Grouper API javadoc and cross-referenced source code is at http://software.internet2.edu/grouper/doc/ . The master branch is updated twice per month by a cron job on i2midev6 (service user grprdist) , and pulled via rsync to webprod3. The site including javadoc can also be built locally from the script in Git grouper/misc/buildJavadocAll.sh. Or, the simple Maven command mvn -f grouper-parent --clean site site-deploy will be enough to generate the site. The site directive will build the site locally in a subdirectory of grouper-parent, and site-deploy will stage it in directory /tmp/groupersite.
Between 2014 and 2019, the git branch gh-pages was updated with the javadoc on every commit, which effectively published it on http://internet2.github.io/grouper/ . That method has been decommissioned due to the size explosion in the git repository. The main page of the github.io site now redirects to the software.internet2.edu site.