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

1. DRAG DROP
Click the Task button.
Given a servlet mapped to /control, place the correct URI segment returned as a String on the corresponding HttpServletRequest method call for the URI:
/myapp/control/processorder.

2. You are creating a library of custom tags that mimic the HTML form tags. When the user submits a form that fails validation, the JSP form is forwarded back to the user. The
< t:textField> tag must support the ability to re-populate the form field with the request parameters from the user's last request. For example, if the user entered "Samantha" in the text field called firstName, then the form is re-populated like this:
< input type='text' name='firstName' value='Samantha' />
Which tag handler method will accomplish this goal?

A) public int doStartTag() throws JspException {
JspContext ctx = getJspContext();
String value = ctx.getParameter(this.name);
if ( value == null ) value = "";
JspWriter out = pageContext.getOut();
try {
out.write(String.format(INPUT, this.name, value));
} (Exception e) { throw new JspException(e); }
return SKIP_BODY;
}
private static String INPUT
= "<input type='text' name='%s' value='%s' />";
B) public void doTag() throws JspException {
ServletRequet request = pageContext.getRequest();
String value = request.getParameter(this.name);
if ( value == null ) value = "";
JspWriter out = pageContext.getOut();
try {
out.write(String.format(INPUT, this.name, value));
} (Exception e) { throw new JspException(e); }
}
private static String INPUT
= "<input type='text' name='%s' value='%s' />";
C) public int doStartTag() throws JspException {
ServletRequet request = pageContext.getRequest();
String value = request.getParameter(this.name);
if ( value == null ) value = "";
JspWriter out = pageContext.getOut();
try {
out.write(String.format(INPUT, this.name, value));
} (Exception e) { throw new JspException(e); }
return SKIP_BODY;
}
private static String INPUT
= "<input type='text' name='%s' value='%s' />";
D) public void doTag() throws JspException {
JspContext ctx = getJspContext();
String value = ctx.getParameter(this.name);
if ( value == null ) value = "";
JspWriter out = pageContext.getOut();
try {
out.write(String.format(INPUT, this.name, value));
} (Exception e) { throw new JspException(e); }
}
private static String INPUT
= "<input type='text' name='%s' value='%s' />";

3. DRAG DROP
Click the Task button.
Place the code snippets in the proper order to construct the JSP code to import static content into a JSP page at translation-time.

4. Given:
3 . public class MyTagHandler extends TagSupport {
4 . public int doStartTag() {
5 . // insert code here
6 . // return an int
7 . }
8 . // more code here
...
18. }
There is a single attribute foo in the session scope.
Which three code fragments, inserted independently at line 5, return the value of the attribute? (Choose three.)

A) Object o = pageContext.getAttribute("foo");
B) Object o = pageContext.getAttribute("foo",
PageContext.SESSION_SCOPE);
C) HttpServletRequest r = pageContext.getRequest();
Object o = r.getAttribute("foo");
D) Object o = pageContext.findAttribute("foo");
E) HttpSession s = pageContext.getSession();
Object o = s.getAttribute("foo");

5. For manageability purposes, you have been told to add a "count" instance variable to a critical JSP Document so that a JMX MBean can track how frequent this JSP is being invoked. Which JSP code snippet must you use to declare this instance variable in the JSP
Document?

A) <%! int count = 0; %>
B) <jsp:declaration.instance>
int count = 0;
< jsp:declaration.instance>
C) <jsp:scriptlet.declaration>
int count = 0;
< jsp:scriptlet.declaration>
D) <jsp:declaration>
int count = 0;
< jsp:declaration>

Solutions: