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

1. Your IT department is building a lightweight Front Controller servlet that invokes an application logic object with the interface:
public interface ApplicationController {
public String invoke(HttpServletRequest request)
}
The return value of this method indicates a symbolic name of the next view. From this name, the Front Controller servlet looks up the JSP URL in a configuration table. This URL might be an absolute path or a path relative to the current request. Next, the Front
Controller servlet must send the request to this JSP to generate the view. Assume that the servlet variable request is assigned the current HttpServletRequest object and the variable context is assigned the webapp's ServletContext.
Which code snippet of the Front Controller servlet accomplishes this goal?

A) Dispatcher view
= request.getDispatcher(viewURL);
view.forwardRequest(request, response);
B) Dispatcher view
= context.getDispatcher(viewURL);
view.forwardRequest(request, response);
C) RequestDispatcher view
= context.getRequestDispatcher(viewURL);
view.forward(request, response);
D) RequestDispatcher view
= request.getRequestDispatcher(viewURL);
view.forward(request, response);

2. Which two prevent a servlet from handling requests? (Choose two.)

A) The servlet's init method sets the ServletResponse's content length to 0.
B) The servlet's init method does NOT return within a time period defined by the servlet container.
C) The servlet's init method sets the ServletResponse's content type to null.
D) The servlet's init method returns a non-zero status.
E) The servlet's init method throws a ServletException.

3. Your web application views all have the same header, which includes the <title> tag in the
< head> element of the rendered HTML. You have decided to remove this redundant HTML code from your JSPs and put it into a single JSP called /WEB-INF/jsp/header.jsp.
However, the title of each page is unique, so you have decided to use a variable called pageTitle to parameterize this in the header JSP, like this:
10. <title>${param.pageTitle}<title>
Which JSP code snippet should you use in your main view JSPs to insert the header and pass the pageTitle variable?

A) <jsp:insert page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageTitle' value='Welcome Page' />
< /jsp:insert>
B) <jsp:include file='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:include>
C) <jsp:include page='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:include>
D) <jsp:insert page='/WEB-INF/jsp/header.jsp'>
$ {pageTitle='Welcome Page'}
< /jsp:insert>
E) <jsp:include page='/WEB-INF/jsp/header.jsp'>
< jsp:param name='pageTitle' value='Welcome Page' />
< /jsp:include>

4. In a JSP-centric web application, you need to create a catalog browsing JSP page. The catalog is stored as a List object in the catalog attribute of the webapp's ServletContext object. Which scriptlet code snippet gives you access to the catalog object?

A) <% List catalog = config.getAttribute("catalog"); %>
B) <% List catalog = servletContext.getAttribute("catalog"); %>
C) <% List catalog = context.getAttribute("catalog"); %>
D) <% List catalog = application.getAttribute("catalog"); %>

5. Click the Exhibit button.
Assuming the tag library in the exhibit is imported with the prefix forum, which custom tag invocation produces a translation error in a JSP page?

A) <forum:message from="My Name"
subject="<%= request.getParameter( "subject" ) %>">
My message body.
< /forum:message>
B) <forum:message from="My Name" subject="My Subject" />
C) <forum:message subject="My Subject">
My message body.
< /forum:message>
D) <forum:message from="My Name" subject="${param.subject}">
${param.body}
< /forum:message>
E) <forum:message from="My Name" subject="My Subject">
< %= request.getParameter( "body" ) %>
< /forum:message>

Solutions: