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

1. Which two are valid values for the <transport-guarantee> element inside a <security- constraint> element of a web application deployment descriptor? (Choose two.)

A) CONFIDENTIAL
B) INTEGRAL
C) ENCRYPTED
D) SECURE
E) NULL

2. A developer chooses to avoid using SingleThreadModel but wants to ensure that data is updated in a thread-safe manner. Which two can support this design goal? (Choose two.)

A) Store the data in an instance variable.
B) Store the data in the HttpSession object.
C) Store the data in a local variable.
D) Store the data in the ServletContext object.
E) Store the data in the ServletRequest object.

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

4. Given:
5 . public class MyTagHandler extends TagSupport {
6 . public int doStartTag() throws JspException {
7 . try {
8 . // insert code here
9 . } catch(Exception ex) { /* handle exception */ }
1 0. return super.doStartTag();
1 1. }
...
42. }
Which code snippet, inserted at line 8, causes the value foo to be output?

A) JspWriter w = new JspWriter(pageContext.getResponse());
w.print("foo");
B) JspWriter w = new JspWriter(pageContext.getWriter());
w.print("foo");
C) JspWriter w = pageContext.getWriter();
w.print("foo");
D) JspWriter w = pageContext.getOut();
w.print("foo");

5. Which is true about the web container request processing model?

A) The init method on a filter is called the first time a servlet mapped to that filter is invoked.
B) Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file.
C) If the init method on a filter throws an UnavailableException, then the container will make no further attempt to execute it.
D) A filter defined for a servlet must always forward control to the next resource in the filter chain.

Solutions: