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

1. Which method must be used to encode a URL passed as an argument to
HttpServletResponse.sendRedirect when using URL rewriting for session tracking?

A) ServletResponse.encodeURL
B) ServletResponse.encodeRedirectURL
C) HttpServletResponse.encodeURL
D) HttpServletResponse.encodeRedirectURL

2. Which three are true about servlet filters? (Choose three.)

A) A filter must implement the doFilter method.
B) A filter must implement the destroy method.
C) A servlet may have multiple filters associated with it.
D) A filter that is part of a filter chain passes control to the next filter in the chain by invoking the FilterChain.forward method.
E) For each <filter> element in the web application deployment descriptor, multiple instances of a filter may be created by the web container.
F) A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain interface.

3. Given:
6. <myTag:foo bar='42'>
7 . <%="processing" %>
8 . </myTag:foo>
and a custom tag handler for foo which extends TagSupport.
Which two are true about the tag handler referenced by foo? (Choose two.)

A) The SKIP_PAGE constant is a valid return value for the doStartTag method.
B) The doStartTag method is called once.
C) The EVAL_PAGE constant is a valid return value for the doEndTag method.
D) The doAfterBody method is NOT called.
E) The EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.

4. You need to retrieve the username cookie from an HTTP request. If this cookie does NOT exist, then the c variable will be null. Which code snippet must be used to retrieve this cookie object?

A) 10. Cookie c = null;
1 1. for ( Iterator i = request.getCookies();
1 2. i.hasNext(); ) {
1 3. Cookie o = (Cookie) i.next();
1 4. if ( o.getName().equals("username") ) {
1 5. c = o;
1 6. break;
1 7. }
1 8. }
B) 10. Cookie c = request.getCookie("username");
C) 10. Cookie c = null;
1 1. Cookie[] cookies = request.getCookies();
1 2. for ( int i = 0; i < cookies.length; i++ ) {
1 3. if ( cookies[i].getName().equals("username") ) {
1 4. c = cookies[i];
1 5. break;
1 6. }
1 7. }
D) 10. Cookie c = null;
1 1. for ( Enumeration e = request.getCookies();
1 2. e.hasMoreElements(); ) {
1 3. Cookie o = (Cookie) e.nextElement();
1 4. if ( o.getName().equals("username") ) {
1 5. c = o;
1 6. break;
1 7. }
1 8. }

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

Solutions: