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

1. A developer is designing a web application that must verify for each request:
The originating request is from a trusted network.
The client has a valid session.
The client has been authenticated.
Which design pattern provides a solution in this situation?

A) Model-View-Controller
B) Session Facade
C) Intercepting Filter
D) Template Method
E) Transfer Object

2. Given the definition of MyObject and that an instance of MyObject is bound as a session attribute:
8 . package com.example;
9 . public class MyObject implements
1 0. javax.servlet.http.HttpSessionBindingListener {
1 1. // class body code here
12. }
Which is true?

A) Only a single instance of MyObject may exist within a session.
B) The com.example.MyObject must be declared as a servlet event listener in the web application deployment descriptor.
C) The valueUnbound method of the MyObject instance is called when the session to which it is bound times out.
D) The unbound method of the MyObject instance is called when the session to which it is bound times out.

3. Your company has a corporate policy that prohibits storing a customer's credit card number in any corporate database. However, users have complained that they do NOT want to re- enter their credit card number for each transaction. Your management has decided to use client-side cookies to record the user's credit card number for 120 days. Furthermore, they also want to protect this information during transit from the web browser to the web container; so the cookie must only be transmitted over HTTPS. Which code snippet creates the "creditCard" cookie and adds it to the out going response to be stored on the user's web browser?

A) 10. Cookie c = new Cookie("creditCard", usersCard);
1 1. c.setHttps(true);
1 2. c.setAge(10368000);
1 3. response.addCookie(c);
B) 10. Cookie c = new Cookie("creditCard", usersCard);
1 1. c.setHttps(true);
1 2. c.setMaxAge(10368000);
1 3. response.setCookie(c);
C) 10. Cookie c = new Cookie("creditCard", usersCard);
1 1. c.setSecure(true);
1 2. c.setAge(10368000);
1 3. response.setCookie(c);
D) 10. Cookie c = new Cookie("creditCard", usersCard);
1 1. c.setSecure(true);
1 2. c.setMaxAge(10368000);
1 3. response.addCookie(c);
E) 10. Cookie c = new Cookie("creditCard", usersCard);
1 1. c.setSecure(true);
1 2. c.setAge(10368000);
1 3. response.addCookie(c);

4. For manageability purposes, you have been told to add a "count" instance variable to a critical JSP Document so that a JMX MBean can track how frequent this JSP is being invoked. Which JSP code snippet must you use to declare this instance variable in the JSP
Document?

A) <%! int count = 0; %>
B) <jsp:declaration>
int count = 0;
< jsp:declaration>
C) <jsp:scriptlet.declaration>
int count = 0;
< jsp:scriptlet.declaration>
D) <jsp:declaration.instance>
int count = 0;
< jsp:declaration.instance>

5. A developer is designing the presentation tier for a web application which requires a centralized request handling to complete common processing required by each request.
Which design pattern provides a solution to this problem?

A) Data Access Object
B) Intercepting Filter
C) Front Controller
D) Business Delegate
E) Service Activator
F) Remote Proxy

Solutions: