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

1. A web application uses the HttpSession mechanism to determine if a user is "logged in." When a user supplies a valid user name and password, an HttpSession is created for that user.
The user has access to the application for only 15 minutes after logging in. The code must determine how long the user has been logged in, and if this time is greater than 15 minutes, must destroy the HttpSession.
Which method in HttpSession is used to accomplish this?

A) invalidateAfter
B) getLastAccessedTime
C) getCreationTime
D) getMaxInactiveInterval

2. A developer is designing the presentation tier for a web application that relies on a complex session bean. The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the session bean API directly impacts the development of the presentation tier. Which design pattern provides a means to manage the uncertainty in the API?

A) Business Delegate
B) Composite View
C) Intercepting Filter
D) Chain of Responsibility
E) View Helper
F) Front Controller

3. The Squeaky Beans Inc. shopping application was initially developed for a non-distributed environment. The company recently purchased the Acme Application Server, which supports distributed HttpSession objects. When deploying the application to the server, the deployer marks it as distributable in the web application deployment descriptor to take advantage of this feature.
Given this scenario, which two must be true? (Choose two.)

A) As per the specification, the J2EE web container ensures that distributed HttpSession objects will be stored in a database.
B) The J2EE web container must use the native JVM Serialization mechanism for distributing HttpSession objects.
C) The J2EE web container must support migration of objects that implement Serializable.
D) Storing references to Enterprise JavaBeans components in the HttpSession object might NOT be supported by J2EE web containers.

4. Given:
11.
public class MyServlet extends HttpServlet {
12.
public void service(HttpServletRequest request,
13.
HttpServletResponse response)
14.
throws ServletException, IOException {
15.
// insert code here
16.
}
17.
}
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.sendRedirect(302);
C) response.setError(302);
D) response.sendError(302);
E) response.sendErrorRedirect(302);

5. For which three events can web application event listeners be registered? (Choose three.)

A) when a session attribute value is changed
B) after a servlet is destroyed
C) when a servlet has forwarded a request
D) when a session is created
E) when a cookie has been created
F) when a session has timed out

Solutions: