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Oracle 1Z0-858 Exam Syllabus Topics:

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

1. Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?

A) Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
B) Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
C) Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
D) Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.

2. 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 contextCreated(ServletContext ctx) {
String prefsURL = ctx.getParameter("prefsDbURL");
PreferencesFactory myFactory = makeFactory(prefsURL);
ctx.putAttribute("myPrefsFactory", myFactory);
}
// more code here
}
B) 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
}
C) 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
}
D) 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 }

3. Given a portion of a valid Java EE web application's directory structure:
MyApp | |-- File1.html | |-- Directory1 | |-- File2.html | |-- META-INF |-- File3.html
You want to know whether File1.html, File2.html, and/or File3.html will be directly accessible by your web client's browsers.
Which statement is true?

A) Only File1.html is directly accessible.
B) All three files are directly accessible.
C) Only File1.html and File3.html are directly accessible.
D) Only File2.html is directly accessible.
E) Only File3.html is directly accessible.
F) Only File2.html and File3.html are directly accessible.
G) Only File1.html and File2.html are directly accessible.

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

5. Given the security constraint in a DD:
101.
<security-constraint>
102.
<web-resource-collection>
103.
<web-resource-name>Foo</web-resource-name>
104.
<url-pattern>/Bar/Baz/*</url-pattern>
105.
<http-method>POST</http-method>
106.
</web-resource-collection>
107.
<auth-constraint>
108.
<role-name>DEVELOPER</role-name>
109.
</auth-constraint>
110.
</security-constraint>
And given that "MANAGER" is a valid role-name, which four are true for this security constraint? (Choose four.)

A) DEVELOPER can do a GET on resources in the /Bar/Baz directory.
B) MANAGER can do a GET on resources in the /Bar/Baz directory.
C) MANAGER can do a POST on any resource in the /Bar/Baz directory.
D) MANAGER can do a TRACE on any resource in the /Bar/Baz directory.
E) DEVELOPER can do a TRACE on any resource in the /Bar/Baz directory.
F) DEVELOPER can do only a POST on resources in the /Bar/Baz directory.

Solutions: