Oracle 1Z0-858 問題集

質問 1：
In a JSP-centric web application, you need to create a catalog browsing JSP page. The catalog is stored as a List object in the catalog attribute of the webapp's ServletContext object. Which scriptlet code snippet gives you access to the catalog object?
A. <% List catalog = servletContext.getAttribute("catalog"); %>
B. <% List catalog = application.getAttribute("catalog"); %>
C. <% List catalog = config.getAttribute("catalog"); %>
D. <% List catalog = context.getAttribute("catalog"); %>
正解：B

質問 2：
Your web application uses a simple architecture in which servlets handle requests and then forward to a JSP using a request dispatcher. You need to pass information calculated in the servlet to the JSP for view generation. This information must NOT be accessible to any other servlet, JSP or session in the webapp. Which two techniques can you use to accomplish this goal? (Choose two.)
A. Add parameters to the JSP's URL when generating the request dispatcher.
B. Add attributes to the session object.
C. Use the pageContext object to add request attributes.
D. Add attributes on the request object.
E. Add parameters to the request object.
正解：A,D

質問 3：
Assume the tag handler for a st:simple tag extends SimpleTagSupport. In what way can scriptlet code be used in the body of st:simple?
A. add a pass-through Classic tag with a body content type of JSP to the body of st:simple, and place the scriptlet code in the body of that tag
B. add scripting-enabled="true" to the start tag for the st:simple element
C. Scriptlet code is NOT legal in the body of st:simple.
D. set the body content type to JSP in the TLD
正解：C

質問 4：
Given this fragment in a servlet:
23.
if(req.isUserInRole("Admin")) {
24.
// do stuff
25.
}
And the following fragment from the related Java EE deployment descriptor:
812.
<security-role-ref>
813.
<role-name>Admin</role-name>
814.
<role-link>Administrator</role-link>
815.
</security-role-ref>
900.
<security-role>
901.
<role-name>Admin</role-name>
902.
<role-name>Administrator</role-name>
903.
</security-role>
What is the result?
A. If line 24 executes the user's role will NOT be predictable.
B. If line 24 executes, the user's role will be Administrator.
C. The deployment descriptor is NOT valid.
D. If line 24 executes, the user's role will be Admin.
E. Line 24 can never be reached.
正解：B

質問 5：
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. Intercepting Filter
B. Transfer Object
C. Front Controller
D. Business Delegate
E. Service Locator
F. Model-View-Controller
正解：E

質問 6：
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. Transfer Object
C. Data Access Object
D. Business Delegate
E. Command
F. Service Locator
正解：F