request scoped property in session scoped JSF bean

问题:

I would like to have a session scoped JSF bean with one property that is request (page) scoped. Is it possible at all?

回答1:

No, that's not possible. Managed property injection only happens during creation of the bean. However, when a session scoped bean is been created there is not necessarily a request present and the injected request scoped bean would be invalid in subsequent requests in the remnant of the session.

Do it the other way round. E.g.

@ManagedBean
@SessionScoped
public class UserManager {

    private User current;

    // ...
}

and

@ManagedBean
@RequestScoped
public class Login {

    private String username;
    private String password;

    @ManagedProperty(value="#{userManager}")
    private UserManager userManager;

    @EJB
    private UserService userService;

    public String submit() {
        User user = userService.find(username, password);

        if (user != null) {
            userManager.setCurrent(user);
            return "home?faces-redirect=true";
        } else {
            addErrorMessage("Unknown login, please try again");
            return null;
        }
    }

    // ...
}