git-code-format-maven-plugin: Cannot lock .git/index

I’m interesting in trying out this project, but having some trouble getting started.

If I have a multi-module project, do I need to install anything in the sub-projects?
Do I need to run mvn initialize or is that a stage that happens automatically when I run mvn compile or mvn test?
I’m not noticing anything happening. Are there any common errors I might be making?

Thanks!

About this issue

Starting with 1.36, the plugin is now git commit -a compliant 🎉

I was having this issue as well when adding files and commiting in one command:

git commit -a -m "commit message"

It works when I break it into separate commands to add and commit:

git add -A
git commit -m "commit message"