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

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

2. Which two are characteristics of the Service Locator pattern? (Choose two.)

A) It increases source code duplication and decreases reuse.
B) It encapsulates component lookup procedures.
C) It improves client performance by caching context and factory objects.
D) It degrades network performance due to increased access to distributed lookup services.

3. Which element of the web application deployment descriptor defines the servlet class associated with a servlet instance?

A) <servlet-mapping>
B) <webapp>
C) <servlet>
D) <codebase>
E) <class>
F) <servlet-class>

4. You have a simple web application that has a single Front Controller servlet that dispatches to JSPs to generate a variety of views. Several of these views require further database processing to retrieve the necessary order object using the orderID request parameter. To do this additional processing, you pass the request first to a servlet that is mapped to the
URL pattern /WEB-INF/retreiveOrder.do in the deployment descriptor. This servlet takes two request parameters, the orderID and the jspURL. It handles the database calls to retrieve and build the complex order objects and then it dispatches to the jspURL.
Which code snippet in the Front Controller servlet dispatches the request to the order retrieval servlet?

A) String T="/WEB-INF/retreiveOrder.do?orderID=%d&jspURL=%s";
String url = String.format(T, orderID, jspURL);
Dispatcher view
= context.getDispatcher(url);
view.forwardRequest(request, response);
B) String T="/WEB-INF/retreiveOrder.do?orderID=%d&jspURL=%s";
String url = String.format(T, orderID, jspURL);
RequestDispatcher view
= context.getRequestDispatcher(url);
view.forward(request, response);
C) request.setParameter("orderID", orderID);
request.setParameter("jspURL", jspURL);
Dispatcher view
= request.getDispatcher("/WEB-INF/retreiveOrder.do");
view.forwardRequest(request, response);
D) request.setAttribute("orderID", orderID);
request.setAttribute("jspURL", jspURL);
RequestDispatcher view
= context.getRequestDispatcher("/WEB-INF/retreiveOrder.do");
view.forward(request, response);

5. Given:
1 . package com.example;
2 .
3 . public abstract class AbstractItem {
4 . private String name;
...
13. }
Assume a concrete class com.example.ConcreteItem extends com.example.AbstractItem.
A servlet sets a session-scoped attribute called "item" that is an instance of com.example.ConcreteItem and then forwards to a JSP page.
Which two are valid standard action invocations that expose a scripting variable to the JSP page? (Choose two.)

A) <jsp:useBean id="item" class="com.example.ConcreteItem"
scope="session" />
B) <jsp:useBean id="com.example.ConcreteItem"
scope="session" />
C) <jsp:useBean id="item" type="com.example.ConcreteItem"
class="com.example.AbstractItem"
scope="session" />
D) <jsp:useBean id="item" type="com.example.ConcreteItem"
scope="session" />

Solutions: