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

1. You are designing an n-tier Java EE application. You have already decided that some of your JSPs will need to get data from a Customer entity bean. You are trying to decide whether to use a Customer stub object or a Transfer Object. Which two statements are true? (Choose two.)

A) The Transfer Object will decrease data staleness.
B) The stub will increase network traffic.
C) The stub will increase the logic necessary in the JSPs.
D) Only the Transfer Object will need to use a Business Delegate.
E) In both cases, the JSPs can use EL expressions to get data.
F) Using the stub approach allows you to design the application without using a Service
Locator.

2. Every page of your web site must include a common set of navigation menus at the top of the page. This menu is static HTML and changes frequently, so you have decided to use
JSP's static import mechanism. Which JSP code snippet accomplishes this goal?

A) <%@ page include='/common/menu.html' %>
B) <%@ import file='/common/menu.html' %>
C) <%@ include file='/common/menu.html' %>
D) <%@ import page='/common/menu.html' %>
E) <%@ page import='/common/menu.html' %>
F) <%@ include page='/common/menu.html' %>

3. You have created a servlet that generates weather maps. The data for these maps is calculated by a remote host. The IP address of this host is usually stable, but occasionally does have to change as the corporate network grows and changes. This IP address used to be hard coded, but after the fifth change to the IP address in two years, you have decided that this value should be declared in the deployment descriptor so you do NOT have the recompile the web application every time the IP address changes. Which deployment descriptor snippet accomplishes this goal?

A) <serlvet-param>
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /servlet-param>
B) <init-param>
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /init-param>
C) <init-param>
< name>WeatherServlet.hostIP</name>
< value>127.0.4.20</value>
< /init-param>
D) <serlvet-param>
< name>WeatherServlet.hostIP</name>
< value>127.0.4.20</value>
< /servlet-param>
E) <servlet>
< !-- servlet definition here -->
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /servlet>

4. The Squeaky Bean company has decided to port their web application to a new J2EE 1.4 container. While reviewing the application, a developer realizes that in multiple places within the current application, nearly duplicate code exists that finds enterprise beans.
Which pattern should be used to eliminate this duplicate code?

A) Business Delegate
B) Model-View-Controller
C) Intercepting Filter
D) Service Locator
E) Front Controller
F) Transfer Object

5. You have a use case in your web application that adds several session-scoped attributes.
At the end of the use case, one of these objects, the manager attribute, is removed and then it needs to decide which of the other session-scoped attributes to remove.
How can this goal be accomplished?

A) The object of the manager attribute should implement the HttpSessionBindingListener and it should call the removeAttribute method on the appropriate session attributes.
B) The object of the manager attribute should implement the HttpSessionListener and it should call the removeAttribute method on the appropriate session attributes.
C) The object of the manager attribute should implement the HttpSessionBindingListener and it should call the deleteAttribute method on the appropriate session attributes.
D) The object of the manager attribute should implement the HttpSessionListener and it should call the deleteAttribute method on the appropriate session attributes.

Solutions: