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Oracle 1Z0-858 Exam Syllabus Topics:

Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:

1. Which three are true about servlet filters? (Choose three.)

A) A servlet may have multiple filters associated with it.
B) A filter must implement the doFilter method.
C) A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain interface.
D) A filter that is part of a filter chain passes control to the next filter in the chain by invoking the FilterChain.forward method.
E) A filter must implement the destroy method.
F) For each <filter> element in the web application deployment descriptor, multiple instances of a filter may be created by the web container.

2. 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 Admin.
C) Line 24 can never be reached.
D) If line 24 executes, the user's role will be Administrator.
E) The deployment descriptor is NOT valid.

3. Your web site has many user-customizable features, for example font and color
preferences on web pages. Your IT department has already built a subsystem for user preferences using the Java SE platform's lang.util.prefs package APIs, and you have been ordered to reuse this subsystem in your web application. You need to create an event listener that constructs the preferences factory and stores it in the application scope for later use. Furthermore, this factory requires that the URL to a database must be declared in the deployment descriptor like this:
42.
<context-param>
43.
<param-name>prefsDbURL</param-name>
44.
<param-value>
45.
jdbc:pointbase:server://dbhost:4747/prefsDB
46.
</param-value>
47.
</context-param>
Which partial listener class will accomplish this goal?

A) public class PrefsFactoryInitializer implements ContextListener {
public void contextInitialized(ServletContextEvent e) {
ServletContext ctx = e.getContext();
String prefsURL = ctx.getParameter("prefsDbURL");
PreferencesFactory myFactory = makeFactory(prefsURL);
ctx.putAttribute("myPrefsFactory", myFactory);
}
// more code here
}
B) public class PrefsFactoryInitializer implements ServletContextListener {
public void contextInitialized(ServletContextEvent e) {
ServletContext ctx = e.getServletContext();
String prefsURL = ctx.getInitParameter("prefsDbURL");
PreferencesFactory myFactory = makeFactory(prefsURL);
ctx.setAttribute("myPrefsFactory", myFactory);
}
// more code here }
C) public class PrefsFactoryInitializer implements ContextListener {
public void contextCreated(ServletContext ctx) {
String prefsURL = ctx.getParameter("prefsDbURL");
PreferencesFactory myFactory = makeFactory(prefsURL);
ctx.putAttribute("myPrefsFactory", myFactory);
}
// more code here
}
D) public class PrefsFactoryInitializer implements ServletContextListener {
public void contextCreated(ServletContext ctx) {
String prefsURL = ctx.getInitParameter("prefsDbURL");
PreferencesFactory myFactory = makeFactory(prefsURL);
ctx.setAttribute("myPrefsFactory", myFactory);
}
// more code here
}

4. A web browser need NOT always perform a complete request for a particular page that it suspects might NOT have changed. The HTTP specification provides a mechanism for the browser to retrieve only a partial response from the web server; this response includes information, such as the Last-Modified date but NOT the body of the page. Which HTTP method will the browser use to retrieve such a partial response?

A) SEND
B) HEAD
C) OPTIONS
D) ASK
E) TRACE
F) GET

5. A developer is designing a multi-tier web application and discovers a need to log each incoming client request. Which two patterns, taken independently, provide a solution for this problem? (Choose two.)

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

Solutions: