JRuby 9.4.12.0 Released

Tuesday, February 11 2025

The JRuby community is pleased to announce the release of JRuby 9.4.12.0.

JRuby 9.4.12.x targets Ruby 3.1 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward!

Critical Fixes

  • Added additional locking to the new Class#subclasses implementation to fix a concurrent modification error. #8602, #8603

Standard Library

  • jar-dependencies upgraded to 0.5.4 to fix an issue parsing Maven output on Java versions 9 and higher. #8606, #8615

4 Issues and PRs resolved for 9.4.12.0