CA

[vista]

DOES ANYONE KNOW THE PATTERN OF CA

[sowmya571]

hi





FRESHERS WORLD [/b]





COMPANY NAME : Computer Associates,
Hyderabad

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DATE OF TEST : 15 Feb 2004, Sunday

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PLACE OF TEST: BalaVidyaMandir, Adyar, Chennai

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MODE : Off-Campus

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DURATION :



Test Pattern:

Paper1: 40 J2EE Questions (50 minutes)

Paper2: 40 JAVA Questions (50 minutes)



All questions are multiple-choice !





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J2EE PAPER:

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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 <jsp:forward> 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 <jsp:plugin> 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 :



<jsp:plugin

type="bean|applet"

code="classFileName"

codebase="classFileDirectoryName"

[ name="instanceName" ]

[ archive="URIToArchive, ..." ]

[ align="bottom|top|middle|left|right" ]

[ height="displayPixels" ]

[ width="displayPixels" ]

[ hspace="leftRightPixels" ]

[ vspace="topBottomPixels" ]

[ jreversion="JREVersionNumber | 1.1" ]

[ nspluginurl="URLToPlugin" ]

[ iepluginurl="URLToPlugin" ] >



[ <jsp:params>

[ <jsp:param name="parameterName" value="parameterValue"
/> ]+

</jsp:params> ]



[ <jsp:fallback> text message for user </jsp:fallback> ]









Description :

The <jsp:plugin> tag is replaced by either anor tag, whichever is most
appropriate for the client Web browser (the tag is for browsers that use HTML
4.0).



The <jsp:params> element sends parameter names and values to an applet or
Bean at startup. The <jsp:fallback> 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 <jsp:plugin> tag takes most of its attributes from the HTML tags (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
<jsp:plugin> 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 <jsp:plugin> 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.



<jsp:params> [ <jsp:param name="parameterName"
value="parameterValue" /> ]+ </jsp:params>



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



<jsp:fallback> text message for user </jsp:fallback>



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







Example:



The <jsp:plugin> directive takes care of generating all the HTML code
necessary to embed and activate a Java applet.

Consider the following example:

-----------

<html> <head> </head> <body>



<jsp:plugin type="applet" code="NewsTicker.class"
name="newsticker" height="100"
width="100">



<jsp:params>

<jsp:param name="x" value="10"/>

<jsp:param name="y" value="25"/>

</jsp:params>



<jsp:fallback>Oops! Something bad happened and I can't display this applet</jsp:fallback>







</body>

</html>

-----------

The code above sets up the applet contained in "NewsTicker.class",
and passes it a bunch of name-value pairs of parameters. The <jsp:param>
tag is used to pass these parameters to the applet, while the <jsp:fallback>
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.



<html> <head> </head> <body>







</body>

</html>

-----------





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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.



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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.





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




ALL THE BEST



BYE



SOWMYA

[sowmya571]

hi



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bye