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Oracle 1Z0-858 Exam Syllabus Topics:

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

1. You have been contracted to create a web site for a free dating service. One feature is the ability for one client to send a message to another client, which is displayed in the latter
client's private page. Your contract explicitly states that security is a high priority. Therefore, you need to prevent cross-site hacking in which one user inserts JavaScript code that is then rendered and invoked when another user views that content. Which two JSTL code snippets will prevent cross-site hacking in the scenario above? (Choose two.)

A) <c:out value='${message}' escapeXml='true' />
B) <c:out eliminateXml='true'>${message}</c:out>
C) <c:out value='${message}' />
D) <c:out>${message}</c:out>
E) <c:out value='${message}' eliminateXml='true' />

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 Java SE'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 stores the user's Preference object when an HTTP session is created. Also, note that user identification information is stored in an HTTP cookie.
Which partial listener class can accomplish this goal?

A) public class UserPrefLoader implements SessionListener {
public void sessionCreated(SessionEvent se) {
MyPrefsFactory myFactory = (MyPrefsFactory)
se.getContext().getAttribute("myPrefsFactory");
User user = getUserFromCookie(se);
myFactory.setThreadLocalUser(user);
Preferences userPrefs = myFactory.userRoot();
se.getSession().addAttribute("prefs", userPrefs);
}
// more code here }
B) public class UserPrefLoader implements SessionListener {
public void sessionInitialized(SessionEvent se) {
MyPrefsFactory myFactory = (MyPrefsFactory)
se.getServletContext().getAttribute("myPrefsFactory");
User user = getUserFromCookie(se);
myFactory.setThreadLocalUser(user);
Preferences userPrefs = myFactory.userRoot();
se.getSession().addAttribute("prefs", userPrefs);
}
// more code here
}
C) public class UserPrefLoader implements HttpSessionListener {
public void sessionCreated(HttpSessionEvent se) {
MyPrefsFactory myFactory = (MyPrefsFactory)
se.getServletContext().getAttribute("myPrefsFactory");
User user = getUserFromCookie(se);
myFactory.setThreadLocalUser(user);
Preferences userPrefs = myFactory.userRoot();
se.getSession().setAttribute("prefs", userPrefs);
}
// more code here
}
D) public class UserPrefLoader implements HttpSessionListener {
public void sessionInitialized(HttpSessionEvent se) {
MyPrefsFactory myFactory = (MyPrefsFactory)
se.getServletContext().getAttribute("myPrefsFactory");
User user = getUserFromCookie(se);
myFactory.setThreadLocalUser(user);
Preferences userPrefs = myFactory.userRoot();
se.getHttpSession().setAttribute("prefs", userPrefs);
}
// more code here
}

3. A developer for the company web site has been told that users may turn off cookie support in their browsers. What must the developer do to ensure that these customers can still use the web application?

A) The developer can ignore this issue. Web containers are required to support automatic URL rewriting when cookies are not supported.
B) The developer must add the string id=<sessionid> to the end of every URL to ensure that the conversation with the browser can continue.
C) The developer must ensure that every URL is properly encoded using the appropriate URL rewriting APIs.
D) The developer must provide an alternate mechanism for managing sessions and abandon the HttpSession mechanism entirely.

4. Given the web application deployment descriptor elements:
11.
<filter>
12.
<filter-name>ParamAdder</filter-name>
13.
<filter-class>com.example.ParamAdder</filter-class>
14.
</filter> ...
24.
<filter-mapping>
25.
<filter-name>ParamAdder</filter-name>
26.
<servlet-name>MyServlet</servlet-name>
27.
<!-- insert element here -->
28.
</filter-mapping>
Which element, inserted at line 27, causes the ParamAdder filter to be applied when MyServlet is invoked by another servlet using the RequestDispatcher.include method?

A) <dispatcher>INCLUDE</dispatcher>
B) <include/>
C) <dispatcher>include</dispatcher>
D) <filter-condition>include</filter-condition>
E) <filter-condition>INCLUDE</filter-condition>

5. Assume the custom tag my:errorProne always throws a java.lang.RuntimeException with the message "File not found."
An error page has been configured for this JSP page.
Which option prevents the exception thrown by my:errorProne from invoking the error page mechanism, and outputs the message "File not found" in the response?

A) <c:try>
<my:errorProne />
<c:catch var="ex" />
${ex.message}
</c:try>
B) <c:try catch="ex">
<my:errorProne />
</c:try>
${ex.message}
C) <c:try>
<my:errorProne />
</c:try>
<c:catch var="ex" />
${ex.message}
D) <my:errorProne>
<c:catch var="ex">
${ex.message}
</c:catch>
</my:errorProne>
E) <c:catch var="ex">
<my:errorProne />
</c:catch>
${ex.message}

Solutions: