This document discusses several Java build tools: Apache Ant, Apache Maven, and Gradle. Apache Ant is an older build tool that uses XML build files and Java classes to drive processes. Apache Maven aims to provide a uniform build system with guidelines for best practices. Gradle combines the power of Ant with Maven's dependency management in a Groovy-based DSL. The document encourages choosing the best build tool for the job and provides a high-level overview of features of Ant, Maven, and Gradle.