If you see this page online at ant.apache.org, it is not a bug, but on purpose. We do not provide an online version of the API docs, they are included with all our distributions, including the nightly builds.

If you want to see the API docs for the latest code, they are generated by Apache Gump and linked from http://nagoya.apache.org/gump/javadoc/ant/build/javadocs/index.html.