Optional.orElse failure

gistfile1.java

class Session {
    public String getCustomerName() {
        // Some checks and throws exception if session not started
        throw new SessionNotStartedException();
    }
    
    public static Session getCurrentSession() {
        return new Session();
    }
}

public class App {
    public static void main(String[] args) {
        Application application = new Application(); // coming as function parameter
        Session session = Session.getCurrentSession();
        String customerName = Optional.ofNullable(application)
                              .map(Application::getCustomerName)
                              .orElse(session.getCustomerName());
    }
}