Naresh went through a job interview and said:

1. What exception is thrown when Servlet initialization fails ?

(a) IOException
(b) ServletException
(c) RemoteException

ANS: (b)

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2. How can a Servlet call a JSP error page ?

(a) This capability is not supported.
(b) When the servlet throws the exception, it will automatically be caught by the calling JSP page.
(c) The servlet needs to forward the request to the specific error page URL. The exception is passed along as an attribute named “javax.servlet.jsp.jspException”.
(d) The servlet needs to redirect the response to the specific error page, saving the exception off in a cookie.

ANS: (c)

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3. What is the key difference between using a and HttpServletResponse.sendRedirect()?

(a) forward executes on the client while sendRedirect() executes on the server.
(b) forward executes on the server while sendRedirect() executes on the client.
(c) The two methods perform identically.

ANS: (b)

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4. Why beans are used in J2EE architecture in stead of writing all the code in JSPs ?

(a) Allows separation of roles between web developers and application developers
(b) Allows integration with Content Management tools

ANS: (a)

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5. Why DB connections are not written directly in JSPs ?

(a) Response is slow
(b) Not a standard J2EE architecture
(c) Load Balancing is not possible
(d) All the above
(e) Both (b) and (c)

ANS: I think answer is (e). I am not sure whether response from database is slow just because we include the database access code in JSP page.

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6. How multiple EJB instances are managed ?

(a) Connection Pooling
(b) Caching of EJB instances
(c) EJB Passivation
(d) All the above

ANS: I think answer is (d)

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7. At what stage, the life cycle of a CMP bean can be assumed to be started ?

(a) before ejbCreate() method is executed
(b) after ejbCreate() method is executed
(c) in postCreate() method
(d) after executing ejbStore()

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8. Lot of Questions on “EJB Transactions” and how to manage them.

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9. In JSP, how can you know what HTTP method (GET or POST) is used by client request ?

(a) by using request.getMethod()
(b) by using request.setMethod()
(c) impossible to know

ANS: (a)

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10. What is legal about JSP scriplets

(a) A loop can begin in one Scriptlet and end in another
(b) Statements in Scriptlets should follow Java Syntax
(c) Semicolon is needed at the end of each statement in a Scriptlet
(d) All the above

ANS: (d)

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11. Which method is called first each time a Servlet is invoked ?

(a) Start()
(b) Run()
(c) Servive()
(d) init()

ANS: (d)

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12. The time between Command Execution and Response is called ______

(a) Granularity
(b) Latency
(c) Lag time

ANS: (c)

EXPLANATION:

Latency:
Latency is a measure of the temporal delay. Typically, in xDSL, latency refers to the delay in time between the sending of a unit of data at the originating end of a connection and the reception of that unit at the destination end.
In a computer system, latency is often used to mean any delay or waiting that increases real or perceived response time beyond the response time desired. Within a computer, latency can be removed or “hidden” by such techniques as prefetching (anticipating the need for data input requests) and multithreading, or using parallelism across multiple execution threads.
In networking, the amount of time it takes a packet to travel from source to destination. Together, latency and bandwidth define the speed and capacity of a network.

Granularity:
The extent to which a system contains separate components (like granules). The more components in a system — or the greater the granularity — the more flexible it is.
Granularity is a term often used in parallel processing to indicate independent processes that could be distributed to multiple CPUs. Fine granularity is illustrated by execution of statements or small loop iterations as separate processes; coarse granularity involves subroutines or sets of subroutines as separate processes. The more processes, the “finer” the granularity and the more overhead required to keep track of them. Granularity can also be related to the temporal duration of a “task” at work. It is not only the number of processes but also how much work each process does, relative to the time of synchronization, that determines the overhead and reduces speedup figures.

Lag Time:
Lag Time is the amount of time between making an online request or command and receiving a response. A primary goal of advertising network efficiency is to minimize lag time.

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13. 2 Questions on RMI and EJB related (I don’t reemember them)

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14. Purpose of tag

(a) used to incorporate Java applets into a Web page.
(b) Downloads a plugin to the client Web browser to execute an applet or Bean.
(c) Both (a) & (b)

ANS: (c)

EXPLANATION:

JSP Syntax :

[
[ ]+
]

[ text message for user ]

Description :
The tag is replaced by either an or tag, whichever is most appropriate for the client Web browser (the tag is for browsers that use HTML 4.0).

The element sends parameter names and values to an applet or Bean at startup. The element provides a message for the user if the plugin does not start. If the plugin starts but the applet or Bean does not, the plugin usually displays a popup window explaining the error to the user.

The tag takes most of its attributes from the HTML and tags ( is defined in HTML 3.2 and in HTML 4.0). You may want to refer to the official HTML specifications in which these tags are introduced:

For HTML 3.2: http://www.w3.org/TR/REC-html32.html
For HTML 4.0: http://www.w3.org/TR/REC-html40/

Attributes :

type=”bean|applet”

The type of object the plugin will execute. You must specify either bean or applet, as this attribute has no default value.

code=”classFileName”

The name of the Java class file that the plugin will execute. You must include the .class extension in the name following code. The filename is relative to the directory named in the codebase attribute.

codebase=”classFileDirectoryName”

The absolute or relative path to the directory that contains the applet’s code. If you do not supply a value, the path of the JSP file that calls is used.

name=”instanceName”

A name for the Bean or applet instance, which makes it possible for applets or Beans called by the same JSP file to communicate with each other.

archive=”URIToArchive, …”

A comma-separated list of paths that locate archive files to be preloaded with a class loader located in the directory named in codebase. The archive files are loaded securely, often over a network, and typically improve the applet’s performance.

align=”bottom|top|middle|left|right”

The positioning of the image displayed by the applet or Bean relative to the line in the JSP result page that corresponds to the line in the JSP file containing the tag. The results of the different values are listed below:
bottom Aligns the bottom of the image with the baseline of the text line.
top Aligns the top of the image with the top of the text line.
middle Aligns the vertical center of the image with the baseline of the text line.
left Floats the image to the left margin and flows text along the image’s right side.
right Floats the image to the right margin and flows text along the image’s left side.

height=”displayPixels” width=”displayPixels”

The initial height and width, in pixels, of the image the applet or Bean displays, not counting any windows or dialog boxes the applet or Bean brings up.

hspace=”leftRightPixels” vspace=”topBottomPixels”

The amount of space, in pixels, to the left and right (or top and bottom) of the image the applet or Bean displays. Must be a small nonzero number.

jreversion=”JREVersionNumber|1.1″

The version of the Java Runtime Environment (JRE) the applet or Bean requires. The default value is 1.1.

nspluginurl=”URLToPlugin”

The URL where the user can download the JRE plugin for Netscape Navigator. The value is a full URL, with a protocol name, optional port number, and domain name.

iepluginurl=”URLToPlugin”

The URL where the user can download the JRE plugin for Internet Explorer. The value is a full URL, with a protocol name, optional port number, and domain name.

[ ]+

The parameters and values that you want to pass to the applet or Bean. To specify more than one name and value, use multiple tags within the element. Applets read parameters with the java.applet.Applet.getParameter method.

text message for user

A text message to display for the user if the plugin cannot be started.

Example:

The directive takes care of generating all the HTML code necessary to embed and activate a Java applet.
Consider the following example:
———–

Oops! Something bad happened and I can’t display this applet

———–
The code above sets up the applet contained in “NewsTicker.class”, and passes it a bunch of name-value pairs of parameters. The tag is used to pass these parameters to the applet, while the directive contains error text, in the event that the applet cannot be found or displayed.

When JSP compiles and renders the page, the code above is automatically converted to its HTML equivalent.

Oops! Something bad happened and I can’t display this applet

———–

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15. Difference between and tags

ANS:
transfers the control to the mentioned destination page.
tag substitutes the output of the destination page. Control remains on the same page.

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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)

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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)

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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)

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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)

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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)

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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.

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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)

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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

Amar went through a job interview and said:

1 Why DB connections are not written directly in JSPs ?

(a) Response is slow
(b) Not a standard J2EE architecture
(c) Load Balancing is not possible
(d) All the above
…
2 Why beans are used in J2EE architecture in stead of writing all the code in JSPs ?

(a) Allows separation of roles between web developers and application developers
(b) Allows integ…
(a)
3 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 da…
(a)
4 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
(d)
5 Which method is called first each time a Servlet is invoked ?

(a) Start()
(b) Run()
(c) Servive()
(d) init()
(d)
6 Which is true about Servlets
(a) Only one instance of Servlet is created in memory
(b) MultiThreading is used to service multiple requests
(c) Both (a) & (b)
(c)
7 What topics should I be focussing in java to be successful in this interview at Computer Associates, Hyderabad?
* Threads, Synchronization, Thread Monitors
* AWT & SWING Layouts (Border Layout)
* Try, Catch, Finally
* Switch statements (Some question on “default” option of Switch)
*…
8 What is the key difference between using a and HttpServletResponse.sendRedirect()?

(a) forward executes on the client while sendRedirect() executes on the server.
…
(b)
9 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
(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 star…
10 What is legal about JSP scriplets

(a) A loop can begin in one Scriptlet and end in another
(b) Statements in Scriptlets should follow Java Syntax
(c) Semicolon is needed at the …
(d)

Sumanth went through a job interview and said:

Hi,

I got into CA after three technical and one HR round. The initial round was telephonic, and were mostly questions on Unix and C:

i) Whats a function signature? (Ans: Overloaded functions in C++)

ii) Examples of preprocessor directives – is using namespace a preprocessor directive? (Ans: Preprocessor directives are first decoded, substituted, expanded, by the preprocessor. “using namespace” is not a preprocessor directive is what I answered).

iii) Finding the middle element in a linked list without using the number of elements (Ans: Intialise two pointers. For every single node traversal of p1, move p2 by 2 * the number of nodes traversed by p1, checking for the last element to take care of the case where the number of nodes is odd. When p2 points to NULL, p1 points to the middle element).

iv) Whats the difference between writing a server and writing a client TCP application? (Ans: Servers use socket() -> bind() -> listen() -> accept(), TCP clients use socket() -> connect().

In the II round I was asked questions on differences between processes and threads, why’s a thread lightweight, etc. Also I was asked examples where pointers-to-pointers are used.

In the III round I was asked more on linked lists, like being asked to reverse one. I was also asked to count the number of set bits in a number.

The IV round was mostly on why I wanted to join CA, etc..

Basheer went through a job interview and said:

The following are the questions asked in the Personal interview..

1)
main()
{
}
Without including any code in the body of the main print “Hello World”

2)
write a program to implement a queue using singly linked list.

3)
there are nine balls. Al are of same weight except one. You are
provided with a accurate balance. Wat is the minimum number of
iterations requires to find the culprit.
(ans: 4)

4)
One 5 lt can contains water. U R provided with a 3lt and 2 lt can..
Minimum number of iterations for getting 4 litres in in the big can..
minimum number of iterations to get 1lt in the big can.

5)
two ropes hanging on the ceiling. You are alone in the room and u have
a scissors. You cant reach both the ropes at the same time. How can
you tie the ropes together. Scissors are blunt and can not cut the
rope.
(ans: tie the scissors to a rope and swing it. pull the other rope to
the centre. grab the swinging rope and tie both)

6)
there are nine goats in a square field, always fighting with each
other. To prevent it from fighting, the farmer puts only two squares
within the plot and successfully separates all the goats. How??

7)
How do you think quality assurance done in industries?

Write a query to get rows from three different tables and put it into
a new table.