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

Development Java interoperability
1

Hi everyone,

this will be our 5th meeting and second one in 2026. Given FOSDEM travel and me getting sick along the way this has slipped a few weeks, sorry about this – meanwhile folks have been working on the project, so it’ll be good to re-connect again :slight_smile:

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.

Previous meeting

Meeting details

When: 2026-03-05T13:00:00Z (click to see the time in your timezone)

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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Swift/Java Interop Community Call #6: April 9th 2026
2

This is today! Cya soon :slight_smile:

Potential agenda items:

  • the new swift-java-jni-core repository
  • ongoing work by folks, including really cool generic calls support WIP
  • ongoing work to avoid linking Foundation/ICU to lessen size of Android apps

Any topic you might want to talk about!

3

Thank you everyone for joining today!

Here's some quick notes from the call. The next one will be in around a month's time, cya then!

Swift Java Community Call Notes: 5

Actions from last time

New folks joining?

  • Timofey
  • Mads
  • Finagolfin
  • Konrad
  • Georgio
  • Asley (video streaming app for client)
    • SwiftJava provides a great user experience, easier to work with
    • passing between
    • Blutooth explorer - skip briding for UI and the SwiftJava as well

Agenda

Publishing releases

  • :a: Konrad: We'll release a 0.1 so folks can easily depend on it
  • Release of the java libs is still pending

Swift Java JNI Core repo

Passing objects between Skip and SwiftJava

This currently does not work but the new swift-java-core-jni should help towards that. Marc is investigating so there's full compatibility between the libs.

Slimming down libs

  • Mads talking about their efforts about slimming down libs
  • Ecosystem wide push to if canImport(FoundationEssentials)
  • OpenAPIGenerator done quickly, HTTPClient, and Protobuf
    • Sadly had to reimplement some logic in pure Swift
  • List the PRs:
    • TODO
  • Down from 100 Mb to 20Mb
  • Konrad&Mads: put a guide on this on SwiftJava docs
  • :a: Mads to write up docs

Marc:

  • The link everything into one object file was not really good for size after all
    • since it's a lib, maybe we're missing "declare entry points"
    • Marc can share how he got it to work in his case, but the gains were not so spectacular

SwiftPM prototype

  • :a: Konrad: Review, sadly got delayed with getting sick etc
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