We request that Grouper developers adhere to the standards below and also review the page on the Development Environment:

Source control

Git Tips

Github SSH keys

After August 2021, Github will stop allowing password logins for commits. By then, developers will need to generate an SSH key to authenticate for commits. To generate the key, follow this page. You will be generating a key called id_ed25519 and id_ed25519.pub. Then, change the repository URL in the project's git config (this is less well documented). On the project's homepage, click on the Code button to bring up the clone urls. Change from HTTPS to SSH and copy the URL (i.e., git@github.com:Internet2/grouper.git). Then edit your local .git/config file and change the project URL to it. After that, you will be asked for the ssh passphrase for commits instead of username and password.


Developers must create a separate (local) branch for a specific feature if a commit is not for an immediate patch.  That dev local branch should be named something like: GRP-1966-ui-visualization,  During development, multiple interim commits can be made.  Several options to merged back:

  1. In main branch, merge from feature branch (what chris generally does with Eclipse)
  2. In main branch, cherry pick commits from feature branch
  3. (Chad advice) Squash into a single commit for the main branch. Before merging to the main branch, switch back to the main branch, do a git pull to get the latest commits made by others. Then, switch back to the feature branch and do a rebase from the main branch. This makes your code apply to the main branch HEAD, rather than the historical commit where your branch started. The rebase changes the start of your branch to the main branch HEAD, and then replays all of your feature commits on top of it. If there are any merge conflicts, you will discover them now instead of later when trying to merge your feature. You can also test this updated code, to ensure it works before committing it to the main branch.
# Get the latest main branch code before starting the feature
(master) $ git pull
(master) $ git checkout -b grp-1279
(grp-1279) #do work, make commits
(grp-1279) #squash multiple commits together to a single new commit; e.g. here merge
(grp-1279) #the last two commits by changing all but the first commit
(grp-1279) #from "pick" to either "squash" (retain message) or "fixup" (ignore message)
(grp-1279) $ git rebase -i HEAD~~
(grp-1279) $ git checkout master
(master) #get any new commits
(master) $ git pull
(master) #if any new commits, go back to the feature branch and rebase
(master) $ git checkout grp-1279
(grp-1279) $ git rebase master
(grp-1279) #Retest. Fix any conflicts that occurred during the rebase. Then continue below
(grp-1279) $ git checkout master
(master) #merge should be a clean fast-forward merge
(master) $ git merge grp-1279
(master) $ git push
(master) #the branch is merged, can delete it now
(master) $ git branch -d grp-1279


IDE settings





Cross database

Load test with data

groovy:000> edu.internet2.middleware.grouper.helper.LoadData.main()
Wed Dec 22 13:08:05 EST 2021, stem: duke:siss:courses:SUBJECT1:100:10, stems: 6, Groups: 0, Memberships: 28
Wed Dec 22 13:08:06 EST 2021, stem: duke:siss:courses:SUBJECT1:100:11, stems: 7, Groups: 0, Memberships: 56
Wed Dec 22 13:08:06 EST 2021, stem: duke:siss:courses:SUBJECT1:100:12, stems: 8, Groups: 0, Memberships: 84
Wed Dec 22 13:08:07 EST 2021, stem: duke:siss:courses:SUBJECT1:100:13, stems: 9, Groups: 0, Memberships: 112

See also