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Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:

1. As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionID. In addition, assume that your webapp keeps a hashmap of session objects by the ID. Here is a partial implementation of this servlet:
10.
public class SessionAgeServlet extends HttpServlet {
11.
public void service(HttpServletRequest request, HttpServletResponse) throws IOException {
12.
String sessionID = request.getParameter("sessionID");
13.
HttpSession session = getSession(sessionID);
14.
long age = // your code here
15.
response.getWriter().print(age);
16.
} ... // more code here
47. }
Which code snippet on line 14, will determine the age of the session?

A) session.getLastAccessedTime() - session.getCreationTime();
B) session.getMaxInactiveInterval() - session.getCreationTime();
C) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime();
D) session.getMaxInactiveInterval();
E) session.getLastAccessed().getTime() - session.getCreationTime().getTime();
F) session.getLastAccessed() - session.getCreationTime();

2. Assume the custom tag my:errorProne always throws a java.lang.RuntimeException with the message "File not found."
An error page has been configured for this JSP page.
Which option prevents the exception thrown by my:errorProne from invoking the error page mechanism, and outputs the message "File not found" in the response?

A) <my:errorProne>
<c:catch var="ex">
${ex.message}
</c:catch>
</my:errorProne>
B) <c:try catch="ex">
<my:errorProne />
</c:try>
${ex.message}
C) <c:try>
<my:errorProne />
<c:catch var="ex" />
${ex.message}
</c:try>
D) <c:catch var="ex">
<my:errorProne />
</c:catch>
${ex.message}
E) <c:try>
<my:errorProne />
</c:try>
<c:catch var="ex" />
${ex.message}

3. As a convenience feature, your web pages include an Ajax request every five minutes to a special servlet that monitors the age of the user's session. The client-side JavaScript that handles the Ajax callback displays a message on the screen as the session ages. The Ajax call does NOT pass any cookies, but it passes the session ID in a request parameter called sessionID. In addition, assume that your webapp keeps a hashmap of session objects by the ID. Here is a partial implementation of this servlet:
10.
public class SessionAgeServlet extends HttpServlet {
11.
public void service(HttpServletRequest request, HttpServletResponse) throws IOException {
12.
String sessionID = request.getParameter("sessionID");
13.
HttpSession session = getSession(sessionID);
14.
long age = // your code here
15.
response.getWriter().print(age);
16.
}
... // more code here
47. }
Which code snippet on line 14, will determine the age of the session?

A) session.getLastAccessedTime() - session.getCreationTime();
B) session.getMaxInactiveInterval() - session.getCreationTime();
C) session.getLastAccessedTime().getTime() - session.getCreationTime().getTime();
D) session.getMaxInactiveInterval();
E) session.getLastAccessed().getTime() - session.getCreationTime().getTime();
F) session.getLastAccessed() - session.getCreationTime();

4. A developer for the company web site has been told that users may turn off cookie support in their browsers. What must the developer do to ensure that these customers can still use the web application?

A) The developer must add the string ?id=<sessionid> to the end of every URL to ensure that the conversation with the browser can continue.
B) The developer must ensure that every URL is properly encoded using the appropriate URL rewriting APIs.
C) The developer can ignore this issue. Web containers are required to support automatic URL rewriting when cookies are not supported.
D) The developer must provide an alternate mechanism for managing sessions and abandon the HttpSession mechanism entirely.

5. You are writing a JSP that includes scriptlet code to declare a List variable and initializes that variable to an ArrayList object. Which two JSP code snippets can you use to import these list types? (Choose two.)

A) <%@ page import='java.util.List,java.util.ArrayList' %>
B) <%@ import types='java.util.List,java.util.ArrayList' %>
C) <%@ page import='java.util.List'
import='java.util.ArrayList' %>
D) <%! import java.util.List; import java.util.ArrayList; %>
E) <%@ import types='java.util.List' types='java.util.ArrayList' %>
F) <%! import java.util.*; %>

Solutions: