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Oracle Java Enterprise Edition 5 Web Component Developer Certified Professional Sample Questions:

1. Your web application uses a simple architecture in which servlets handle requests and then forward to a JSP using a request dispatcher. You need to pass information calculated in the servlet to the JSP for view generation. This information must NOT be accessible to any other servlet, JSP or session in the webapp. Which two techniques can you use to accomplish this goal? (Choose two.)

A) Add parameters to the request object.
B) Add parameters to the JSP's URL when generating the request dispatcher.
C) Add attributes on the request object.
D) Use the pageContext object to add request attributes.
E) Add attributes to the session object.

2. Which interface must a session attribute implement if it needs to be notified when a web container persists a session?

A) javax.servlet.http.HttpSessionAttributeListener
B) javax.servlet.http.HttpSessionListener
C) javax.servlet.http.HttpSessionActivationListener
D) javax.servlet.http.HttpSessionBindingListener

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

4. You are creating a new JSP page and you need to execute some code that acts when the page is first executed, but only once. Which three are possible mechanisms for performing this initialization code? (Choose three.)

A) In the constructor of the JSP's Java code.
B) In a JSP declaration, which includes a static initializer block.
C) In the jspInit method.
D) In the init method.
E) In a JSP declaration, which includes an initializer block.

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

Solutions: