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Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:
1. Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.service method:
20.
String key = "com.example.data";
21.
session.setAttribute(key, "Hello");
22.
Object value = session.getAttribute(key);
23.
Assume session is an HttpSession, and is not referenced anywhere else in ServletA.
Which two changes, taken together, ensure that value is equal to "Hello" on line 23? (Choose two.)
A) enclose lines 21-22 in a synchronized block:
synchronized(this) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
B) ensure that ServletB synchronizes on the session object when setting session attributes
C) ensure that the ServletA.service method is synchronized
D) ensure that the ServletB.service method is synchronized
E) enclose lines 21-22 in a synchronized block:
synchronized(session) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
2. DRAG DROP
Click the Task button.
Place the XML elements in the web application deployment descriptor solution to configure a servlet context event listener named com.example.MyListener.
3. Which two classes or interfaces provide a getSession method? (Choose two.)
A) javax.servlet.http.HttpSessionContext
B) javax.servlet.http.HttpSessionAttributeEvent
C) javax.servlet.http.HttpServletRequest
D) javax.servlet.http.HttpServletResponse
E) javax.servlet.http.HttpSessionBindingEvent
4. 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.setAttribute("orderID", orderID);
request.setAttribute("jspURL", jspURL);
RequestDispatcher view
= context.getRequestDispatcher("/WEB-INF/retreiveOrder.do");
view.forward(request, response);
C) 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);
D) request.setParameter("orderID", orderID);
request.setParameter("jspURL", jspURL);
Dispatcher view
= request.getDispatcher("/WEB-INF/retreiveOrder.do");
view.forwardRequest(request, response);
5. Click the Exhibit button. Given the web application deployment descriptor elements:
11.
<filter>
12.
<filter-name>ParamAdder</filter-name>
13.
<filter-class>com.example.ParamAdder</filter-class>
14.
</filter> ...
31.
<filter-mapping>
32.
<filter-name>ParamAdder</filter-name>
33.
<servlet-name>Destination</servlet-name>
34.
</filter-mapping> ...
55.
<servlet-mapping>
56.
<servlet-name>Destination</servlet-name>
57.
<url-pattern>/dest/Destination</url-pattern>
58.
</servlet-mapping>
What is the result of a client request of the Source servlet with no query string?
A) An exception is thrown at runtime within the service method of the Source servlet.
B) An exception is thrown at runtime within the service method of the Destination servlet.
C) The output "filterAdded = addedByFilter" is written to the response stream.
D) The output "filterAdded = null" is written to the response stream.
Solutions:
Question # 1 Answer: B,E | Question # 2 Answer: Only visible for members | Question # 3 Answer: C,E | Question # 4 Answer: A | Question # 5 Answer: D |