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FreeChart with Groovy and Apache POI

The point of this article is to show you how to parse data from an Excel spreadsheet that looks like this:and turn it into a series of graphs that look like this:Recently I was ...
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Mahout and Scalding for poker collusion detection

When I’ve been reading a very bright book on Mahout, Mahout In Action (which is a great hands-in intro to machine learning, as well), one of the examples has caught my attention. Authors ...
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Groovy DSL – A Simple Example

Domain Specific Languages (DSLs) have become a valuable part of the Groovy idiom. DSLs are used in native Groovy builders, Grails and GORM, and testing frameworks. To a developer, ...
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Custom Ordering Scala TreeMap

How do you get custom ordering in a Scala TreeMap? Well this puzzled me for a while. The answer lies in the world of implicits and receiver type converters. In a ...
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Grails Custom AuthenticationProvider

In order to tighten up security in our new Grails app I went about implementing the Spring Security Plugin. Getting it up and running with a standard username/password scenario was ...
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GitHub Social Graphs with Groovy and GraphViz

The Goal Using the GitHub API, Groovy and GraphViz to determine, interpret and render a graph of the relationships between GitHub users based on the watchers of their repositories. ...
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Power with control: Scala control structures and abstractions

So ramping up with the Scala 101 series, I thought now is an appropriate juncture to introduce control structures in Scala. To a certain extent, working with the Scala language presents ...
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ScaTDD: Casting an eye over three major Test frameworks in Scala

Testing has traditionally been the gateway process for Scala development at a number of Java shops looking to evolve their tech stack with minimal disruption or committment. ...
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Using Groovy scriptlets inside a *.docx document

Introduction One of my recent projects required automated generation of contracts for customers. Contract is a legal document of about 10 pages length. One contract form can be applied ...
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A crash course in Scala types

After many years of Java development, discovering Scala’s type system and related features was something of a departure for me. Suffice to say GADT wasn’t my first four letter ...
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