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grails-logo

Converting Grails Applications to Plugins and vice versa

I was in London last week on vacation with my family and was lucky that there was a London GGUG meetup during my visit. David Dawson discussed modularizing Grails applications by refactoring ...
groovy-logo

Groovy Sql and Oracle ‘Invalid column index’ SQLException

There are some minor potential dangers associated with Groovy’s def keyword. The Groovy style and language feature guidelines for Java developers provides some warnings about ...
groovy-logo

Escaping XML with Groovy 2.1

When posting source code to my blog, I often need to convert less than signs (<), and greater than signs (>) to their respective entity references so that they are not confused ...
akka-logo

Managing congested actors in Akka

There comes a time in an Akka application when an actor can longer handle increasing load. Since each actor can only handle one message at a time and it keeps a backlog of pending messages ...
groovy-logo

Enhanced Groovy-based JAR/Manifest Diff Tool

This brief blog post provides another Groovy script that provides simple differencing of two JAR (or WAR or EAR) files and their MANIFEST.MF files. It represents a combination of the ...
scala-logo

Fake system clock pattern in Scala with implicit parameters

Fake system clock is a design pattern addressing testability issues of programs heavily relying on system time. If business logic flow depends on current system time, testing various ...
groovy-logo

Comparing Manifest Files with Groovy

My last post discussed comparing the high-level contents of two JAR files using a Groovy script and a 2011 post covered displaying a particular JAR file’s manifest file. This ...
grails-logo

Grails – RESTful Webservice using JAX-RS plugin

I discussed about RESTful architecture consideration and how to build RESTful web services using Jersey JAX-RS [JSR 311]  in JAVA. Today I am going to discuss how to build the RESTful ...
groovy-logo

Comparing JARs with Groovy

It can sometimes be useful to compare the contents of two JARs. In this blog post, I demonstrate a Groovy script that acts like a simple “diff” tool for comparing two JAR ...
clojure-logo

Macro lifecycle in Clojure

If you still struggle to understand what are macros in Clojure and why are they so useful, I will guide you through another example today. We will learn when macros are recognized, ...
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