We'd love to accept your patches and contributions to this project. There are just a few small guidelines you need to follow.
Contributions to this project must be accompanied by a Contributor License Agreement (CLA). You (or your employer) retain the copyright to your contribution; this simply gives us permission to use and redistribute your contributions as part of the project. Head over to https://cla.developers.google.com/ to see your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.
All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.
Remember that the Google App Engine Standard Java8 and Java11 runtimes are used by hundred of thousands of customers! Our code has been evolving since 2007 (internally at Google) and been pushed every 2 weeks or so, without breaking running deployed applications (the real value of a Platform As A Service product). OK, we broke a few times, and issued a rollback as soon as possible. The code might not be perfect, and could be cleaned up a lot, but the GAE runtime has to continue to serve many applications deployed years ago and still working without changes.
Google App Engine engineers will review the proposed changes, and will decide if ultimately it can be pushed to production. If the change cannot be pushed for whatever reasons, the change will be rollbacked.
This project follows Google's Open Source Community Guidelines.