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Tag Archives: Apache Commons

Java Command-Line Interfaces (Part 1): Apache Commons CLI

Although I typically use Groovy to write JVM-hosted scripts to be run from the command-line, there are times when I need to parse command-line parameters in Java applications and there is a plethora of libraries available for Java developers to use to parse command-line parameters. In this post, I look at one of the best known of these Java command ...

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Apache Commons IO Tutorial: A beginner’s guide

Apache Commons IO is a Java library created and maintained by the Apache Foundation. It provides a multitude of classes that enable developers to do common tasks easily and with much less boiler-plate code, that needs to be written over and over again for every single project.The importance of libraries like that is huge, because they are mature and maintained by ...

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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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Common and Unique Elements In Multiple Collections

This week, we’ll take a break from higher level problems and technology posts to deal with just a little code problem that a lot of us have probably faced. It’s nothing fancy or too hard, but it may save one of you 15 minutes someday, and occasionally it’s nice to get back to basics. So let’s get down to it. ...

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Apache Commons Lang StringUtils

So, thought it’d be good to talk about another Java library that I like. It’s been around for a while and is not perhaps the most exciting library, but it is very very useful. I probably make use of it daily. org.apache.commons.lang.StringUtils StringUtils is part of Apache Commons Lang (http://commons.apache.org/lang/), and as the name suggest it provides some nice utilities ...

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