Contributing to Apache Ant

You have found a bug or think you know how to code a great feature that all other people could benefit from? This is great, we'd love to hear from you.

Ant‘s primary code repository is the git repository at Apache and we’ve also got a github mirror.

There are two ways you can contribute, you can either use the “traditional” approach of creating a patch and attaching it to a Bugzilla issue or you use a github pull request. We do not plan to use github issues, so if you are reporting a bug, please raise a Bugzilla issue.

Before reporting a bug, please also review

If you‘re planning to implement a new feature please discuss your changes on the dev list first. This way you can make sure you’re not wasting your time on something that isn‘t considered to be in Ant’s scope.


The master branch is where we develop the next release of Ant 1.10.x - any patch or PR against this branch must be buildable using Java8.

The branch 1.9.x is where we develop the next release of Ant 1.9.x - any patch or PR against this branch must be buildable using Java5.

Please state clearly whether you are targeting 1.9.x or 1.10.x - usually we port changes from 1.9.x to 1.10.x but not necessarily the other way around.

Making Changes

  • Create a topic branch from where you want to base your work (this is usually the master or the 1.9.x branch, see above).
  • Make commits of logical units.
  • Respect the original code style:
    • Only use spaces for indentation.
    • Create minimal diffs - disable on save actions like reformat source code or organize imports. If you feel the source code should be reformatted create a separate issue/PR for this change.
    • Check for unnecessary whitespace with git diff --check before committing.
  • Make sure your commit messages are in the proper format. Your commit message should contain the key of the Bugzilla issue if you created one.
  • Make sure you have added the necessary tests for your changes.
  • Run all the tests with ./ clean test to assure nothing else was accidentally broken.

Submitting Changes

  • Sign the Contributor License Agreement unless your change is really small or you have already signed one.
  • If you want to create a patch for your Bugzilla issue use git format-patch to create it (or a set of patches), this way we can keep your author information. Attach the patch(es) to the issue.
  • Alternatively push your changes to a topic branch in your fork of the repository.
    • Submit a pull request to the repository in the apache organization.