Logperience

CMA Hackathon in News

2013-12-17T20:00:00.000+05:30

CMA Hackathon in News

http://www.thehindubusinessline.com/news/states/cma-to-try-crowdsourcing-for-better-urban-governance/article5430102.ece

http://www.deccanchronicle.com/131216/news-current-affairs/article/jaya%E2%80%99s-2023-vision-gets-white-hat-support

http://www.newindianexpress.com/cities/chennai/An-app-t-solution-for-every-issue/2013/12/16/article1947032.ece

http://www.thehindu.com/news/cities/chennai/techies-develop-apps-for-urban-governance/article5463312.ece

Hibernate - JNDI Configuration

2013-08-09T12:34:00.000+05:30

First some points about JNDI:

It maps an object with a name.
It requires an Application Server.

Scenarios:

Hibernate can use the datasource created by JNDI for making connection with the database. This makes Hibernate free of knowledge about the database connection.
Hibernate can manage the connection with the database and use JNDI for mapping the SessionFactory object, so that the SessionFactory can be accessed from any part of the application.
Combination of the above two. Hibernate can use the datasource created by JNDI for making connection with the database and map the SessionFactory object.

HOW TO

Here I used Eclipse Kepler, JBoss Application Server 7.1.1, MySQL.

Scenario 1:

Create folder under JBoss AS directory with following address modules\com\mysql\main. Goto the main directory.
Copy and paste the database-java connector(JDBC) jar file. I used mysql-connector-java-5.1.18-bin.jar
Create module.xml with following contents.

Open standalone.xml file under standalone\configuration in JBoss AS directory.
Add the following under <drivers> in <datasources> element.

Add the following under <datasources> element.

Create or Edit web.xml of your project so that it has following content.

Edit hibernate.cfg.xml.

To access the connection in your application.

Scenario 2:

In hibernate.cfg.xml file change <session-factory> to <session-factory name="SessionFactory">
Have this in a start up code.

To access the SessionFactory,

Sample Code:

Scenario 3:

Just the Combination of the above two scenarios.

Cracking the ThoughtWorks interview

2013-01-07T20:07:00.002+05:30

This my experience about the ThoughtWorks interview which I cracked. . When I was in third year, I was selected for the selection process of “Fellowship program” (something like internship). I have written my experience about this in THIS post.

During my fourth year, I got a mail from college regarding the visit of TW for the recruitment process. To tell the truth I didn’t prepare much for the interview. On the day ThoughtWorkers came to our college. The first round started by around 11.30 A.M. The results came around 2.00 P.M. The second round started by 2.30 P.M.

Day 1

Pre Placement Talk – PPT
Aptitude round
Coding round

Aptitude round is a very simple. It is not like the general aptitude we all have heard. It just checks your concentration and logical thinking. You can google to get one set of questions of this round.

Those who cleared aptitude were divided into 3 batches. Batch 1 had students who scored low in aptitude. They had a qualifying round. In that they asked to write a program to print an inverted triangle. Those who cleared it were joined with batch 2 and 3. Batch 2 got ipod problem and batch 3 got hotel problem.

You can google to get these questions too.

Hint: The program should be a generalized one. It should work even if they change any values in the problem(like cost of ipod). It must use OOP concepts.

Day 2

They ask for a copy of your resume. They never saw my certificates.(Still carry them in a file). After each round they attach the feedback of the interviewer with your resume.(I feel that their final decision depends on our performance in each round).

Technical round 1
Technical round 2
Technical round 3
They gave me a paper having different characters. They asked me to tick the character that I’m and what others want me to be.
General aptitude.

Technical 1[50 minutes]

What are the entities present in the TGMC project that you did and draw the entity diagram.[TGMC project]
Design the table for the department and complaint.[TGMC project]
Write a query to get departments that have no complaint filed.[TGMC project][I gave a solution using NOT IN. They asked me to give another solution]

DepartmentID

DepartmentName

ComplaintID

Complaint

DepartmentID

Design database tables for social networking site like Facebook that has options of sending friend request, posting on friends wall.
In operating system like Linux, which class should have the method for checking whether a user has permission to access a file?[I said File class and they said Role class. We argued for nearly 5 minutes]
Different types of users in Linux.
Which data structure is used to keep track of the order in which the functions are called?
What are the applications of stack?

Technical 2[1 hour]

“25 horses 5 tracks” puzzle.[Google it for solution.]
A building has 10 floors. There are 6 lift. Each floor has two buttons to specify the direction. When a button is pressed any one of the six lift must come. Design classes for this scenario and write algorithm.[When I gave a solution they complicated the question, like to consider the direction of the lift, what if a lift is idle]
A stream of numbers is generated for 3 hour. One number is alone repeated for odd number of times. How will you find that number?
OOPs concept.
What is data abstraction?
What is encapsulation?
Actions that take place when google.com is typed in a web browser.
Have you contributed to open source?
Difference between DTD and XSL.
Why is JQuery popular?

Technical 3[45 minutes]

Design a table for a search engine like google.[when I gave solution using DBMS, they asked for other solutions without using DBMS]
Sum of n numbers without using loop.[use recursive function]
Print the nodes from leaf node to parent node.[I gave a solution using postfix. They asked me to use loop instead of recursive function]
Tell me about yourself
Why you want to join ThoughtWorks?

Most of these questions were based on what is there in my resume.

The duration for each round varies for each student. For some it went even for 2 hour.

For each round there will be 2 interviewers. First they give handshake and introduce themselves. They ask the questions. They check how we think to get the answer. Try to apply OOPs, data structure. There is no correct answer for the questions that they ask. If you don’t know the answer, tell them directly. Finally they ask whether you have any question for them.

HR

Tell about your family.
What you want to achieve.
Any idea of higher studies.

Around 800 students attended the aptitude round. Around 80 cleared it and attended the coding round. 17 attended the Technical 1. 5 attended Technical 2. Only I attended Technical 3 and HR. (Till now I don’t know why there a Technical 3 round). This is the first interview that I have ever faced and I feel very happy that I cracked it.

After 4 months I came to know that ThoughtWorks interview process is ranked as 6th most difficult interview.

ThoughtWorks Fellowship program

2013-01-07T20:01:00.000+05:30

TW selected top 30 students for the selection process. First they asked us to mail our previous experience like what projects have you done, what you learnt from it, what mistakes you made. Based on this, they selected students for the next round. It was a coding round. They mailed us a scenario and asked to write a program for it. Those who cleared this were asked to come to their campus. There they asked us to do some modifications in our code that we wrote for the previous round. I made some logical mistakes and I didn’t get selected for the next rounds. The next rounds were Technical.

Simple mistakes are hard to find

2013-01-07T19:59:00.000+05:30

Two days back, I was breaking my head to find the error in my project. It was not any logical or syntactic error. The server was responding with a HTTP 404 error. It means that the page I requested was not found. After 1.5 hours of struggle I found that I made a simple error by creating the JSP file in the WEB-INF folder of my project instead of creating it in the WebContent folder. The server replied that the resource is not found. Usually I like to crack errors(whatever type they may be), but at some point of time I get frustrated. At last, when you solve the error and you find that it was a silly and careless mistake, you will really feel like kicking yourself. I would like to add a point that this is the project that I’m going to submit as my undergraduate degree project. And this is the first time I’m working in JBoss server. Till now all my JSP projects were based on Web Sphere Application Server.

The Game

2012-12-27T21:36:00.000+05:30

In this blog i'm going to share my experience in the game called LIFE. I hope that my experience will help other players who are playing this game. Any important update about this game will be logged and labelled with "The Game". When possible i will also log my past experience.

Game Status
Current Level: 20

Viewing the code of Google Chrome extension written by others

2012-12-20T20:57:00.000+05:30

Very boring. Want to do something…. After thinking for long time, decided to create extension for Google Chrome browser. But how to create an extension?? Very easy.. Google It. After skimming through their developers website I found that it is not much to do with programming. Just JSON and HTML (including JavaScript). In this post I’m not going to tell how to create an extension because already many tutorials are available in the web. I’m going to tell now to view the extensions written by others.

Task : Viewing the code of Google Chrome extension written by others

OS : Windows 7 Home Premium

Google Chrome browser version: 23.0.1271.97 m

Step 1: Set your folder options so that you can see hidden folders.

Step 2: Navigate to

C:\Users\{User name}\AppData\Local\Google\Chrome\User Data\Default\Extensions

Note : There may be some minor change in the location of the folder in other OS of Windows. Have no idea for Mac and Linux.

Step 3: There you can see many folders(if you have installed extensions). Each folder represents an extension. The extension ID is used as the folder name.

Step 4: In Google Chrome go to the settings page. In the side bar, select “Extensions”. It displays the list of installed extensions. Now check the “Developer Mode” option to view the ID of each extension.

Step 5: That’s it!! Now using the ID of the extension for which you want to view the code, you can select the folder.

Its always better to learn from others coding.

First post

2012-12-19T19:32:00.001+05:30

After trying lot of addresses for this blog. Final choose one!!