Injecting FacesContext with CDI - jsf

Question

I have my Bean:
import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.inject.Named;
import javax.persistence.EntityManager;
import br.com.dropper.web.dao.UsuarioDAO;
import br.com.dropper.web.model.Usuario;
import br.com.dropper.web.util.JpaUtil;
#Named
#SessionScoped
public class LoginBean implements Serializable {
private static final long serialVersionUID = 1L;
#Inject
private FacesContext context;
#Inject
private Usuario usuario;
//TODO: Persistencia e Transacao controladas por EJB
private EntityManager em = new JpaUtil().getEntityManager();
private UsuarioDAO usuarioDAO = new UsuarioDAO(em);
public Usuario getUsuario() {
return usuario;
}
public String autenticar() {
Usuario usuario = usuarioDAO.obterUsuarioPorEmail(this.usuario);
if (usuario == null) {
context.addMessage(null, new FacesMessage("Usuario não encontrado."));
context.getExternalContext().getFlash().setKeepMessages(true);
return "login?faces-redirect=true";
} else {
context.getExternalContext().getSessionMap().put("usuarioLogado", usuario);
return "dashboardImagem.xhtml?faces-redirect=true";
}
}
public String cadastrarUsuario() {
System.out.println("Redirecionando para cadastroUsuario.xhtml");
return "cadastroUsuario.xhtml?faces-redirect=true";
}
public String logout() {
context.getExternalContext().getSessionMap().remove("usuarioLogado");
context.getExternalContext().invalidateSession();
return "login.xhtml?faces-redirect=true";
}
}
And my Factory:
package br.com.dropper.web.factory;
import java.io.Serializable;
import javax.enterprise.inject.Produces;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;
public class FacesContextFactory implements Serializable{
private static final long serialVersionUID = 1L;
#Produces
#ViewScoped
public FacesContext getFacesContext(){
return FacesContext.getCurrentInstance();
}
}
When i run my application, im getting this exception:
Caused by: org.jboss.weld.exceptions.IllegalProductException: WELD-000053: Producers cannot declare passivating scope and return a non-serializable class: Producer for Producer Method [FacesContext] with qualifiers [#Any #Default] declared as [[BackedAnnotatedMethod] #Produces #ViewScoped public br.com.dropper.web.factory.FacesContextFactory.getFacesContext()] declared on Managed Bean [class br.com.dropper.web.factory.FacesContextFactory] with qualifiers [#Any #Default]
at br.com.dropper.web.factory.FacesContextFactory.getFacesContext(FacesContextFactory.java:16)
And when i change the produces method to #RequestScoped, my FacesContext it's inject only one time, and in my second page xhtml, i get a nullpointer =(
UPDATE: pom
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>br.com.dropper</groupId>
<artifactId>dropper-web</artifactId>
<version>0.1</version>
<packaging>war</packaging>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<scope>provided</scope>
</dependency>
<!-- <dependency>
<groupId>dropper-web</groupId>
<artifactId>postgresql</artifactId>
<version>9.4.1212</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/postgresql-9.4.1212.jre6.jar</systemPath>
</dependency> -->
<dependency>
<groupId>dropper-web</groupId>
<artifactId>bootstrap</artifactId>
<version>1.0.10</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/bootstrap-1.0.10.jar</systemPath>
</dependency>
<dependency>
<groupId>dropper-web</groupId>
<artifactId>commons-io</artifactId>
<version>2.5</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/commons-io-2.5.jar</systemPath>
</dependency>
<dependency>
<groupId>dropper-web</groupId>
<artifactId>cupertino</artifactId>
<version>1.0.10</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/cupertino-1.0.10.jar</systemPath>
</dependency>
<dependency>
<groupId>dropper-web</groupId>
<artifactId>primefaces-6.0</artifactId>
<version>6.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/src/main/webapp/WEB-INF/lib/primefaces-6.0.jar</systemPath>
</dependency>
</dependencies>
<build>
<finalName>dropper-web</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
Att

Answer 1

The FacesContext itself is indeed not Serializable. And, more important, it is definitely not #ViewScoped. It's actually shorter than #RequestScoped, but until JSF 2.3 is released which comes with improved CDI support so you could just #Inject FacesContext without having a custom producer, you could less or more safely use #Produces #RequestScoped instead.
#Produces
#RequestScoped
public FacesContext getFacesContext(){
return FacesContext.getCurrentInstance();
}
One case where this would still fail is when you explicitly perform a forward within the same request using RequestDispatcher#forward() or ExternalContext#dispatch(). You will then face java.lang.IllegalStateException at com.sun.faces.context.FacesContextImpl.assertNotReleased. This is however a very rare case and usually only performed in a badly designed (ajax) exception handler. See also a.o. using ExternalContext.dispatch in JSF error handler causes corrupt page rendering.