Ananth Chellathurai's walk on software

How to find IP address in mac

2014-03-12T19:50:00.002-07:00

How to find internal IP address in mac 1. Click on the apple icon on the upper left corner. 2. Click on System Preferences. 3. Click on Network under Internet & Wireless. 4. Your IP address will be listed next to your connection status.

Getting started with RESTful webservice using Jersey

2014-03-10T20:04:00.002-07:00

Jersey helps developing RESTful webservices seamlessly and makes your life easy. This article gives you a quick start on how to create your first RESTful web service using Jersey & Maven. I assume you have a decent understanding of maven and J2EE. Make sure you have Eclipse Kepler M2Eclipse plugin Java 1.7 Tomcat 7 Step 1 - Maven Project Create a new maven project from your

Why Singleton design pattern is still a good interview question to Java developers

2014-01-20T16:48:00.001-08:00

Why every interviewer asks about singleton design pattern? Well the answer could be either, That's what the interviewer knows to ask for. Or its a good way to start and branch into several other discussions. Or its one of the simplest design pattern and a controversial one in terms of usage. What ever the reason may be, we better know it. What is Singleton Singleton is categorized under "

Spring MVC 3 + Spring Security + Hibernate 4 tutorial

2013-12-20T11:38:00.002-08:00

This tutorial helps you to create a spring mvc application integrated with hibernate 4 and Spring security. Before continuing read through my previous article on Spring MVC 3 - Hello world example The tutorial uses MySQL as database and source code enhanced from the previous Hello world example. Changes to your pom Add/modify the following to the properties section of your pom.xml. The

Spring MVC 3 - hello world example - Quick start

2013-11-15T16:17:00.007-08:00

This tutorial helps you to quickly create and run a spring-mvc hello world application. Spring version used for this example is 3.2.3-RELEASE. Prerequisites JDK 1.6+ Eclipse Juno+ Spring IDE 3.4+ for eclipse Maven 3 Maven Integration plugin for eclipse Tomcat 7+ Initial Steps Right click and create New --> Spring project. In the next dialog, fill in the project name as "

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed - Axis2

2013-11-15T13:20:00.000-08:00

I was recently working on writing some client code which makes multiple webservices calls. The stubs for both my client were generated using Axis2. I had to make requests to 2 different services, where one of the service was serving a dummy SSL certificate and the other one was serving a valid SSL certificate. I landed up getting the following exception,

How to make Eclipse autocomplete to suggest as you type

2013-10-10T12:39:00.001-07:00

Recently some one was asking if Eclipse content assist/autocomplete can be made to suggest as I type my class name? Immediately I could remember XCode for mac doing something like that and I felt there should be a way in Eclipse. By default eclipse autosuggest would trigger once you type "." the goal is to make it suggest me the "Type/Class" names too. How to make it do? Steps: Go to Eclipse(

How to open multiple eclipse instances on Mac

2013-08-01T21:16:00.000-07:00

Multiple instances of eclipse in mac can not be opened by default. While windows users have the privilege to run several eclipses at the same time. I was wondering if there is a way to the same in Mac. Though there are other solutions like editing the eclipse.app etc, the best solution is to use "OSX Eclipse Launcher utility plugin". Follow these simple instructions Go to help --> Eclipse

How to right click on a mac mouse

2013-07-29T15:27:00.003-07:00

Initially I was puzzled on how do I right click on my new mac mouse. :-) If you have searched for this article, you also would have had the same question. Navigate to System Preferences --> Mouse --> "Check" Seconday click --> Click on right side. Once you are done with that you can right click on the mac mouse.

How to convert XML to Java object and vice versa in runtime?

2013-07-25T17:05:00.000-07:00

Well the obvious choice would be to use JaxB, due to its familiarity. Let us see it with a simple example. JAXB is governed by the same team as Glassfish. JAXB comes by default with JDK1.6+. JAXB stands for Java Architecture for XML Binding. XML has become a common form of data storage in many applications and for webservices. There are two common operations that are required while dealing

XML reader error: javax.xml.stream.XMLStreamException: ParseError at [row,col]

2013-07-19T12:55:00.001-07:00

100/100 times I know that this exception happens while there is a parse error in your xml and there is something wrong at the specified row and column. Knowing the following exception is due to an XML parse error, recently I was puzzled for a while trying to look into the actual content of the file. I couldn't see any closing tag error at the row and column mentioned. After looking

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

2013-06-17T15:38:00.000-07:00

I got this exception while I was trying to execute an open source application that I found from the web. I was trying to run the application from my eclipse managed tomcat 7 server. I noticed that my project's maven dependencies were not having the right jars. This problem can be fixed by adding maven dependencies in the project's web deployment assembly. Open the project's properties (e.g.,

Wikipedia, RHEL ditches MySQL and moves to MariaDB

2013-06-14T12:26:00.002-07:00

Prior to this Wikipedia has moved to MariaDB from MySQL recently. According to news from the Red Hat summit which concludes in Boston on Friday, RHEL 7 will also include MongoDB. The switch was expected to happen after Red Hat's community distribution Fedora announced earlier this year that it would be moving to MariaDB. But it will come as a major jolt to Oracle, the owner of MySQL. (openSUSE

Type mismatch: cannot convert from null to double

2013-06-13T12:37:00.001-07:00

Today while I was doing a code review with my team mates, I noticed some code like this When I asked them why do you type cast "null to double", the answer they gave was I got "Type mismatch: cannot convert from null to double". There are 2 possible solutions for this, Use Double instead of double, then you may use null. Use "not a number

How to remove a plugin from eclipse

2013-06-13T12:09:00.000-07:00

Go to Help > About Eclipse > Installation Details, select the software you no longer want and click Uninstall. (On Mac it is Eclipse > About Eclipse > Installation Details.) In older versions, you might need to Run Help > Software Updates > Manage Configuration..., select the feature of interest, and disable it with the task shown in the right window. When a feature is

How to use VIM editor

2013-06-06T12:58:00.002-07:00

VIM Editor Commands Vim is an editor to create or edit a text file. There are two modes in vim. One is the command mode and another is the insert mode. In the command mode, user can move around the file, delete text, etc. In the insert mode, user can insert text. Changing mode from one to another From command mode to insert mode type a/A/i/I/o/O (see details below) From insert mode to command

How to exit from an unix manual page

2013-06-05T17:27:00.001-07:00

Though the answer is simple, I have struggled a bit to get out of the man page. Thought this could help for unix beginners like me. "man" command is very useful to read the manual of any commands that you use from terminal on a linux/mac machines. From your terminal "man command-name" takes you to the manual page. In order to navigate in the pan page use "up" or "down" arrow keys for

How to create a new git local branch and push to repository (remote/origin)

2013-06-05T16:17:00.002-07:00

From your terminal using commands Check your git version with the following command, git --version if you have git version equal or greater than 1.7.0, you should be able to do with the following commands. git checkout -b newbranch git push -u origin newbranch The first command creates a new branch from your current local branch. In order find what's your current branch use the command "

Why should you have your code "neat"

2013-05-30T12:31:00.003-07:00

It is a painful truth that most of my fellow developers don't care about code readability and maintainability. Sometimes its frustrating to make changes on an unformatted, in other words poorly written code. Code that we write represents our brain and I consider my code as how an artist considers his painting. After reading an article on Style matters, I thought of writing this

Collection of very interesting unix commands

2013-05-22T11:39:00.002-07:00

How to get your top 100 unix commands history | sed "s/^[0-9 ]*//" | sed "s/ *| */\n/g" | awk '{print $1}' | sort | uniq -c | sort -rn | head -n 100 > commands.txt How to copy a file to all subfolders of a directory using unix command find . -type d -exec cp pathtofile {}/ \; How to delete all .svn folders from current directory using unix command find . -type d -name '.svn' -print -exec

Few must know unix commands

2013-05-20T15:23:00.001-07:00

After spending more than 9 years of my life in microsoft os, I feel great now to use my Mac notebook. Especially I have fallen in love with the terminal and thrilled to learn the power of unix. I curse myself for not being an unix user so far. Well, its never late to start. :-) As a beginner I thought of sharing my learnings to my fellow unix beginners with few basic commands

Git for beginners

2013-05-16T14:52:00.000-07:00

Getting started with Git I would advise to read through what is Git, and have a decent understanding of SCM process. The first question everyone would get is why I should move away from my current SCM systems(CVS or SVN). Well there are lot of articles around this topic if you google, just a couple of quick reasons I would give to go with Git, Works the best if you

What is maven batch mode

2013-05-07T14:20:00.001-07:00

Maven batch mode Batch mode is to run Maven in a non-interactive, continuous integration environment. When running in non-interactive mode, Maven will never stop to accept input from the user. Instead, it will use default values when it requires input. How to run maven in batch mode Pass one of the params below to mvn command from your terminal, --batch-mode, B

How to rename a file or folder in mac

2013-05-06T12:36:00.001-07:00

Rename a file or folder in mac If you were a windows user and new to mac, you would wonder how to rename a file in mac. The first thing you would try to do is a function f2, which wouldn't have helped. The next effort you would have taken would be to do a cntrl click to look through the options. That wouldn't have helped either. May be you would have then tried "

Struts 1 reaches End of life

2013-05-03T12:15:00.000-07:00

EOL for Struts 1 It has been a great framework since the first release in 2000. I have used it in many of my projects, but its available no more for enhancements. :-) As per Apache there will not be any security fixes as well in the future. Apache's Announcement has the complete details if you are interested to know further.