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

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

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

2. For manageability purposes, you have been told to add a "count" instance variable to a critical JSP Document so that a JMX MBean can track how frequent this JSP is being invoked. Which JSP code snippet must you use to declare this instance variable in the JSP
Document?

A) <%! int count = 0; %>
B) <jsp:declaration.instance>
int count = 0;
< jsp:declaration.instance>
C) <jsp:declaration>
int count = 0;
< jsp:declaration>
D) <jsp:scriptlet.declaration>
int count = 0;
< jsp:scriptlet.declaration>

3. Given:
3 . class MyServlet extends HttpServlet {
4 . public void doPut(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
5. // servlet code here
...
2 6. }
2 7. }
If the DD contains a single security constraint associated with MyServlet and its only <http- method> tags and <auth-constraint> tags are:
< http-method>GET</http-method>
< http-method>PUT</http-method>
< auth-constraint>Admin</auth-constraint>
Which four requests would be allowed by the container? (Choose four.)

A) A user whose role is Member can perform a GET.
B) A user whose role is Admin can perform a GET.
C) A user whose role is Member can perform a POST.
D) A user whose role is Admin can perform a PUT.
E) A user whose role is Admin can perform a POST.
F) A user whose role is Member can perform a PUT.

4. Given this fragment in a servlet:
2 3. if(req.isUserInRole("Admin")) {
2 4. // do stuff
2 5. }
And the following fragment from the related Java EE deployment descriptor:
8 12. <security-role-ref>
8 13. <role-name>Admin</role-name>
8 14. <role-link>Administrator</role-link>
8 15. </security-role-ref>
9 00. <security-role>
9 01. <role-name>Admin</role-name>
9 02. <role-name>Administrator</role-name>
9 03. </security-role>
What is the result?

A) Line 24 can never be reached.
B) If line 24 executes, the user's role will be Admin.
C) The deployment descriptor is NOT valid.
D) If line 24 executes the user's role will NOT be predictable.
E) If line 24 executes, the user's role will be Administrator.

5. Click the Exhibit button.
The attribute "name" has a value of "Foo,"
What is the result if this tag handler's tag is invoked?

A) Foodone
B) Foo
C) An exception is thrown at runtime.
D) Compilation fails because of an error in this code.
E) done
F) No output is produced from this code.

Solutions: