There are two interesting items here:
In this specific case, the main BU page is published from the git master
branch which tracks version 2.x of the code. This branch is also used to
generate the site which documents both 2.x and 1.x.
1.x just was released again, so the simplest way to document
The Beanutils Download Page has a broken link to version 2.0.0-M2, which
has NOT been released yet (last release was 2.0.0-M1).
https://commons.apache.org/proper/commons-beanutils/download_beanutils.cgi
Also dependency page is showing M2 SNAPSHOT as the version
https://commons.apache.org/pro