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

1. Squeaky Beans Inc. hired an outside consultant to develop their web application. To finish the job quickly, the consultant created several dozen JSP pages that directly communicate with the database. The Squeaky business team has since purchased a set of business objects to model their system, and the Squeaky developer charged with maintaining the web application must now refactor all the JSPs to work with the new system. Which pattern can the developer use to solve this problem?

A) Business Delegate
B) Transfer Object
C) Service Locator
D) Intercepting Filter

2. You need to create a JavaBean object that is used only within the current JSP page. It must NOT be accessible to any other page including those that this page might import.
Which JSP standard action can accomplish this goal?

A) <jsp:useBean id='pageBean' class='com.example.MyBean' />
B) <jsp:makeBean id='pageBean' class='com.example.MyBean' />
C) <jsp:makeBean name='pageBean' class='com.example.MyBean' />
D) <jsp:useBean name='pageBean' class='com.example.MyBean' />
E) <jsp:makeBean id='pageBean' type='com.example.MyBean' />
F) <jsp:useBean id='pageBean' type='com.example.MyBean' />

3. 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) It is impossible for a tag handler that extends BodyTagSupport to communicate with its parent and child tags.
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_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().
E) 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().

4. You are designing an n-tier Java EE application. You have already decided that some of your JSPs will need to get data from a Customer entity bean. You are trying to decide whether to use a Customer stub object or a Transfer Object. Which two statements are true? (Choose two.)

A) The stub will increase the logic necessary in the JSPs.
B) The Transfer Object will decrease data staleness.
C) In both cases, the JSPs can use EL expressions to get data.
D) Using the stub approach allows you to design the application without using a Service
Locator.
E) Only the Transfer Object will need to use a Business Delegate.
F) The stub will increase network traffic.

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

Solutions: