça login para acessar o VRaptor-Produtos</h2>
  <input type="text" class="form-control" name="usuario.nome" placeholder="Nome"/>
  <input type="password" class="form-control" name="usuario.senha" placeholder="Senha"/>
  <button class="btn btn-lg btn-primary btn-block" type="submit">Login</button>
 </form>

         <c:if test="${not empty errors}">
        <div class="alert alert-danger">
            <c:forEach var="error" items="${errors}">
                ${error.category} - ${error.message}<br />
            </c:forEach>
        </div>
    </c:if>
</div>    
</body>
</html>

Será que tem algo a ver com o caractere ' ?

por Felipe Bento Britto
| 148.9k xp | 7 posts

Ok, descobri. Por algum motivo que não sei dizer acabeiremovendo o import

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

Muito obrigado Lucas e desculpa o incômodo.

por Lucas Félix
| 443.5k xp | 597 posts
Alura Scuba Team Instrutor e Desenvolvedor

Ahh Felipe, verdade! Eu não tinha percebido!

Que isso, que bom que descobriu. Qualquer dúvida nos deixe saber.

Bons estudos!