Don't understand Final Mock Exam #22, 55

[Hong Anderson]

Question 22: Which JSP code would you use to include static content in a JSP?

D. RequestDispatcher dispatcher
= request.getRequestDispatcher("/segments/footer.html");
dispatcher.include(request,response);

Why option D is not correct?

Question 55:
What happen when the following code?

   req.getSession().setAttribute("key", new X());
   req.getSession().setAttribute("key", new X());
   req.getSession().setAttribute("key", "x");
   req.getSession().removeAttribute("key");

listener class

public class X implements HttpSessionBindingListener
{
   public void valueBound(HttpSessionBindingEvent event) {
      System.out.print("B");
   }
 
   public void valueUnbound(HttpSessionBindingEvent event) {
      System.out.print("UB");
   }
}
  

Any one who understand please explain me, thank you.

[Lloyd Lane]

As far as q.55 there's a good thread discussing it
here

[Hong Anderson]

Thank you.
[ November 24, 2005: Message edited by: Kengkaj Sathianpantarit ]