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

1. You want to create a filter for your web application and your filter will implement javax.servlet.Filter.
Which two statements are true? (Choose two.)

A) The method that your filter invokes on the object it received that implements javax.servlet.FilterChain can invoke either another filter or a servlet.
B) Your filter class must also implement javax.servlet.FilterChain.
C) When your filter chains to the next filter, it should pass the same arguments it received in its doFilter method.
D) Your filter class must implement an init method and a destroy method.
E) Your filter class must implement a doFilter method that takes, among other things, an
HTTPServletRequest object and an HTTPServletResponse object.

2. You have built a collection of custom tags for your web application. The TLD file is located in the file: /WEB-INF/myTags.xml. You refer to these tags in your JSPs using the symbolic name: myTags. Which deployment descriptor element must you use to make this link between the symbolic name and the TLD file name?

A) <tags>
< tags-uri>myTags</taglib-uri>
< tags-location>/WEB-INF/myTags.xml</tags-location>
< /tags>
B) <taglib>
< name>myTags</name>
< location>/WEB-INF/myTags.xml</location>
< /taglib>
C) <tags>
< name>myTags</name>
< location>/WEB-INF/myTags.xml</location>
< /tags>
D) <taglib>
< taglib-uri>myTags</taglib-uri>
< taglib-location>/WEB-INF/myTags.xml</taglib-location>
< /taglib>

3. Given the definition of MyServlet:
1 1. public class MyServlet extends HttpServlet {
1 2. public void service(HttpServletRequest request,
1 3. HttpServletResponse response)
1 4. throws ServletException, IOException {
1 5. HttpSession session = request.getSession();
1 6 session.setAttribute("myAttribute","myAttributeValue");
1 7. session.invalidate();
1 8. response.getWriter().println("value=" +
1 9. session.getAttribute("myAttribute"));
2 0. }
2 1. }
What is the result when a request is sent to MyServlet?

A) An IllegalStateException is thrown at runtime.
B) An InvalidSessionException is thrown at runtime.
C) The string "value=myAttributeValue" appears in the response stream.
D) The string "value=null" appears in the response stream.

4. Given:
1 1. public class MyServlet extends HttpServlet {
1 2. public void service(HttpServletRequest request,
1 3. HttpServletResponse response)
1 4. throws ServletException, IOException {
1 5. // insert code here
1 6. }
1 7. }
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.sendError(302);
B) response.sendErrorRedirect(302);
C) response.sendRedirect(302);
D) response.setError(302);
E) response.setStatus(302);

5. Which two directives are applicable only to tag files? (Choose two.)

A) page
B) taglib
C) tag
D) variable
E) include

Solutions: