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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:

1. Users of your web application have requested that they should be able to set the duration of their sessions. So for example, one user might want a webapp to stay connected for an hour rather than the webapp's default of fifteen minutes; another user might want to stay connected for a whole day.
Furthermore, you have a special login servlet that performs user authentication and retrieves the User object from the database. You want to augment this code to set up the user's specified session duration.
Which code snippet in the login servlet will accomplish this goal?

A) User user = // retrieve the User object from the database
session.setMaxDuration(user.getSessionDuration());
B) User user = // retrieve the User object from the database
session.setDuration(user.getSessionDuration());
C) User user = // retrieve the User object from the database
session.setMaxDurationInterval(user.getSessionDuration());
D) User user = // retrieve the User object from the database
session.setInactiveInterval(user.getSessionDuration());
E) User user = // retrieve the User object from the database
session.setDurationInterval(user.getSessionDuration());
F) User user = // retrieve the User object from the database
session.setMaxInactiveInterval(user.getSessionDuration());

2. Given:
1 1. public class MyServlet extends HttpServlet {
1 2. public void service(HttpServletRequest request,
1 3. HttpServletResponse response)
1 4. throws ServletException, IOException {
1 5. // insert code here
1 6. }
1 7. }
and this element in the web application's deployment descriptor:
< error-page>
< error-code>302</error-code>
< location>/html/error.html</location>
< /error-page>
Which, inserted at line 15, causes the container to redirect control to the error.html resource?

A) response.setStatus(302);
B) response.sendError(302);
C) response.setError(302);
D) response.sendErrorRedirect(302);
E) response.sendRedirect(302);

3. A developer is designing the presentation tier for a web application which requires a centralized request handling to complete common processing required by each request.
Which design pattern provides a solution to this problem?

A) Remote Proxy
B) Data Access Object
C) Intercepting Filter
D) Service Activator
E) Front Controller
F) Business Delegate

4. You have built a web application that you license to small businesses. The webapp uses a context parameter, called licenseExtension, which enables certain advanced features based on your client's license package. When a client pays for a specific service, you provide them with a license extension key that they insert into the <context-param> of the deployment descriptor. Not every client will have this context parameter so you need to create a context listener to set up a default value in the licenseExtension parameter. Which code snippet will accomplish this goal?

A) You cannot do this because context parameters CANNOT be altered programmatically.
B) String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.setInitParameter('licenseExtension', DEFAULT);
}
C) String ext = context.getParameter('licenseExtension');
if ( ext == null ) {
context.setParameter('licenseExtension', DEFAULT);
}
D) String ext = context.getAttribute('licenseExtension');
if ( ext == null ) {
context.setAttribute('licenseExtension', DEFAULT);
}
E) String ext = context.getInitParameter('licenseExtension');
if ( ext == null ) {
context.resetInitParameter('licenseExtension', DEFAULT);
}

5. You are building your own layout mechanism by including dynamic content for the page's header and footer sections. The footer is always static, but the header generates the <title> tag that requires the page name to be specified dynamically when the header is imported.
Which JSP code snippet performs the import of the header content?

A) <jsp:import page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageName' value='Welcome Page' />
< /jsp:import>
B) <jsp:import page='/WEB-INF/jsp/header.jsp'>
< jsp:attribute name='pageName' value='Welcome Page' />
< /jsp:import>
C) <jsp:include page='/WEB-INF/jsp/header.jsp'>
< jsp:attribute name='pageName' value='Welcome Page' />
< /jsp:include>
D) <jsp:include page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageName' value='Welcome Page' />
< /jsp:include>

Solutions: