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SUN Sun Certified Web Component Developer for J2EE 5 Sample Questions:
1. You have a simple web application that has a single Front Controller servlet that dispatches to JSPs to generate a variety of views. Several of these views require further database processing to retrieve the necessary order object using the orderID request parameter. To do this additional processing, you pass the request first to a servlet that is mapped to the
URL pattern /WEB-INF/retreiveOrder.do in the deployment descriptor. This servlet takes two request parameters, the orderID and the jspURL. It handles the database calls to retrieve and build the complex order objects and then it dispatches to the jspURL.
Which code snippet in the Front Controller servlet dispatches the request to the order retrieval servlet?
A) String T="/WEB-INF/retreiveOrder.do?orderID=%d&jspURL=%s";
String url = String.format(T, orderID, jspURL);
RequestDispatcher view
= context.getRequestDispatcher(url);
view.forward(request, response);
B) request.setParameter("orderID", orderID);
request.setParameter("jspURL", jspURL);
Dispatcher view
= request.getDispatcher("/WEB-INF/retreiveOrder.do");
view.forwardRequest(request, response);
C) request.setAttribute("orderID", orderID);
request.setAttribute("jspURL", jspURL);
RequestDispatcher view
= context.getRequestDispatcher("/WEB-INF/retreiveOrder.do");
view.forward(request, response);
D) String T="/WEB-INF/retreiveOrder.do?orderID=%d&jspURL=%s";
String url = String.format(T, orderID, jspURL);
Dispatcher view
= context.getDispatcher(url);
view.forwardRequest(request, response);
2. 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 doAfterBody method is NOT called.
B) The doStartTag method is called once.
C) The SKIP_PAGE constant is a valid return value for the doStartTag method.
D) The EVAL_BODY_BUFFERED constant is a valid return value for the doStartTag method.
E) The EVAL_PAGE constant is a valid return value for the doEndTag method.
3. You need to store a Java long primitive attribute, called customerOID, into the session scope. Which two code snippets allow you to insert this value into the session? (Choose two.)
A) long customerOID = 47L;
session.setAttribute("customerOID", customerOID);
B) long customerOID = 47L;
session.setLongAttribute("customerOID", new Long(customerOID));
C) long customerOID = 47L;
session.setAttribute("customerOID", new Long(customerOID));
D) long customerOID = 47L;
session.setNumericAttribute("customerOID", new Long(customerOID));
E) long customerOID = 47L;
session.setNumericAttribute("customerOID", customerOID);
F) long customerOID = 47L;
session.setLongAttribute("customerOID", customerOID);
4. What is the purpose of session management?
A) To store information on the server-side between HTTP requests.
B) To manage the user's login and logout activities.
C) To store information on the client-side between HTTP requests.
D) To tell the web container to keep the HTTP connection alive so it can make subsequent requests without the delay of making the TCP connection.
5. You need to create a JSP that generates some JavaScript code to populate an array of strings used on the client-side. Which JSP code snippet will create this array?
A) MY_ARRAY = new Array();
< % for ( int i = 0; i < serverArray.length; i++ ) {
MY_ARRAY[<%= i %>] = '<%= serverArray[i] %>';
} %>
B) MY_ARRAY = new Array();
< % for ( int i = 0; i < serverArray.length; i++ ) { %>
MY_ARRAY[${i}] = '${serverArray[i]}';
< % } %>
C) MY_ARRAY = new Array();
< % for ( int i = 0; i < serverArray.length; i++ ) { %>
MY_ARRAY[<%= i %>] = '<%= serverArray[i] %>';
< % } %>
D) MY_ARRAY = new Array();
< % for ( int i = 0; i < serverArray.length; i++ ) {
MY_ARRAY[${i}] = '${serverArray[i]}';
} %>
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B,E | Question # 3 Answer: A,C | Question # 4 Answer: A | Question # 5 Answer: C |
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