在我的 webapp 中，当我单击登录链接时，Tomcat 网络服务器会抛出以下异常：
exception
javax.servlet.ServletException: /aluno_jsf.xhtml: Property 'logout' not found on type
br.com.aluno.controller.LoginMB
javax.faces.webapp.FacesServlet.service(FacesServlet.java:422)
root cause
javax.el.ELException: /aluno_jsf.xhtml: Property 'logout' not found on type
br.com.aluno.controller.LoginMB
[...]
这是我的@ManagedBean：
package br.com.aluno.controller;
import java.io.Serializable;
import java.util.Collection;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;
import br.com.aluno.dao.DaoFactory;
import br.com.aluno.entity.Usuario;
import br.com.aluno.util.JsfUtil;
@ManagedBean
public class LoginMB implements Serializable {
private static final long serialVersionUID = 6667329439219329074L;
private Usuario usuario;
@PostConstruct
public void init() {
usuario = new Usuario();
}
public void logar() {
try {
Collection<Usuario> usuarios = DaoFactory
.getDAOFactory(DaoFactory.JPA).getUsuarioDao()
.validarLogin(usuario);
if (usuarios != null && usuarios.size() == 1) {
usuario = usuarios.iterator().next();
HttpSession session = (HttpSession) FacesContext
.getCurrentInstance().getExternalContext()
.getSession(true);
if (session != null) {
session.setAttribute("usuario", usuario);
session.setAttribute("usuarioTipo", usuario.getClass()
.getName());
}
} else {
JsfUtil.addErrorMessage("Login ou senha invalida",
"Login ou senha invalida");
}
} catch (Exception e) {
JsfUtil.addFatalMessage("Entre em contato com o administrador",
e.getMessage());
}
}
public String logout() {
HttpSession session = (HttpSession) FacesContext.getCurrentInstance()
.getExternalContext().getSession(false);
if (session != null) {
session.invalidate();
}
return "/login?faces-redirect=true";
}
public Usuario getUsuario() {
return usuario;
}
public void setUsuario(Usuario usuario) {
this.usuario = usuario;
}
}
我在 index.html 中有一个链接，它重定向到以下 login.xhtml：
<ui:decorate xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui" template="/aluno_jsf.xhtml">
<ui:define name="conteudo">
<h:form rendered="#{sessionScope.usuario == null}">
<h3>Login</h3>
<p:messages id="messages" showDetail="true" autoUpdate="true" />
<h:panelGrid columns="2">
<p:outputLabel for="login" value="Login:" />
<p:inputText id="login" value="#{loginMB.usuario.login}" required="true"
requiredMessage="Digite um login" />
<p:outputLabel for="senha" value="Senha:" />
<p:password id="senha" value="#{loginMB.usuario.senha}" required="true"
requiredMessage="Digite uma senha" />
<p:commandButton action="#{loginMB.logar}" value="Logar" ajax="false" />
</h:panelGrid>
</h:form>
</ui:define>
验证后，应呈现以下页面：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui" >
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>aluno_jsf</title>
</h:head>
<h:body>
<f:view>
<h:form>
<p:menubar
rendered="#{sessionScope.usuarioTipo == 'br.com.aluno.entity.Administrador'}">
<p:menuitem url="/administrador/cadastroCurso.xhtml"
value="Cadastro de curso" />
<p:menuitem url="/administrador/cadastroDisciplina.xhtml"
value="Cadastro de disciplinas" />
<p:menuitem url="/administrador/cadastroAluno.xhtml"
value="Cadastro de alunos" />
<p:menuitem url="/administrador/atribuiNota.xhtml"
value="Atribuicao de notas para alunos" />
<p:menuitem action="#{loginMB.logout}" value="Logout" />
</p:menubar>
<p:menubar
rendered="#{sessionScope.usuarioTipo == 'br.com.aluno.entity.Aluno'}">
<p:menuitem url="/aluno/nota.xhtml" value="Consulta de notas" />
<p:menuitem url="/aluno/senha.xhtml" value="Alteracao de senha" />
<p:menuitem action="#{loginMB.logout}" value="Logout" />
</p:menubar>
</h:form>
<ui:insert name="conteudo">
conteudo
</ui:insert>
</f:view>
</h:body>
</html>
由于我正在调整这个网络应用程序 - 而且我之前已经有一些错误配置 - 有人知道现在发生了什么吗？
提前致谢。
正如你所问，她是新的例外：
message Could not initialize class br.com.fiap.aluno.util.JpaUtil
description The server encountered an internal error (Could not initialize class br.com.fiap.aluno.util.JpaUtil) that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Could not initialize class br.com.fiap.aluno.util.JpaUtil
javax.faces.webapp.FacesServlet.service(FacesServlet.java:422)
root cause
java.lang.NoClassDefFoundError: Could not initialize class br.com.fiap.aluno.util.JpaUtil
br.com.fiap.aluno.dao_jpa.JpaUsuarioDao.validarLogin(JpaUsuarioDao.java:46)
br.com.fiap.aluno.controller.LoginMB.logar(LoginMB.java:30)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
javax.el.BeanELResolver.invoke(BeanELResolver.java:484)
javax.el.CompositeELResolver.invoke(CompositeELResolver.java:161)
org.apache.el.parser.AstValue.getValue(AstValue.java:159)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
com.sun.faces.facelets.el.ELText$ELTextVariable.toString(ELText.java:214)
com.sun.faces.facelets.compiler.AttributeInstruction.write(AttributeInstruction.java:89)
com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:302)
com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1756)
javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1756)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.29 logs.
我会尝试修复它，但如果您能提供一些提示，我将不胜感激。