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Send A Relevant Dilbert Strip To Your Boss

The Dilbert comics is just 2 years younger than me, which means there are thousands of strips. Most of them represent a mocked real-world situation, especially about big corporations and geeks. I have always wondered if managers read Dilbert. I bet they don’t, otherwise they’d say “oh, wait, this thing I’m doing was mocked by Scot Adams, and it is ...

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WADL in Java: Gentle introduction

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WADL (Web Application Description Language) is to REST what WSDL is to SOAP. The mere existence of this language causes a lot of controversy (see: Do we need WADL? and To WADL or not to WADL). I can think of few legitimate use cases for using WADL, but if you are here already, you are probably not seeking for yet ...

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Hadoop Modes Explained – Standalone, Pseudo Distributed, Distributed

After Understanding What is Hadoop Lets start Hadoop on Single Machine: This post contains instructions for Hadoop installation on ubuntu. This is a quick step by step tutorial of Hadoop installation. Here you will get all the commands and their description required to install Hadoop in Standalone mode (single node cluster),  Hadoop in Pseudo distributed mode (single node cluster) and  Hadoop in distributed ...

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MongoDB with Spring Data project

All of us are observing the explosion of NoSql solutions these days. I get used to RDBMS but those are not a solution for all kind of challenges you might have. In my recent experience I got a chance to work with MongoDB – document database. In this post I intent to cover some basics (and some advanced features in ...

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Sharding system architecture: Several things you may need know

[Introduction] Some of you may wondering what’s sharding? If you don’t know the concept, please read the link http://en.wikipedia.org/wiki/Shard_(database_architecture). It’s very useful when you want to deal large data set throughput and traditional single data cluster group (Master-Slave, Master-Master and Slave-Slave, etc) setting couldn’t survive from that kinds of situaion. It’s concept is very simple and you may know in ...

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Configuring MyBatis 3

MyBatis is a very popular and also most efficient SQL mapping framework. MyBatis is available for both in java as well as .net language. MyBatis is not really an alternative of Hibernate but we can use this framework to reduce our database related code with efficient and high performance provided by MyBatis. This tutorial will show you the steps to ...

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Java 7: How to write really fast Java code

When I first wrote this blog my intention was to introduce you to a class ThreadLocalRandom which is new in Java 7 to generate random numbers. I have analyzed the performance of ThreadLocalRandom in a series of micro-benchmarks to find out how it performs in a single threaded environment. The results were relatively surprising: although the code is very similar, ...

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The Wizard Design Pattern

We all love wizards…. (Software wizards I mean). We are always happy to jump on those ”Next” buttons like we were dancing the funky chicken on our… well you get the point. So today we bring you your beloved wizard into your coding experience. Let’s jump right into an example. Say you want to design a ConservativePerson class. import java.util.List; ...

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