JRuby Dev Team

Operated by @headius, @tom_enebo, @hiro_asari

[JRuby Dev Team @jruby]

JRuby 10.1 is released! We've caught up with CRuby 4.0 after less than four months, and pushed a bunch of new optimizations: smaller objects, smaller numerics, and groundwork for many more. We'll maintain 10.0 as our stable line, but do try 10.1 yourself!
https://t.co/m5xI9AMgq2

[JRuby Dev Team @jruby]

JRuby 10.0.5.0 is released! This round we fixed some memory leaks when embedding multiple JRuby instances, a few pesky Windows bugs, and several Ruby compatibility blockers. Enjoy!
https://t.co/5ARuxLXADb

[JRuby Dev Team @jruby]

Today we were informed of a low-severity vulnerability in the bcrypt-ruby gem. We worked with the maintainers to arrange a fix. Upgrading is recommended.

CVE-2026-33306: Integer Overflow Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby

https://t.co/Ob6JAGYQ3k

[JRuby Dev Team @jruby]

JRuby 10.0.4.0 is released! A month after 10.0.3.0, we've addressed lots of one-off issues, a few memory and thread-safety fixes, and general compatibility and stabilization work. Enjoy!
https://t.co/GIJiiR8WZk

[JRuby Dev Team @jruby]

JRuby 10.0.3.0 is released! Over 80 issues and pull requests and 13 external contributors combined to help further stabilize our 10.0 series! There's lots of compatibility fixes, a few performance enhancements, and a number of library updates.

https://t.co/teZlO0KahQ

[Charles Oliver Nutter @headius]

New post: Warbled Sidekiq: Zero-install Executable for JVM

Previously, I showed how to use Warbler to package a simple tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background job server!

https://t.co/6Bv0Ndly1F

[Charles Oliver Nutter @headius]

New post: "Packaging Ruby Apps with Warbler: Executable JAR Files"

Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. Let’s use Warbler to create all-in-one packaged Ruby apps!

https://t.co/uNyZ7Iu6Lh

[JRuby Dev Team @jruby]

Warbler 2.1.0 has been released! Warbler allows you to package JRuby applications (with obfuscation of code) as a single binary, either a .jar file you can run directly or a .war file you can deploy to any Java application server. Blog post coming!

https://t.co/ZpUtxYKrFp

[JRuby Dev Team @jruby]

We have published Docker images for JRuby 9.4 and JRuby 10 on JDK 25! The -dev images are also updated to latest commits. Give them a try and let us know if there's any issues!

[Charles Oliver Nutter @headius]

At the end of my post on JRuby and JDK 25 startup time features, I teased a bit of the unreleased improvements from Project Leyden. It turns out the latest commits improve startup time even more, so it seems worth posting a quick follow-up!

https://t.co/OJavH9BpXQ

[Charles Oliver Nutter @headius]

New post: JRuby and JDK 25: Startup Time with AOTCache

Let's take a look at JRuby's startup time journey, all the way up to using JDK 25's AOTCache and Project Leyden features coming to a JDK near you soon.

https://t.co/aw4G6MKoo5

[JRuby Dev Team @jruby]

JRuby 9.4.14.0 is released! We've updated a bunch of the standard library (including "cgi" to fix a couple of CVEs), fixed a few memory leaks and a bunch of compatibility issues, and generally stabilized things. Upgrading is recommended!

https://t.co/X4FoGd4q33

[JRuby Dev Team @jruby]

JRuby 10.0.2.0 is released! This is a small release to fix an ArgumentError regression in JRuby 10.0.1.0 plus a few other small fixes. Recommended upgrade for all, but let us know if you run into any issues!
https://t.co/GK7bH1dQbu

[JRuby Dev Team @jruby]

We have just released JRuby 10.0.1.0, our first update to JRuby 10! There's dozens of patches including full support (finally) for Zeitwerk and a bunch of Ruby 3.4 language fixes. Upgrade today and let us know how it goes!

https://t.co/vgbTTow6if

[JRuby Dev Team @jruby]

We have released jruby-maven-plugins 3.0.6, updating JRuby to 9.4.13.0 along with several other improvements. But more exciting: Warbler is BACK! We've updated it for latest JRuby and dependencies and it's running green in CI. Time for feature requests!

https://t.co/rorRiMe4Rd

[JRuby Dev Team @jruby]

FYI: now that Ubuntu 20.04 is EOL, future releases of the JRuby Docker image will be based on Ubuntu 22.04.

This will take effect with releases 9.4.14.0 and 10.0.1.0, whenever they happen.

See https://t.co/X72AuXUwjY

[JRuby Dev Team @jruby]

JRuby 9.4.13.0 is released! We have fixed several user issues, including a slow leak in Java interface implementation, a possible deadlock between JIT and main threads, and backported launcher improvements from JRuby 10!
https://t.co/jfToWcyXwK

[JRuby Dev Team @jruby]

@nanovms @headius Thank you!

[NanoVMs @nanovms]

this week on the unikernel application spotlight we check out @jruby https://t.co/SwF2OZzk93 real threads && jvm interop - congrats on 10.x release and 24 yrs! @headius

[Charles Oliver Nutter @headius]

That's right... JRuby is the only Ruby with a fully-portable, all-in-one distribution that works with Bazel's secure, closed-world builds. You want secure, stable, scalable Ruby, you use JRuby! Thanks for the chat at @rubykaigi!