注销失败后重定向，并出现java.lang.IllegalStateException:提交响应后无法创建会话 [英] Redirect after logout fails with java.lang.IllegalStateException: Cannot create a session after the response has been committed

问题描述

我有一个JSF2应用程序.我有一个会话范围内的登录bean和一个视图范围内的注销bean.登录时，我使用重定向，它可以正常工作.但是，注销失败并重定向.如果我注销但未重定向，则可以正常工作.

I have a JSF2 application. I have a login bean which is session scoped and a logout bean which is view scoped. When I login I use redirect and it works fine. However the logout fails with redirect. If I logout without redirect it works.

@ManagedBean
@ViewScoped
public class MbLogout extends BaseJsf {
    private static final long serialVersionUID = 2992671241358926373L;

    public String logout() throws DfException {
        getFacesContext().getExternalContext().invalidateSession();

        //return "login?faces-redirect=true"; // fails with this
        return "login";
    }
}

登录页面具有到登录bean的绑定，所以我怀疑这可能与登录bean有关，尽管我不知道为什么它不起作用.错误是:

The login page has bindings to the login bean so I suspect this may have something to do with it, although I don't see why it doesn't work. The error is:

java.lang.IllegalStateException: Cannot create a session after the response has been committed

我的猜测是，自从我访问会话bean以来，它正在尝试在登录页面上创建会话，尽管我没有发现任何问题，并且无需重定向即可运行.

My guess is it's trying to create a session on the login page since I access the session bean although I don't see anything wrong with this and it works without redirect.

我正在使用MyFaces 2.1.

I'm using MyFaces 2.1.

推荐答案

我建议使用Servlet而不是bean进行注销，托管bean(尤其是视图作用域)不适合注销.例如:

I would recommend using a Servlet rather than a bean for logout, a managed bean (especially view scoped) is not fitting for the purpose of logging out. For example:

@WebServlet(name = "LogoutServlet", urlPatterns = {"/logout"}) // Can be configured in web.xml aswell
public class LogoutServlet extends HttpServlet {

    private static final String redirectURL = "http://www.somepage.com";

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Destroys the session for this user.
        if (request.getSession(false) != null) {
            request.getSession(false).invalidate();
            }
        response.sendRedirect(redirectURL );
    }
}

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