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

1. You need to create a servlet filter that stores all request headers to a database for all requests to the web application's home page "/index.jsp". Which HttpServletRequest method allows you to retrieve all of the request headers?

A) java.util.Iterator getRequestHeaders()
B) java.util.Enumeration getRequestHeaders()
C) String[] getRequestHeaders()
D) String[] getHeaderNames()
E) java.util.Enumeration getHeaderNames()
F) java.util.Iterator getHeaderNames()

2. Given the definition of MyServlet:
1 1. public class MyServlet extends HttpServlet {
1 2. public void service(HttpServletRequest request,
1 3. HttpServletResponse response)
1 4. throws ServletException, IOException {
1 5. HttpSession session = request.getSession();
1 6 session.setAttribute("myAttribute","myAttributeValue");
1 7. session.invalidate();
1 8. response.getWriter().println("value=" +
1 9. session.getAttribute("myAttribute"));
2 0. }
2 1. }
What is the result when a request is sent to MyServlet?

A) An IllegalStateException is thrown at runtime.
B) An InvalidSessionException is thrown at runtime.
C) The string "value=myAttributeValue" appears in the response stream.
D) The string "value=null" appears in the response stream.

3. Given the element from the web application deployment descriptor:
< jsp-property-group>
< url-pattern>/main/page1.jsp</url-pattern>
< scripting-invalid>true</scripting-invalid>
< /jsp-property-group>
and given that /main/page1.jsp contains:
< % int i = 12; %>
< b><%= i %></b>
What is the result?

A) The JSP fails to execute.
B) <% int i = 12 %>
< b><%= i %></b>
C) <b></b>
D) <b>12</b>

4. Your web application requires the adding and deleting of many session attributes during a complex use case. A bug report has come in that indicates that an important session attribute is being deleted too soon and a NullPointerException is being thrown several interactions after the fact. You have decided to create a session event listener that will log when attributes are being deleted so you can track down when the attribute is erroneously being deleted.
Which listener class will accomplish this debugging goal?

A) Create an SessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getAttributeName method on the event object.
B) Create an HttpSessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getName method on the event object.
C) Create an SessionAttributeListener class and implement the attributeDeleted method and log the attribute name using the getAttributeName method on the event object.
D) Create an HttpSessionAttributeListener class and implement the attributeRemoved method and log the attribute name using the getName method on the event object.

5. Which two statements are true about the security-related tags in a valid Java EE deployment descriptor? (Choose two.)

A) It is possible to construct a valid <security-constraint> tag such that, for a given resource, no user roles can access that resource.
B) A <security-constraint> tag can have many <web-resource-collection> tags.
C) A given <auth-constraint> tag can apply to only one <web-resource-collection> tag.
D) Every <security-constraint> tag must have at least one <http-method> tag.
E) A given <web-resource-collection> tag can contain from zero to many <url-pattern> tags.

Solutions: