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

1. Which security mechanism uses the concept of a realm?

A) authorization
B) authentication
C) data integrity
D) confidentiality

2. Which three are true about TLD files? (Choose three.)

A) When deployed inside a JAR file, TLD files must be in the META-INF directory, or a subdirectory of it.
B) A tag handler's attribute must be included in the TLD file only if the attribute can accept request-time expressions.
C) The web container recognizes TLD files placed in any subdirectory of WEB-INF.
D) The web container can generate an implicit TLD file for a tag library comprised of both simple tag handlers and tag files.
E) The web container can automatically extend the tag library map described in a web.xml file by including entries extracted from the web application's TLD files.

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

4. Your IT department is building a lightweight Front Controller servlet that invokes an application logic object with the interface:
public interface ApplicationController {
public String invoke(HttpServletRequest request)
}
The return value of this method indicates a symbolic name of the next view. From this name, the Front Controller servlet looks up the JSP URL in a configuration table. This URL might be an absolute path or a path relative to the current request. Next, the Front
Controller servlet must send the request to this JSP to generate the view. Assume that the servlet variable request is assigned the current HttpServletRequest object and the variable context is assigned the webapp's ServletContext.
Which code snippet of the Front Controller servlet accomplishes this goal?

A) RequestDispatcher view
= request.getRequestDispatcher(viewURL);
view.forward(request, response);
B) RequestDispatcher view
= context.getRequestDispatcher(viewURL);
view.forward(request, response);
C) Dispatcher view
= request.getDispatcher(viewURL);
view.forwardRequest(request, response);
D) Dispatcher view
= context.getDispatcher(viewURL);
view.forwardRequest(request, response);

5. Given:
3 . public class MyTagHandler extends TagSupport {
4 . public int doStartTag() {
5 . // insert code here
6 . // return an int
7 . }
8 . // more code here
...
18. }
There is a single attribute foo in the session scope.
Which three code fragments, inserted independently at line 5, return the value of the attribute? (Choose three.)

A) Object o = pageContext.getAttribute("foo",
PageContext.SESSION_SCOPE);
B) HttpSession s = pageContext.getSession();
Object o = s.getAttribute("foo");
C) Object o = pageContext.findAttribute("foo");
D) HttpServletRequest r = pageContext.getRequest();
Object o = r.getAttribute("foo");
E) Object o = pageContext.getAttribute("foo");

Solutions: