Extensions

Supports Design By Contract in Java. Discovers "contracts" during class loading and instruments the class bytecodes on-the-fly to check run-time contract violations. [Apache Open Source Licence]

Modification of the Java language designed to have true support for the IEEE 754 floating point standard.

Ant and Maven are common in build processing, but XML is sometimes a less expressive configuration format; Groovy builder utility makes it easy to mix Groovy, Ant and Maven for more expressive, controlled builds. By Andrew Glover. IBM developerWorks.