CODEWITHSUNDEEP
jsfsessionnullpointerexceptioncdisession-scope
xi.lin
xi.lin

Reputation: 3414

JSF injected sessionscoped bean's method invocation become null pointer

I use CDI to annotate beans. One bean called SessionManager holds the logined user information with the declaration:

import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
import javax.ejb.Stateful;

@Stateful
@Named
@SessionScoped
public class SessionManagerImpl implements SessionManager, Serializable {
    ...
    public UserDto getLoginedUser() {
        ...
    }
}

And the other is called DashboardController as:

import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import javax.inject.Inject;

@Named
@RequestScoped
public class DashboardController implements Serializable {

    @Inject
    private SessionManager sessionManager;
    ...
    public void loadUserInfo() {
        ...
        UserDto userDto = sessionManager.getLoginedUser();
    }
}

The first time i open a page refer DashboardController, it works well. And if i continue to use the website, it still works. But if i don't click any page for some minutes, and come back to open the page, it will display a null pointer for the javassist$$getLoginedUser method invocation (sessionManager is not null when i use debug to watch). The session is still valid for i can get values from session map directly using faces context.

What's wrong with the SessionManager? Thanks.

Upvotes: 0

Views: 736

Answers (1)

John Ament
John Ament

Reputation: 11723

This occurs because your Stateful Session Bean (EJB) has passivated, and is not reintroduced to your session. If there isn't a strong need to make your session scoped object a session bean, I would just make it a SessionScoped managed bean.

Upvotes: 1

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