Portable VoidCoder

[ganesh-skumar]

Makes Java VoidCoder portable, to handle void values across SDKs

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for a portable VoidCoder in the Apache Beam pipeline model. By defining a standard URN for the Void type and registering it within the Java SDK's model coder infrastructure, this change ensures that void values can be consistently handled and serialized across different SDKs.

Highlights

• Protocol Buffer Update: Added the VOID coder definition to the StandardCoders enum in the pipeline runner API.
• Java SDK Integration: Registered VoidCoder in ModelCoderRegistrar and ModelCoders to enable its use across SDKs.
• Testing: Updated CoderTranslationTest to include VoidCoder in the known coders validation suite.

New Features

🧠 You can now enable Memory (public preview) to help Gemini Code Assist learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. Click here to enable Memory in your admin console.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize the Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counterproductive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for GitHub and other Google products, sign up here.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request introduces support for a standard VoidCoder in the Apache Beam runner API and Java SDK. It adds the VOID coder definition to the standard coders protobuf, registers VoidCoder in ModelCoderRegistrar and ModelCoders, and includes corresponding test coverage in CoderTranslationTest. There are no review comments, so no additional feedback is provided.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[ganesh-skumar]

R: @robertwb

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.64%. Comparing base (b3a62ee) to head (0989197).
⚠️ Report is 196 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #38937       +/-   ##
=============================================
- Coverage     60.30%   56.64%    -3.66%     
+ Complexity    20572     3638    -16934     
=============================================
  Files          3317     1184     -2133     
  Lines        315123   188015   -127108     
  Branches      17143     3753    -13390     
=============================================
- Hits         190026   106508    -83518     
+ Misses       116549    78040    -38509     
+ Partials       8548     3467     -5081     

Flag	Coverage Δ
java	72.65% <ø> (+5.59%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[ganesh-skumar]

assign set of reviewers

[github-actions]

Assigning reviewers:

R: @kennknowles for label java.

Note: If you would like to opt out of this review, comment assign to next reviewer.

Available commands:

• stop reviewer notifications - opt out of the automated review tooling
• remind me after tests pass - tag the comment author after tests pass
• waiting on author - shift the attention set back to the author (any comment or push by the author will return the attention set to the reviewers)

The PR bot will only process comments in the main thread (not review comments).

[kennknowles]

This all seems good to me - please check on the CI results which are all red.