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

2. A developer is designing a web application that makes many fine-grained remote data requests for each client request. During testing, the developer discovers that the volume of remote requests significantly degrades performance of the application. Which design pattern provides a solution for this problem?

A) Transfer Object
B) Flyweight
C) Business Delegate
D) Dispatcher View
E) Service Locator
F) Model-View-Controller

3. Given an EL function foo, in namespace func, that requires a long as a parameter and returns a Map, which two are valid invocations of function foo? (Choose two.)

A) ${foo(5):func}
B) ${func:foo("easy")}
C) ${foo:func(4)}
D) ${func:foo("3").name}
E) ${func:foo(2)}
F) ${func(1)}

4. Assume a JavaBean com.example.GradedTestBean exists and has two attributes. The attribute name is of type java.lang.String and the attribute score is of type java.lang.Integer.
An array of com.example.GradedTestBean objects is exposed to the page in a request- scoped attribute called results. Additionally, an empty java.util.HashMap called resultMap is placed in the page scope.
A JSP page needs to add the first entry in results to resultMap, storing the name attribute of the bean as the key and the score attribute of the bean as the value.
Which code snippet of JSTL code satisfies this requirement?

A) ${resultMap[results[0].name] = results[0].score}
B) <c:set var="resultMap" property="${results[0].name}">
$ {results[0].value}
< /c:set>
C) <c:set target="${resultMap}" property="${results[0].name}"
value="${results[0].score}" />
D) <c:set var="${resultMap}" key="${results[0].name}"
value="${results[0].score}" />
E) <c:set var="resultMap" property="${results[0].name}"
value="${results[0].score}" />

5. Which two prevent a servlet from handling requests? (Choose two.)

A) The servlet's init method returns a non-zero status.
B) The servlet's init method throws a ServletException.
C) The servlet's init method does NOT return within a time period defined by the servlet container.
D) The servlet's init method sets the ServletResponse's content type to null.
E) The servlet's init method sets the ServletResponse's content length to 0.

Solutions: