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

1. Given that a web application consists of two HttpServlet classes, ServletA and ServletB, and the ServletA.service method:
20. String key = "com.example.data";
21. session.setAttribute(key, "Hello");
22. Object value = session.getAttribute(key);
23.
Assume session is an HttpSession, and is not referenced anywhere else in ServletA.
Which two changes, taken together, ensure that value is equal to "Hello" on line 23?
(Choose two.)

A) ensure that ServletB synchronizes on the session object when setting session attributes
B) ensure that the ServletA.service method is synchronized
C) ensure that the ServletB.service method is synchronized
D) enclose lines 21-22 in a synchronized block:
synchronized(this) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}
E) enclose lines 21-22 in a synchronized block:
synchronized(session) {
session.setAttribute(key, "Hello");
value = session.getAttribute(key);
}

2. You have created a servlet that generates weather maps. The data for these maps is calculated by a remote host. The IP address of this host is usually stable, but occasionally does have to change as the corporate network grows and changes. This IP address used to be hard coded, but after the fifth change to the IP address in two years, you have decided that this value should be declared in the deployment descriptor so you do NOT have the recompile the web application every time the IP address changes. Which deployment descriptor snippet accomplishes this goal?

A) <serlvet-param>
< name>WeatherServlet.hostIP</name>
< value>127.0.4.20</value>
< /servlet-param>
B) <init-param>
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /init-param>
C) <init-param>
< name>WeatherServlet.hostIP</name>
< value>127.0.4.20</value>
< /init-param>
D) <serlvet-param>
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /servlet-param>
E) <servlet>
< !-- servlet definition here -->
< param-name>WeatherServlet.hostIP</param-name>
< param-value>127.0.4.20</param-value>
< /servlet>

3. Your management has required that all JSPs be created to generate XHTML-compliant content and to facilitate that decision, you are required to create all JSPs using the JSP
Document format. In the reviewOrder.jspx page, you need to use several core JSTL tags to process the collection of order items in the customer's shopping cart. Which JSP code snippets must you use in the reviewOrder.jspx page?

A) <html xmlns:jsp="http://java.sun.com/JSP/Page"
version="2.0">
< jsp:directive.taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" />
< !-- page content -->
< /html>
B) <html xmlns:jsp="http://java.sun.com/JSP/Page"
version="2.0"
xmlns:c="http://java.sun.com/jsp/jstl/core">
< !-- page content -->
< /html>
C) <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
version="2.0"
xmlns:c="http://java.sun.com/jsp/jstl/core">
< !-- page content -->
< /jsp:root>
D) <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
version="2.0">
< jsp:directive.taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" />
< !-- page content -->
< /jsp:root>

4. The tl:taskList and tl:task tags output a set of tasks to the response and are used as follows:
1 1. <tl:taskList>
1 2. <tl:task name="Mow the lawn" />
1 3. <tl:task name="Feed the dog" />
1 4. <tl:task name="Do the laundry" />
1 5. </tl:taskList>
The tl:task tag supplies information about a single task while the tl:taskList tag does the final output. The tag handler for tl:taskList is TaskListTag. The tag handler for tl:task is
TaskTag. Both tag handlers extend BodyTagSupport.
Which allows the tl:taskList tag to get the task names from its nested tl:task children?

A) Create an addTaskName method in TaskListTag. Have the TaskListTag.doStartTag method, return BodyTag.EVAL_BODY_BUFFERED. In the TaskTag.doStartTag method, call findAncestorWithClass() on the PageContext, passing TaskListTag as the class to find.
Cast the result to TaskListTag and call addTaskName().
B) In the TaskListTag.doStartTag method, call super.getChildTags() and iterate through the results. Cast each result to a TaskTag and call getName().
C) In the TaskListTag.doStartTag method, call getChildTags() on the PageContext and iterate through the results. Cast each result to a TaskTag and call getName().
D) Create an addTaskName method in TaskListTag. Have the TaskListTag.doStartTag method, return BodyTag.EVAL_BODY_BUFFERE In the TaskTag.doStartTag method, call super.getParent(), cast it to a TaskListTag, and call addTaskName().
E) It is impossible for a tag handler that extends BodyTagSupport to communicate with its parent and child tags.

5. Which two statements are true about using the isUserInRole method to implement security in a Java EE application? (Choose two.)

A) It can be used independently of the getRemoteUser method.
B) Can return "true" even when its argument is NOT defined as a valid role name in the deployment descriptor.
C) Using the isUserInRole method overrides any declarative authorization related to the method in which it is invoked.
D) Using the isUserInRole method overrides any declarative authentication related to the method in which it is invoked.
E) It can be invoked only from the doGet or doPost methods.

Solutions: