In my webapp, when I click on the login link, the Tomcat webserver throws

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Asked: June 8, 20262026-06-08T10:01:07+00:00 2026-06-08T10:01:07+00:00

In my webapp, when I click on the login link, the Tomcat webserver throws

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In my webapp, when I click on the login link, the Tomcat webserver throws the following exception:

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
[...]

Here’s my @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;
}
}

I have a link in a index.html which redirects to the following 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>

After validation, the following pages should be rendered:

<!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>

Since I’m adapting this web app – and I’ve already got some misconfigurations before – does anyone knows what’s happening now?

Thanks in advance.

As you asked, her’s the new exception:

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.

I’ll try to fix it, but I appreciate if you could give some hints.

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1 Answer

Editorial Team · Answer 1 · 2026-06-08T10:01:09+00:00

javax.el.ELException: /aluno_jsf.xhtml: Property ‘logout’ not found on type
br.com.aluno.controller.LoginMB

This suggests that the #{loginMB.logout} is been evaluated as a ValueExpression instead of as a MethodExpression.

That can for example happen if you’re using <h:outputText value="#{loginMB.logout}" />, or even when the x namespace behind <x:someComponent action="#{loginMB.logout}" /> can’t be resolved due to missing or incorrect XML namespace declaration or the JAR file containing the components not being included in the runtime classpath.

The cause is not visible in the code posted so far, but with my best guess you’re not using Facelets templating properly. The code shows strange use case of <ui:decorate>. Head to this answer to learn how to properly use template compositions: How to include another XHTML in XHTML using JSF 2.0 Facelets?

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