How to access JSF application-scoped managed beans from an HttpSessionListener?

Question

I am running a JSF application and have declared some application-scoped backing beans (either in common-beans.xml or using the @ManagedBean and @ApplicationScoped annotations).

How can I access these beans from inside a javax.servlet.http.HttpSessionListener ?

I understand that the FacesContext is not available in the session listener so using:

public class AnHTTPSessionListener implements HttpSessionListener {
    ...
    public void sessionDestroyed(HttpSessionEvent e) {
        AppBean appBean = (AppBean) FacesContext.getCurrentInstance()
                                                .getExternalContext()
                                                .getApplicationMap().get("appBean")
       ...
    }

... threw a NPE as expected.

UPDATE:

(before BalusC answer)

What I ended up doing was declare the application-wide information I needed to access in web.xml using env-entry elements (instead of using application-scoped beans) and then retrieve that information using:

   InitialContext ic = new InitialContext();
   Context env = (Context) ic.lookup("java:comp/env");
   appName = (String) env.lookup("appBeanValue");

It's not what I had in mind but it's a workaround.

score 9 · Accepted Answer · edited May 23 '17 at 10:29

JSF stores application scoped managed beans as attributes of the ServletContext.

So, this should do:

public void sessionDestroyed(HttpSessionEvent e) {
    AppBean appBean = (AppBean) e.getSession().getServletContext().getAttribute("appBean");
    // ...
}

How to access JSF application-scoped managed beans from an HttpSessionListener?

UPDATE:

1 Answers1

See also:

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