SUN 310-083 real exam prep : Sun Certified Web Component Developer for J2EE 5

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SUN 310-083 Exam Syllabus Topics:

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

1. You need to create a JavaBean object that is used only within the current JSP page. It must NOT be accessible to any other page including those that this page might import.
Which JSP standard action can accomplish this goal?

A) <jsp:makeBean id='pageBean' type='com.example.MyBean' />
B) <jsp:useBean id='pageBean' class='com.example.MyBean' />
C) <jsp:makeBean name='pageBean' class='com.example.MyBean' />
D) <jsp:useBean id='pageBean' type='com.example.MyBean' />
E) <jsp:useBean name='pageBean' class='com.example.MyBean' />
F) <jsp:makeBean id='pageBean' class='com.example.MyBean' />

2. A developer is designing a web application that must support multiple interfaces, including:
an XML web service for B2B
HTML for web-based clients
WML for wireless customers
Which design pattern provides a solution for this problem?

A) Data Access Object
B) Session Facade
C) Business Delegate
D) Chain of Responsibility
E) Model-View-Controller

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

4. Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.service method:
20. String key = "com.example.data";
21. session.setAttribute(key, "Hello");
22. Object value = session.getAttribute(key);
23.
Assume session is an HttpSession, and is not referenced anywhere else in ServletA.
Which two changes, taken together, ensure that value is equal to "Hello" on line 23?
(Choose two.)

A) ensure that the ServletB.service method is synchronized
B) enclose lines 21-22 in a synchronized block:
synchronized(this) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
C) ensure that ServletB synchronizes on the session object when setting session attributes
D) enclose lines 21-22 in a synchronized block:
synchronized(session) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
E) ensure that the ServletA.service method is synchronized

5. Which two directives are applicable only to tag files? (Choose two.)

A) include
B) taglib
C) variable
D) tag
E) page

Solutions: