How do I get and set an object in session scope in JSF?

Question

I need to persist just one object in session scope of my JSF application. Where do I define a session variable, and how do I get and set it from either a view file or backin

Answer 1

When you call the method FacesContext.getCurrentInstance() it will return the current thread but in case of P.S.V.M there will be no thread running in application context. So you get a NPE.

Better use something like this:

public String checker() {
    SessionFactory factory = HibernateUtil.getSessionFactory();
    Session session = factory.getCurrentSession();
    session.beginTransaction();
    Query q = session.createQuery("from UserLogin where UserId='"
            + uid.getUserId() + "'and Pswd='" + uid.getPswd()
            + "'and RoleId='" + uid.getRoleId() + "'");
    setUid((UserLogin) q.uniqueResult());

    System.out.println("upto here every thing is workind properly");

    if (uid != null) {
        FacesContext context = FacesContext.getCurrentInstance();

        HttpServletRequestrequest = (HttpServletRequest) context
                .getExternalContext().getRequest();
        HttpSession appsession = request.getSession(true);

        if (appsession.isNew() == false) {
            appsession.invalidate();
            appsession = request.getSession(true);
        }
        context.getExternalContext().getSessionMap().put("userbean", uid);
        session.close();
        return uid.getRoleId();
    } else
        return "invalid";
}

and put it into a session bean. You can use the code to validate users.