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

1. Which interface must a class implement so that instances of the class are notified after any object is added to a session?

A) javax.servlet.http.HttpSessionAttributeListener
B) javax.servlet.http.HttpSessionValueListener
C) javax.servlet.http.HttpSessionBindingListener
D) javax.servlet.http.HttpSessionListener

2. Which ensures that a JSP response is of type "text/plain"?

A) <% response.setMimeType("text/plain"); %>
B) <%@ page contentType="text/plain" %>
C) <%@ page mimeType="text/plain" %>
D) <%@ page pageEncoding="text/plain" %>
E) <%@ page contentEncoding="text/plain" %>
F) <% response.setEncoding("text/plain"); %>

3. For debugging purposes, you need to record how many times a given JSP is invoked before the user's session has been created. The JSP's destroy method stores this information to a database. Which JSP code snippet keeps track of this count for the lifetime of the JSP page?

A) <%@ int count = 0;
if ( request.getSession(false) == null ) count++; %>
B) <%! int count = 0;
if ( request.getSession(false) == null ) count++; %>
C) <%@ int count = 0; %>
<% if ( request.getSession(false) == null ) count++; %>
D) <% int count = 0;
if ( request.getSession(false) == null ) count++; %>
E) <%! int count = 0; %>
<% if ( request.getSession(false) == null ) count++; %>

4. 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 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
}
D) 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
}

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

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

Solutions: