Error redirecting to a jsf page inside a bean

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(SOLVED) Error redirecting to a jsf page within a Managerbean. I have an application in Java EE, and I want to validate inside the Loginbean constructor (Viewscope) to redirect to my main page if there is already an open and valid session for that browser.

I can recover the session, I check if it is valid successfully, but I can’t redirect before opening the login screen.

The following error is returned:

Cannot call sendRedirect() after the response has been committed

Bean code

@ManagedBean
@ViewScoped
public class LoginBean implements Serializable {

    private static final long serialVersionUID = 3654371476703737165L;

    public String testarSessaoLogada() throws IOException {
        HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
        HttpSession session = request.getSession(true);

        LoginControle loginControle = (LoginControle) session.getAttribute("loginControle");

        if (loginControle.getControleSessaoBean() != null && session != null) {
            SessaoLogada sessaoLogada = loginControle.getControleSessaoBean().buscarSessaoLogada(session.getId());
            if (sessaoLogada != null) {
                if (sessaoLogada.getUsuario().getTipo().equals("Cliente")) {
                    FuncoesUtils.redirect("");
                } else {
                    try {
                        FacesContext.getCurrentInstance().getExternalContext().redirect("privado/controle.jsf");
                    } catch (Exception e) {
                        try {
                            FacesContext.getCurrentInstance().getExternalContext().redirect("privado/controle.jsf");
                        } catch (IOException ex) {
                            Logger.getLogger(LoginBean.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                }
            }
        }
        return "";
    }
}

On the login.html page you have the following code that has the functionality to load the function that tests whether there is already a logged in session for that browser...

The error occurs precisely when trying to redirect 

FacesContext.getCurrentInstance().getExternalContext().redirect("privado/controle.jsf");

I needed to discover the error or even a hint to make this redirection otherwise.... Thank you very much.

Resolution:

https://stackoverflow.com/questions/8399045/conditional-redirection-in-jsf

Just instead of loading the function on a screen component I loaded it on before h:body.

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core">
    <h:head>
       ...
    </h:head>
    <f:event type="preRenderView" listener="#{loginBean.testarSessaoLogada()}" />
    <h:body>
        ...

Thanks to all who helped me...

jsf filter redirect

1 answer

1

If the call is being made through a actionListner or a action, in the method itself you can return a string with the value private/control.jsf, if necessary a redirect get to update the URL private/control.jsf? faces-redirect=true

public String testarSessaoLogada() throws IOException {
    HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
    HttpSession session = request.getSession(true);

    LoginControle loginControle = (LoginControle) session.getAttribute("loginControle");

    if (loginControle.getControleSessaoBean() != null && session != null) {
        SessaoLogada sessaoLogada = loginControle.getControleSessaoBean().buscarSessaoLogada(session.getId());
        return isClienteLogado(sessaoLogada) ? "" : "privado/controle.jsf";
    }

    return "";
}

private boolean isClienteLogado(SessaoLogada sessao){
    return sessao != null && sessao.getUsuario().getTipo().equals("Cliente");
}

  • thanks for the @Otávio reply , but the problem that wanted to call this action when rendering the page, I tried to put the same function in the constructor...but the error also persisted... the goal is to check before loading the login, check if there is a logged-in session in the browser and redirect to the control page. Then I only load the login if there is no logged in session in the browser.

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