Google Guice (my favorite DI framework for Java) has a neat extension called “Multibindings” that allows you to auto-magically inject a collection of objects that implement a particular interface. This allows you to model SPI-style interfaces with ease.

Multimaps are one of the many collections in Google Guava. I describe why you might want to use them.

I walk through the type inferencing engine in the new JVM language: Mirah

A lightning fast walkthrough of using the Sinatra micro-web-framework with JRuby as the platform.

Part Four in my “Distilling JRuby” series talks about the techniques for generating frames and backtraces.