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

1. A developer is designing a multi-tier web application and discovers a need to hide the details of establishing and maintaining remote communications from the client. In addition, because the business and resource tiers are distributed, the application needs to minimize the inter-tier network traffic related to servicing client requests. Which design patterns, working together, address these issues?

A) Front Controller and Transfer Object
B) Front Controller and Service Locator
C) Model-View-Controller and Intercepting Filter
D) Business Delegate and Intercepting Filter
E) Business Delegate and Transfer Object

2. Which element of the web application deployment descriptor defines the servlet class associated with a servlet instance?

A) <webapp>
B) <servlet-mapping>
C) <class>
D) <servlet-class>
E) <servlet>
F) <codebase>

3. Servlet A forwarded a request to servlet B using the forward method of RequestDispatcher.
What attribute in B's request object contains the URI of the original request received by servlet A?

A) javax.servlet.forward.request_uri
B) REQUEST_URI
C) javax.servlet.request_dispatcher.REQUEST_URI
D) javax.servlet.forward.REQUEST_URI
E) javax.servlet.request_dispatcher.request_uri

4. Which is true about the web container request processing model?

A) The init method on a filter is called the first time a servlet mapped to that filter is invoked.
B) A filter defined for a servlet must always forward control to the next resource in the filter chain.
C) If the init method on a filter throws an UnavailableException, then the container will make no further attempt to execute it.
D) Filters associated with a named servlet are applied in the order they appear in the web application deployment descriptor file.

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

Solutions: