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

1. Given this fragment from a Java EE deployment descriptor:
3 41. <error-page>
3 42. <exception-type>java.lang.Throwable</exception-type>
3 43. <location>/mainError.jsp</location>
3 44. </error-page>
3 45. <error-page>
3 46. <exception-type>java.lang.ClassCastException</exception-type>
3 47. <location>/castError.jsp</location>
3 48. </error-page>
If the web application associated with the fragment above throws a ClassCastException.
Which statement is true?

A) The container invokes castError.jsp.
B) The container invokes mainError.jsp.
C) The deployment descriptor is invalid.
D) Neither mainError.jsp nor castError.jsp is invoked.

2. Which two statements are true about using the isUserInRole method to implement security in a Java EE application? (Choose two.)

A) Can return "true" even when its argument is NOT defined as a valid role name in the deployment descriptor.
B) Using the isUserInRole method overrides any declarative authentication related to the method in which it is invoked.
C) It can be invoked only from the doGet or doPost methods.
D) It can be used independently of the getRemoteUser method.
E) Using the isUserInRole method overrides any declarative authorization related to the method in which it is invoked.

3. You are developing several tag libraries that will be sold for development of third-party web applications. You are about to publish the first three libraries as JAR files: container- tags.jar, advanced-html-form-tags.jar, and basic-html-form-tags.jar. Which two techniques are appropriate for packaging the TLD files for these tag libraries? (Choose two.)

A) The TLD must be located within the META-INF directory of the JAR file.
B) The TLD must be located within the META-INF/tld/ directory of the JAR file.
C) The TLD must be located within the WEB-INF directory of the JAR file.
D) The TLD must be located within a subdirectory of META-INF/tld/ directory of the JAR file.
E) The TLD must be located within a subdirectory of WEB-INF directory of the JAR file.
F) The TLD must be located within a subdirectory of META-INF directory of the JAR file.

4. Your web application uses a simple architecture in which servlets handle requests and then forward to a JSP using a request dispatcher. You need to pass information calculated by the servlet to the JSP; furthermore, that JSP uses a custom tag and must also process this information. This information must NOT be accessible to any other servlet, JSP or session in the webapp. How can you accomplish this goal?

A) Add an attribute to the context object before using the request dispatcher.
B) This CANNOT be done as the tag handler has no means to extract this data.
C) Add an attribute to the request object before using the request dispatcher.
D) Store the data in a public instance variable in the servlet.

5. What is true about Java EE authentication mechanisms?

A) If your deployment descriptor correctly declares an authentication type of BASIC, the container automatically requests a user name and password whenever a user starts a new session.
B) If your deployment descriptor correctly declares an authentication type of
CLIENT_CERT, your users must have a certificate from an official source before they can use your application.
C) If you want your web application to support the widest possible array of browsers, and you want to perform authentication, the best choice of Java EE authentication mechanisms is DIGEST.
D) To use Java EE FORM authentication, you must declare two HTML files in your deployment descriptor, and you must use a predefined action in the HTML file that handles your user's login.

Solutions: