Computer Associates Placement Papers

15. Difference between <jsp:forward> and <jsp:include> tags

ANS:
<jsp:forward> transfers the control to the mentioned destination page.
<jsp:include> tag substitutes the output of the destination page. Control remains on the same page.

16. Which of the following is true ?

(a) Unlimited data transfer can be done using POST method
(b) Data is visible in Browser URL when using POST method
(c) When large amounts of data transfer is to be done, GET method is used.

ANS: (a)

17. EJB class should implement

(a) javax.ejb.EntityBean
(b) javax.ejb.rmi
(c) javax.ejb.EJBHome
(d) javax.ejb.EJBObject

ANS: I think the answer is (a)

18. Generally Servlets are used for complete HTML generation. If you want to generate partial HTMLs that include some static text (This should not be hard coded in Servlets) as well as some dynamic text, what method do you use ?

(a) Serverside includes
(b) JSP code in HTML
(c) Not possible to generate incomplete HTMLs using Servlets

(Note: I don't remember the question word to word. But it is similar to what I have given)

19. Which of the following can not be used as the scope when using a JavaBean with JSP?

(a) session
(b) application
(c) request
(d) response

ANS: (d)

20. Which is true about Servlets

(a) Only one instance of Servlet is created in memory
(b) Multi-Threading is used to service multiple requests
(c) Both (a) & (b)

ANS: I think the answer is (c)

21. What is Temporary Servlet ?

(a) Servlet that is destroyed at run time
(b) Servlet that exists for a session
(c) Servlet that is started and stopped for each request

ANS: (c)

EXPLANATION:
A temporary servlet is started when a request arrives and shut down after the response is generated.

A permanent servlet is loaded when the server is started and lives until the server is shut down.
* This is useful when startup costs are high, such as a servlet that establishes a connection to a database.
* Also useful for permanent server-side service, such as an RMI server.
* Provides faster response to client requests when this is crucial.

Being temporary or permanent is part of the server configuration.

22. Although it is not commonly done, what will you do if you want to have multiple instances of Servlet in memory and if they have to share the execution of a user request ?

(a) Defnie Single Thread model
(b) Cannot be done

(Note: I don't remember the question & answers word to word. But it is similar to what I have given)

23. In WebLogic 5.1, how can you make a JSP application work

(a) By changing the root directory
(b) By creating a vitual directory in Server console
(c) By creating a vitual directory in client console

JAVA PAPER:
I don't remember Java questions because most of them are programs and the outputs are asked.
I should say question are very difficult and confusing when compared to J2EE questions.

You should be thorough with following topics, as most of the questions & programs are from these.

* Threads, Synchronization, Thread Monitors
* AWT & SWING Layouts (Border Layout)
* Try, Catch, Finally
* Switch statements (Some question on "default" option of Switch)
* Java Exceptions
* Scope (Public, Private, protected)
* Inner & Outer classes
* Strings & StringBuffers
* Serialization
* Applets
* Abstract Classes & Interfaces
* Static classes & methods

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