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

1. You want to create a filter for your web application and your filter will implement javax.servlet.Filter.
Which two statements are true? (Choose two.)

A) Your filter class must implement an init method and a destroy method.
B) Your filter class must implement a doFilter method that takes, among other things, an
HTTPServletRequest object and an HTTPServletResponse object.
C) Your filter class must also implement javax.servlet.FilterChain.
D) When your filter chains to the next filter, it should pass the same arguments it received in its doFilter method.
E) The method that your filter invokes on the object it received that implements javax.servlet.FilterChain can invoke either another filter or a servlet.

2. Given a web application in which the request parameter productID contains a product identifier. Which two EL expressions evaluate the value of the productID? (Choose two.)

A) ${pageContext.request.productID}
B) ${productID}
C) ${paramValues.productID}
D) ${params.productID[1]}
E) ${paramValues.productID[0]}
F) ${param.productID}
G) ${params.productID}

3. Given:
1 . <% int[] nums = {42,420,4200};
2 . request.setAttribute("foo", nums); %>
3 . ${5 + 3 lt 6}
4 . ${requestScope['foo'][0] ne 10 div 0}
5 . ${10 div 0}
What is the result?

A) false true Infinity
B) true true Infinity
C) An exception is thrown.
D) false true
E) false true 0
F) Compilation or translation fails.
G) true true

4. Given an HttpServletRequest request:
2 2. String id = request.getParameter("jsessionid");
2 3. // insert code here
2 4. String name = (String) session.getAttribute("name");
Which three can be placed at line 23 to retrieve an existing HttpSession object? (Choose three.)

A) HttpSession session = request.getSession();
B) HttpSession session = request.getSession(id);
C) HttpSession session = request.getSession(true);
D) HttpSession session = request.getSession(false);
E) HttpSession session = request.getSession("jsessionid");

5. Click the Exhibit button. Given the web application deployment descriptor elements:
1 1. <filter>
1 2. <filter-name>ParamAdder</filter-name>
1 3. <filter-class>com.example.ParamAdder</filter-class>
1 4. </filter>
...
3 1. <filter-mapping>
3 2. <filter-name>ParamAdder</filter-name>
3 3. <servlet-name>Destination</servlet-name>
3 4. </filter-mapping>
...
5 5. <servlet-mapping>
5 6. <servlet-name>Destination</servlet-name>
5 7. <url-pattern>/dest/Destination</url-pattern>
5 8. </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) The output "filterAdded = null" is written to the response stream.
C) The output "filterAdded = addedByFilter" is written to the response stream.
D) An exception is thrown at runtime within the service method of the Destination servlet.

Solutions: