Swift/Java Interop Community Call #6: April 9th 2026

Development Java interoperability
1

Hi everyone!

This will be our 6th meeting and third one in 2026!

This is a community call intended for anyone interested in joining and collaborating on swift/java interoperability. If you'd like to contribute in any capacity, please don't hesitate to join.

The next meeting I expect we'll want to talk about Gradle integration some more, so please join if you're interested in that!

First Quarter Summary

We're having a really amazing new year with lots of new contributions, thanks a lot to all contributors!

The first quarter was really quite active:

  • 95 commits across 11 full weeks (Jan 5 – Mar 17)
    • 80 came from merged PRs, 15 were direct commits
    • Average: ~7.9 commits/week

And I'd like to shout out @madsodgaard, @Iceman and @Timofey_Solonin for their stream of contributions, thank you!

Key Themes

  1. Generics — Massive updates in making Java generics work correctly in both directions (wrap-java and jextract/jni), largely driven by @Iceman, thanks a lot!
  2. Native collection types — We introduced SwiftDictionaryMap, SwiftSet, Swift tuple support -- those are now fully supported in jextract/jni and don't incur copying onto the JVM heap, unless you want them to
  3. Foundation type bridging — Data, Date, UUID now bridge across JNI. We've also been working hard to avoid linking Foundation by accident, which is a huge win for binary size for our users on Android :robot:
  4. Modularization — swift-java-jni-core split into its own package, allowing some other low-level libraries to reuse some of the core logic. Thank you @marcprux for the support on this front!
  5. Android — We've added some cool features about availability -- we're now able to ingest api-versions.xml and parse java classfiles, resulting in accurate @available(Android ..., *) annotations when importing the Android SDK!

In the coming days we'll also tag a 0.1 of swift-java co you can start relying on it for development rather than depending on the main branch. This isn't API stability yet, but it'll help in adoption in real projects!

Previous meeting

Swift/Java Interop Community Call #5: March 5th 2026

Meeting details

When: 2026-04-09T13:00:00Z (click to see the time in your timezone) [webex]

We found the time to work relatively well and span 4 very different timezones, please cooperate with us as we continue with this timeslot. We may choose different
times in the future.

Where: The meeting will hosted on Webex, make sure to install the app before joining.

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