JBridge: Certification Question Of The Day

Identify the correct listener interface methods which potentially would be triggered by running the following servlet code, and the order in which they would trigger. Assume that MyListeningObject implements an appropriate listener for objects being bound or unbound from a session. Assume also that web.xml has a listener class set up that has an interest in session attributes.

protected void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
  MyListeningObject mlo = new MyListeningObject();
  HttpSession session = request.getSession();
  session.setAttribute("MyAttribute", mlo);
}

The Answer

The correct answer is C.
Order does matter. Answer D reverses the correct order, and slips in a non-existent event type (HttpSessionAttributeEvent: nah. It's HttpSessonBindingEvent that gets passed to the methods in both types of listener).
In answers A and B, HttpSessionObjectListener and its attendant method and parameter are works of fiction.
In answer E, HttpSessionListener is a valid interface - but has no relevance here. It doesn't have a valueBound method; it has to do with the creation and destruction of the session itself, not its attributes.