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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. A developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in a thread-safe manner. Which two can support this design goal? (Choose two.)

A) Store the data in an instance variable.
B) Store the data in the HttpSession object.
C) Store the data in the ServletContext object.
D) Store the data in a local variable.
E) Store the data in the ServletRequest object.

2. Which activity supports the data integrity requirements of an application?

A) using an LDAP security realm
B) using HTTPS as a protocol
C) using forms-based authentication
D) using HTTP Basic authentication

3. Given that a scoped attribute cart exists only in a user's session, which two, taken independently, ensure the scoped attribute cart no longer exists? (Choose two.)

A) <c:remove scope="session">cart</c:remove>
B) <c:remove var="${cart}" scope="session" />
C) <c:remove var="cart" />
D) <c:remove scope="session">${cart}</c:remove>
E) ${cart = null}
F) <c:remove var="${cart}" />
G) <c:remove var="cart" scope="session" />

4. As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionID. In addition, assume that your webapp keeps a hashmap of session objects by the ID. Here is a partial implementation of this servlet:
10. public class SessionAgeServlet extends HttpServlet {
11. public void service(HttpServletRequest request, HttpServletResponse) throws
IOException {
1 2. String sessionID = request.getParameter("sessionID");
1 3. HttpSession session = getSession(sessionID);
1 4. long age = // your code here
1 5. response.getWriter().print(age);
1 6. }
... // more code here
4 7. }
Which code snippet on line 14, will determine the age of the session?

A) session.getMaxInactiveInterval() - session.getCreationTime();
B) session.getLastAccessed().getTime() - session.getCreationTime().getTime();
C) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime();
D) session.getLastAccessed() - session.getCreationTime();
E) session.getMaxInactiveInterval();
F) session.getLastAccessedTime() - session.getCreationTime();

5. Click the Exhibit button.
A session-scoped attribute, product, is stored by a servlet. That servlet then forwards to a
JSP page. This attribute holds an instance of the com.example.Product class with a name property of "The Matrix" and price property of 39.95.
Given the JSP page code snippet:
1 . <jsp:useBean id='product' class='com.example.Product'>
2 . <jsp:setProperty name='product' property='price' value='49.95'/>
3 . </jsp:useBean>
4 . <%= product.getName() %> costs <%= product.getPrice() %>
What is the response output of this JSP page code snippet?

A) Default costs 49.95
B) The Matrix costs 49.95
C) Default costs 39.95
D) Default costs 0.0
E) The Matrix costs 0.0
F) The Matrix costs 39.95

Solutions: