Sun Certified Web Component Developer for J2EE 5 (310-083) Free Practice Test

Question 1

A developer is designing a web application that must verify for each request:
The originating request is from a trusted network.
The client has a valid session.
The client has been authenticated.
Which design pattern provides a solution in this situation?

A. Model-View-Controller

B. Intercepting Filter

C. Template Method

D. Transfer Object

E. Session Facade

Correct Answer: B

Question 2

Given:
1 1. <servlet>
1 2. <servlet-name>catalog</servlet-name>
1 3. <jsp-file>/catalogTemplate.jsp</jsp-file>
1 4. <load-on-startup>10</load-on-startup>
1 5. </servlet>
Which two are true? (Choose two.)

A. The servlet will be referenced by the name catalog in mappings.

B. Line 13 is not valid for a servlet declaration.

C. Line 14 is not valid for a servlet declaration.

D. One instance of the servlet will be loaded at startup.

E. Ten instances of the servlet will be loaded at startup.

Correct Answer: A,D

Question 3

Which statement is true about web container session management?

A. The JSESSIONID cookie is stored permanently on the client so that a user may return to the web application and the web container will rejoin that session.

B. To activate URL rewriting, the developer must use the
HttpServletResponse.setURLRewriting method.

C. If the web application uses HTTPS, then the web container may use the data on the
HTTPS request stream to identify the client.

D. Access to session-scoped attributes is guaranteed to be thread-safe by the web container.

Correct Answer: C

Question 4

Given:
6. <myTag:foo bar='42'>
7. <%="processing" %>
8. </myTag:foo>
and a custom tag handler for foo which extends TagSupport.
Which two are true about the tag handler referenced by foo? (Choose two.)

A. The EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.

B. The doAfterBody method is NOT called.

C. The doStartTag method is called once.

D. The SKIP_PAGE constant is a valid return value for the doStartTag method.

E. The EVAL_PAGE constant is a valid return value for the doEndTag method.

Correct Answer: C,E

Question 5

Given a JSP page:
1 1. <n:recurse>
1 2. <n:recurse>
1 3. <n:recurse>
1 4. <n:recurse />
1 5. </n:recurse>
1 6. </n:recurse>
1 7. </n:recurse>
The tag handler for n:recurse extends SimpleTagSupport.
Assuming an n:recurse tag can either contain an empty body or another n:recurse tag, which strategy allows the tag handler for n:recurse to output the nesting depth of the deepest n:recurse tag?

A. Start a counter at 1. Call getChildTags(). If it returns null, output the value of the counter.
Otherwise, increment counter and continue from where getChildTags() is called. Skip processing of the body.

B. Create a private non-static attribute in the tag handler class called count of type int initialized to 0. Increment count in the doTag method. If the tag has a body, invoke the fragment for that body. Otherwise, output the value of count.

C. It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags.

D. If the tag has a body, invoke the fragment for that body.Otherwise, start a counter at 1.
Call getParent(). If it returns null, output the value of the counter Otherwise, increment the counter and continue from where getParent() is called.

Correct Answer: D

Question 6

Which two actions protect a resource file from direct HTTP access within a web application? (Choose two.)

A. creating a <secure-resource> element within the deployment descriptor

B. placing it in the /WEB-INF directory

C. placing it in the /META-INF/secure directory

D. creating a <web-resource> element within the deployment descriptor

E. placing it in the /secure directory

Correct Answer: B,C

Question 7

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 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
}

B. 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
}

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 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
}

Correct Answer: B

Question 8

Click the Exhibit button.
Assuming the tag library in the exhibit is imported with the prefix forum, which custom tag invocation produces a translation error in a JSP page?

A. <forum:message from="My Name"
subject="<%= request.getParameter( "subject" ) %>">
My message body.
< /forum:message>

B. <forum:message from="My Name" subject="My Subject">
< %= request.getParameter( "body" ) %>
< /forum:message>

C. <forum:message from="My Name" subject="${param.subject}">
${param.body}
< /forum:message>

D. <forum:message from="My Name" subject="My Subject" />

E. <forum:message subject="My Subject">
My message body.
< /forum:message>

Correct Answer: B

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SUN Sun Certified Web Component Developer for J2EE 5 (310-083) Free Practice Test