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Criando uma autenticacao de usuarios

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

por Cremildo Lissane
| 106k xp | 99 posts

Oi gente!

Quando logo um usuario invalido, o VRaptor lança a seginte excepetion:

HTTP Status 500 - net.vidageek.mirror.exception.ReflectionProviderException: Could not invoke method autentica


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.dao.UsuarioDao.existe(UsuarioDao.java:22)
    br.com.caelum.vraptor.controller.LoginController.autentica(LoginController.java:43)
    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/8.0.29 logs.


Apache Tomcat/8.0.29

Aqui esta o meu codigo:

LoginController

package br.com.caelum.vraptor.controller;

import javax.inject.Inject;

import br.com.caelum.vraptor.Controller;
import br.com.caelum.vraptor.Get;
import br.com.caelum.vraptor.Post;
import br.com.caelum.vraptor.Result;
import br.com.caelum.vraptor.dao.UsuarioDao;
import br.com.caelum.vraptor.model.Usuario;
import br.com.caelum.vraptor.model.UsuarioLogado;
import br.com.caelum.vraptor.validator.I18nMessage;
import br.com.caelum.vraptor.validator.Validator;

@Controller
public class LoginController {

    private final Validator validator;
    private final UsuarioDao usDao;
    private final Result result;
    private final UsuarioLogado usLogado;

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

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

    @Get
    public void formulario() {

    }

    @Post
    public void autentica(Usuario usuario) {
        if (!usDao.existe(usuario)) {
            validator.add(new I18nMessage("login", "login.invalido"));
            validator.onErrorUsePageOf(this).formulario();
        }
        usLogado.setUsuario(usuario);
        result.redirectTo(ProdutoController.class).lista();
    }
}

UsuarioLogado

package br.com.caelum.vraptor.model;

import java.io.Serializable;

import javax.enterprise.context.SessionScoped;
import javax.inject.Named;

@SessionScoped
@Named
public class UsuarioLogado implements Serializable {

    private Usuario usuario;

    public Usuario getUsuario() {
        return usuario;
    }

    public void setUsuario(Usuario usuario) {
        this.usuario = usuario;
    }
}

/login/formulario.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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"/>
<link rel="stylesheet" type="text/css" href="../base.css"/>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Formulario de Login</title>
</head>
<body>
<h2 style="text-align:center; color:blue;">LOGIN DO USUARIO</h2>
<div class="container">
<form class="form-signin" action="<c:url value='/login/autentica'/>" method="post">
<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" type="submit">Login</button>
</form>
<c:if test="${not empty errors}">
    <div class="alert alert-danger">
    <c:forEach items="${errors}" var="error">
    ${error.category} : ${error.message}<br />
    </c:forEach>
    </div>
    </c:if>
</div>
</body>
</html>

Não consigo localizar o erro

2 respostas
solução!
por Cremildo Lissane
| 106k xp | 99 posts

Já descobri qual era o problema!

Havia esquecido de descomentar a injecção de dependências no construtor da classe UsuarioDao:

Antes estava asssim:

public class UsuarioDao {

    private final EntityManager em;

    //@Inject
    public UsuarioDao(EntityManager em) {
        this.em = em;
    }
//Outros métodos...
}

Agora está assim:

public class UsuarioDao {

    private final EntityManager em;

    @Inject
    public UsuarioDao(EntityManager em) {
        this.em = em;
    }
//Outros métodos...
}
por Estudante
| 379.1k xp | 13 posts

Estava com mesmo problema.. Valeu!!