Which of the following implicit objects is not available to a JSP page by default?
A. application
B. session
C. exception
D. config


public class TestServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res)
{
private HttpSession session = req.getSession();
private ServletContext ctx = getServletContext();
}
}
Which of the variables used in the above servlet reference objects that are thread safe?
A. req
B. res
C. session
D. ctx

answer is A and D ....

i am a little confused becoz worked in J2EE a long time before, so dats why i am replying so to indulge in discussion with you and in dat way i will remember J2EE......i will make my answer confirm too....

Hi, only "exception" object is not avaible by default. All others are avaible.
I am not good at multi-threading so i can not answer to your second question

C. The "exception" object is available only in an exception page, one with "error = true" attribute in <@page>

A, B, C are thread safe because are specific to each user.
D is shared for all the users.