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

1. You have created a JSP that includes instance variables and a great deal of scriptlet code.
Unfortunately, after extensive load testing, you have discovered several race conditions in your JSP scriptlet code. To fix these problems would require significant recoding, but you are already behind schedule. Which JSP code snippet can you use to resolve these concurrency problems?

A) <%! implements SingleThreadModel %>
B) <%@ page implements='SingleThreadModel' %>
C) <%@ page isThreadSafe='false' %>
D) <%@ implements SingleThreadModel %>
E) <%@ page useSingleThreadModel='true' %>

2. Given:
6. <% int[] nums = {42, 420, 4200};
7. request.setAttribute("foo", nums); %>
Which two successfully translate and result in a value of true? (Choose two.)

A) ${requestScope['foo'][1] = 420}
B) ${(requestScope['foo'][0] lt 50) && (3 gt 2)}
C) ${true or false}
D) ${requestScope[foo][0] > 500}

3. Which two about WAR files are true? (Choose two.)

A) The web container must serve the content of any META-INF directory located in a WAR file.
B) The web container must allow access to resources in JARs in the web application library directory.
C) WAR files must be created by using archive tools designed specifically for that purpose.
D) WAR files must be located in the web application library directory.
E) WAR files must contain the web application deployment descriptor.

4. A developer is designing a web application which extensively uses EJBs and JMS. The developer finds that there is a lot of duplicated code to build the JNDI contexts to access the beans and queues. Further, because of the complexity, there are numerous errors in the code. Which J2EE design pattern provides a solution for this problem?

A) Session Facade
B) Business Delegate
C) Command
D) Service Locator
E) Transfer Object
F) Data Access Object

5. Which statement is true about web container session management?

A) To activate URL rewriting, the developer must use the
HttpServletResponse.setURLRewriting method.
B) The JSESSIONID cookie is stored permanently on the client so that a user may return to the web application and the web container will rejoin that session.
C) If the web application uses HTTPS, then the web container may use the data on the
HTTPS request stream to identify the client.
D) Access to session-scoped attributes is guaranteed to be thread-safe by the web container.

Solutions: