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

1. You have been contracted to create a web site for a free dating service. One feature is the ability for one client to send a message to another client, which is displayed in the latter client's private page. Your contract explicitly states that security is a high priority.
Therefore, you need to prevent cross-site hacking in which one user inserts JavaScript code that is then rendered and invoked when another user views that content. Which two
JSTL code snippets will prevent cross-site hacking in the scenario above? (Choose two.)

A) <c:out>${message}</c:out>
B) <c:out value='${message}' eliminateXml='true' />
C) <c:out eliminateXml='true'>${message}</c:out>
D) <c:out value='${message}' escapeXml='true' />
E) <c:out value='${message}' />

2. Given:
1 0. public void service(ServletRequest request,
1 1. ServletResponse response) {
1 2. ServletInputStream sis =
1 3. // insert code here
1 4. }
Which retrieves the binary input stream on line 13?

A) request.getResourceAsStream(ServletRequest.REQUEST);
B) request.getInputStream();
C) request.getReader();
D) request.getWriter();
E) request.getResourceAsStream();

3. Given:
http://com.example/myServlet.jsp?num=one&num=two&num=three
Which two produce the output "one, two and three"? (Choose two.)

A) ${paramValues["num"][0]}, ${paramValues["num"][1]} and ${paramValues["num"][2]}
B) ${param.num[0]}, ${param.num[1]} and ${param.num[2]}
C) ${paramValues.num[0]}, ${paramValues.num[1]} and ${paramValues.num[2]}
D) ${parameterValues.num[0]}, ${parameterValues.num[1]} and
$ {parameterValues.num[2]}
E) ${parameterValues["num"]["0"]}, ${parameterValues["num"]["1"]} and
$ {parameterValues["num"]["2"]}
F) ${paramValues[0],[1] and [2]}
G) ${param.num[0],[1] and [2]}

4. Given the security constraint in a DD:
1 01. <security-constraint>
1 02. <web-resource-collection>
1 03. <web-resource-name>Foo</web-resource-name>
1 04. <url-pattern>/Bar/Baz/*</url-pattern>
1 05. <http-method>POST</http-method>
1 06. </web-resource-collection>
1 07. <auth-constraint>
1 08. <role-name>DEVELOPER</role-name>
1 09. </auth-constraint>
1 10. </security-constraint>
And given that "MANAGER" is a valid role-name, which four are true for this security constraint? (Choose four.)

A) DEVELOPER can do a TRACE on any resource in the /Bar/Baz directory.
B) MANAGER can do a POST on any resource in the /Bar/Baz directory.
C) DEVELOPER can do only a POST on resources in the /Bar/Baz directory.
D) MANAGER can do a GET on resources in the /Bar/Baz directory.
E) MANAGER can do a TRACE on any resource in the /Bar/Baz directory.
F) DEVELOPER can do a GET on resources in the /Bar/Baz directory.

5. Which two are true regarding a web application class loader? (Choose two.)

A) A web application may override the web container's implementation classes.
B) A web application class loader may NOT override any classes in the java.* and javax.* namespaces.
C) A web application running in a J2EE product may override classes in the javax.* namespace.
D) Resources in the WAR class directory or in any of the JAR files within the library directory CANNOT be accessed using the J2SE semantics of getResource.
E) Resources in the WAR class directory or in any of the JAR files within the library directory may be accessed using the J2SE semantics of getResource.

Solutions: