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

1. One of the use cases in your web application uses many session-scoped attributes. At the end of the use case, you want to clear out this set of attributes from the session object.
Assume that this static variable holds this set of attribute names:
2 01. private static final Set<String> USE_CASE_ATTRS;
2 02. static {
2 03. USE_CASE_ATTRS.add("customerOID");
204. USE_CASE_ATTRS.add("custMgrBean");
205. USE_CASE_ATTRS.add("orderOID");
206. USE_CASE_ATTRS.add("orderMgrBean");
207. }
Which code snippet deletes these attributes from the session object?

A) for ( String attr : USE_CASE_ATTRS ) {
session.deleteAttribute(attr);
}
B) session.removeAll(USE_CASE_ATTRS);
C) for ( String attr : USE_CASE_ATTRS ) {
session.removeAttribute(attr);
}
D) session.deleteAllAttributes(USE_CASE_ATTRS);
E) for ( String attr : USE_CASE_ATTRS ) {
session.remove(attr);
}

2. Given a web application in which the cookie userName is expected to contain the name of the user. Which EL expression evaluates to that user name?

A) ${cookie.user.name}
B) ${cookies.get('userName')}
C) ${cookies.userName}[1]
D) ${cookies.userName[0]}
E) ${cookie.userName}
F) ${userName}

3. Which statement is true about web container session management?

A) To activate URL rewriting, the developer must use the
HttpServletResponse.setURLRewriting method.
B) The JSESSIONID cookie is stored permanently on the client so that a user may return to the web application and the web container will rejoin that session.
C) If the web application uses HTTPS, then the web container may use the data on the
HTTPS request stream to identify the client.
D) Access to session-scoped attributes is guaranteed to be thread-safe by the web container.

4. 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] %>';
< % } %>

5. Which ensures that a JSP response is of type "text/plain"?

A) <%@ page contentEncoding="text/plain" %>
B) <%@ page mimeType="text/plain" %>
C) <% response.setMimeType("text/plain"); %>
D) <%@ page pageEncoding="text/plain" %>
E) <% response.setEncoding("text/plain"); %>
F) <%@ page contentType="text/plain" %>

Solutions: