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Hadoop Hangover: Launch a hadoop cluster CDH4 using Apache Whirr

This post is about how-to launch a CDH4 MRv1 or CDH4 Yarn cluster on EC2 instances. It’s said that you can launch a cluster with the help of Whirr and in a matter of 5 minutes! ...
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Pool of ssh connections using Apache KeyedObjectPool

I found the org.apache.commons.pool extremely useful and robust, but not well documented. So, I’ll try to help a bit here explaining how to use an Apache KeyedObjectPool. What ...
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Hello GroovyFX

GroovyFX brings together two of my favorite things: Groovy and JavaFX. The main GroovyFX Project page describes GroovyFX as ‘[providing] a Groovy binding for JavaFX 2.0.’ ...
java-interview-questions-answers

Introduction To JavaEE Concepts

This post aims at clarifying acronyms and concepts used in the J2EE paradigm. J2EE stands for Java to Platform, Entreprise Edition. It enables the creation of modular Java applications ...
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Bloated JavaBeans – Don’t Add “Getters” to Your API

I have recently blogged about an idea how JavaBeans™ could be extended to reduce the bloat created by this widely-accepted convention in the Java world. That article was reblogged ...
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JDBC Realm and Form Based Authentication with GlassFish 3.1.2.2 and Primefaces 3.4

One of the most popular posts on my blog is the short tutorial about the JDBC Security Realm and form based Authentication on GlassFish with Primefaces. After I received some comments ...
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Java concurrency: the hidden thread deadlocks

Most Java programmers are familiar with the Java thread deadlock concept. It essentially involves 2 threads waiting forever for each other. This condition is often the result of flat ...
spring-interview-questions-answers

Spring Framework: Three Spring Bean Lifecycle Techniques

When using the term ‘lifecycle’ the Guys at Spring are referring to the construction and destruction of your beans and usually this is in relation to the construction and ...
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How aggressive is method inlining in JVM?

Ctrl + Alt + M is used in IntelliJ IDEA to extract method. Ctrl + Alt + M. It’s as simple as selecting a piece of code and hitting this combination. Eclipse also has it. I hate ...
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Jenkins hierarchical jobs and jobs status aggregation

As you probably know, Jenkins is highly configurable CI server. We can setup different custom build process. And I’m going to share some approach I’ve been using to setup ...
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