This document summarizes and compares several Java build tools: Ant, Ivy, Maven, and Gradle. It provides an overview of each tool, including descriptions, websites, and basic usage. It also includes a comparison chart that rates each tool on criteria like learning difficulty, maintenance, speed, and stability. The conclusion is that while Ant will remain, Maven 2 is transitioning to Maven 3, and Gradle may be the future, none have obvious advantages over the others.