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

1. Given:
1 0. public void service(ServletRequest request,
1 1. ServletResponse response) {
1 2. ServletInputStream sis =
1 3. // insert code here
1 4. }
Which retrieves the binary input stream on line 13?

A) request.getWriter();
B) request.getReader();
C) request.getResourceAsStream(ServletRequest.REQUEST);
D) request.getInputStream();
E) request.getResourceAsStream();

2. One of the use cases in your web application uses many session-scoped attributes. At the end of the use case, you want to clear out this set of attributes from the session object.
Assume that this static variable holds this set of attribute names:
2 01. private static final Set<String> USE_CASE_ATTRS;
2 02. static {
2 03. USE_CASE_ATTRS.add("customerOID");
2 04. USE_CASE_ATTRS.add("custMgrBean");
2 05. USE_CASE_ATTRS.add("orderOID");
2 06. USE_CASE_ATTRS.add("orderMgrBean");
207. }
Which code snippet deletes these attributes from the session object?

A) for ( String attr : USE_CASE_ATTRS ) {
session.deleteAttribute(attr);
}
B) for ( String attr : USE_CASE_ATTRS ) {
session.remove(attr);
}
C) for ( String attr : USE_CASE_ATTRS ) {
session.removeAttribute(attr);
}
D) session.deleteAllAttributes(USE_CASE_ATTRS);
E) session.removeAll(USE_CASE_ATTRS);

3. What is the purpose of session management?

A) To store information on the client-side between HTTP requests.
B) To store information on the server-side between HTTP requests.
C) To manage the user's login and logout activities.
D) To tell the web container to keep the HTTP connection alive so it can make subsequent requests without the delay of making the TCP connection.

4. Given:
1 1. <% java.util.Map map = new java.util.HashMap();
1 2. request.setAttribute("map", map);
1 3. map.put("a", "b");
1 4. map.put("b", "c");
1 5. map.put("c", "d"); %>
1 6. <%-- insert code here --%>
Which three EL expressions, inserted at line 16, are valid and evaluate to "d"? (Choose three.)

A) ${map.(map.b)}
B) ${map.c}
C) ${map[map.b]}
D) ${map[c]}
E) ${map.map.b}
F) ${map["c"]}

5. 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 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' />";
B) 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' />";
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' />";

Solutions: