To use the charts4j API, put this jar (found in the charts4j-[VERSION]/lib directory) in your classpath:
charts4j-[VERSION].jar
To run the unit tests you will also need junit-[VERSION].jar
For Maven, include this XML snippet in your pom.xml.
For Leiningen Clojure, users please use:
[com.googlecode.charts4j/charts4j "[VERSION]"]