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

1. Assume that a news tag library contains the tags lookup and item:
lookup Retrieves the latest news headlines and executes the tag body once for each headline. Exposes a NESTED page-scoped attribute called headline of type com.example.Headline containing details for that headline.
item Outputs the HTML for a single news headline. Accepts an attribute info of type com.example.Headline containing details for the headline to be rendered.Which snippet of JSP code returns the latest news headlines in an HTML table, one per row?

A) <table>
< tr>
< td>
< news:lookup />
< news:item info="${headline}" />
< /td>
< /tr>
< /table>
B) <table>
< news:lookup>
< tr>
< td><news:item info="${headline}" /></td>
< /tr>
< /news:lookup>
< /table>
C) <table>
< tr>
< news:lookup>
< td><news:item info="${headline}" /></td>
< /news:lookup>
< /tr>
< /table>
D) <news:lookup />
< table>
< tr>
< td><news:item info="${headline}" /></td>
< /tr>
< /table>

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

3. Assume the scoped attribute priority does NOT yet exist. Which two create and set a new request-scoped attribute priority to the value "medium"? (Choose two.)

A) <c:set var="priority" scope="request">medium</c:set>
B) <c:set var="priority" value="medium" scope="request" />
C) ${priority = 'medium'}
D) <c:set var="priority" value="medium" />
E) <c:set property="priority" scope="request">medium</c:set>
F) ${requestScope['priority'] = 'medium'}
G) <c:set property="priority" value="medium" scope="request" />

4. Given a JSP page:
1 1. <n:recurse>
1 2. <n:recurse>
1 3. <n:recurse>
1 4. <n:recurse />
1 5. </n:recurse>
1 6. </n:recurse>
1 7. </n:recurse>
The tag handler for n:recurse extends SimpleTagSupport.
Assuming an n:recurse tag can either contain an empty body or another n:recurse tag, which strategy allows the tag handler for n:recurse to output the nesting depth of the deepest n:recurse tag?

A) It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags.
B) Create a private non-static attribute in the tag handler class called count of type int initialized to 0. Increment count in the doTag method. If the tag has a body, invoke the fragment for that body. Otherwise, output the value of count.
C) If the tag has a body, invoke the fragment for that body.Otherwise, start a counter at 1.
Call getParent(). If it returns null, output the value of the counter Otherwise, increment the counter and continue from where getParent() is called.
D) Start a counter at 1. Call getChildTags(). If it returns null, output the value of the counter.
Otherwise, increment counter and continue from where getChildTags() is called. Skip processing of the body.

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

Solutions: