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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 is a KeyedObjectPool? It’s a map that contains a pool of instances of multiple types. Each type may be accessed using an arbitrary key. In this example I’ll create a pool of ...

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My favourite programming quotes


I find myself thinking about some of these quotes every now and then and I just wanted to share them here. Some of them are kind of funny but mostly I believe they all should make us think for a second about our job and how many times you’ve been in that situation… If you have some pearl of wisdom ...

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How To Secure an Organization That Is Under Constant Attack


There have been many recent security incidents at well-respected organizations like the Federal Reserve, the US Energy Department, the New York Times, and the Wall Street Journal. If these large organizations are incapable of keeping unwanted people off their systems, then who is? The answer unfortunately is: not many. So we must assume our systems are compromised. Compromised is the ...

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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.’ GroovyFX is further described on that page: GroovyFX is an API that makes working with JavaFX in Groovy much simpler and more natural. GroovyFX is focused on exploiting the power of the Groovy Builder ...

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Groovy and HTTP


This article originally appeared in the December 2012 issue of GroovyMag. Some different ways that Groovy makes interacting with the web easier One of the major benefits of Groovy is how it simplifies some of the common scenarios we deal with in Java. Complex code with conditionals, error handling and many other concerns can be expressed in a very concise ...

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Android Game Development with libgdx – Animation, Part 2


This is the second part of the Building a Game with LibGdx series. Make sure you read the first part before starting on the second. There will be a lot of stuff covered in the following articles so I will try to break them down in more digestible sizes. We left off with a basic world and Bob gliding back ...

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A down side of durable messaging


Overview Durable messaging can be very fast, as fast as non-durable messaging up to a point. Limitations of durable messaging Durable messaging is dependant on the size of your main memory and the speed of your hard drive.  If you have a HDD, this can be as low as 20 MB/s and as high as 60 MB/s.  A RAID set ...

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Code and Code Reviews: What’s in a Name?


In a code review a developer needs to look at the code from two different perspectives: Correctness. Is the code logically correct, does it do what it is supposed to do? Will it hold up in the real world? Is it safe? Does it handle errors and exceptions? Does it check for bad input parameters and return values? Is it ...

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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 to be deployed on application servers. It relies on Java SE, a core set of Java libraries upon which all Java applications are implemented. General Concepts Before we dive into J2EE, ...

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