I occasionally want to close an experimental PR without losing the context and changes associated with it. Is there a better way than dumping a patch into comments as seen below? I don't want lingering topic branches. github.com/jruby/jruby/...

Allow binding instance/internal vars to fields by headius · Pull Request #8804 · jruby/jruby

This is an extension of the existing mechanism for reification of Ruby classes, allowing us to use normal Java fields for either instance or internal variables. The logic here is largely unchanged ...

github.com

JRuby 10.1.1.0 is released, with a bunch of compat fixes, more performance work, and several third-party CVEs resolved. JRuby 10.1 is our active development branch, with 10.0 being stable. Upgrading is recommended if you want the latest and greatest! www.jruby.org/2026/07/22/j...

Is there any standard in place for marking content with its level of AI contribution? Basically, a *standard* way to mark your content as fully human generated all the way up to fully AI generated. Doesn't seem like there's a good standard.

I'm about ready to give up on GitHub Milestones altogether. * No linkage with releases or tags whatsoever * No way to mark multiple milestones * Crappy management UI What am I missing?

I think its time for dependabot-like automated dependency updates to get moved into a separate tab on GH. A few projects I audit for changes are now 90%+ dependabot noise, which adds no value when looking for substantive pull requests. Perhaps a default label for such PRs, with one-click filtering?

Loving #rubyconf this year and seeing so many friends! I'm holding office hours today by the pool at Red Rock Resort, if you're at the event or in the area. We're in cabana number 4 in the roped-off area to the left (see picture). Come say hi and get a JRuby t-shirt or sticker!

Oh boy... After a very long time, we have a new batch of JRuby t-shirts! Limited run so only folks at the JRuby talk, hack space, or cabana can get them! Also plenty of stickers for everyone! blog.headius.com/2026/07/jrub...

> My goal with JRuby has always been to give Rubyists more tools and more opportunities. By combining JRuby with the power and ecosystem of the JVM, we’ve brought Ruby and Rails to places it never could have gone before. Hold my beer. :-)

Charles Oliver Nutter@headius.bsky.social · 4w ago

JRuby returns to RubyConf for the 2026 edition in Las Vegas! I will deliver a talk on Tuesday, run a Hack Space on Wednesday, and would love to hang out with you at JRubyKaraoke (Tuesday night) and the poolside JRuby Cabana (Thursday). Here's all the info: blog.headius.com/2026/07/jrub...

JRuby returns to RubyConf for the 2026 edition in Las Vegas! I will deliver a talk on Tuesday, run a Hack Space on Wednesday, and would love to hang out with you at JRubyKaraoke (Tuesday night) and the poolside JRuby Cabana (Thursday). Here's all the info: blog.headius.com/2026/07/jrub...

JRuby at RubyConf 2026

This year marks a big milestone in my history working on JRuby: twenty years ago, I joined Sun Microsystems to work on the project full-time. This month also marks another milestone for JRuby: two…

blog.headius.com

The more I see pull requests from LLMs and experiment with it myself the more convinced I am that it produces just about the worst code I've ever seen. Not just bad on style, but inefficient, often incorrect, and usually the wrong approach. It "works" in the loosest sense of the word.

I keep hearing how AI will make software so easy to write and yet Gmail still hasn't evolved beyond the mid 2010s.

I'm planning to add direct support for WASM libraries to JRuby so that you don't have to do any of the plumbing to boot up Chicory and bind the exposed functions. Imagine something like JRuby's Java integration, but you just `require 'mylib.wasm'` and call it from Ruby!

Charles Oliver Nutter@headius.bsky.social · last mo.

Here's a use of AI I can get behind: JRuby support for native Ruby libraries using Chicory WASM for JVM and JRuby's JVM integration! RBS (static types for Ruby) uses a C ext on CRuby, but with this PR it now works on JRuby. JRuby support could really expand with this pattern! buff.ly/SDAtXId

Here's a use of AI I can get behind: JRuby support for native Ruby libraries using Chicory WASM for JVM and JRuby's JVM integration! RBS (static types for Ruby) uses a C ext on CRuby, but with this PR it now works on JRuby. JRuby support could really expand with this pattern! buff.ly/SDAtXId

Build the RBS parser as a WebAssembly module (JRuby support, step 1) by soutaro · Pull Request #2998 · ruby/rbs

Why This is the first step toward running RBS on Ruby implementations that cannot load the MRI C extension — notably JRuby — using WebAssembly instead of an FFI/dylib. The parser under src/ is plai...

github.com

Our friends over at @fastruby.io have posted a nice compatibility matrix for JRuby versions, covering Ruby and Rails compatibility. Check it out to learn how the versions line up or if you haven't already discovered how JRuby can help you run Ruby and Rails better! www.fastruby.io/blog/jruby/r...

JRuby & Rails Compatibility Table - FastRuby.io | Rails Upgrade Service

A complete table showing the compatibility between JRuby and Rails across each version, including the Ruby language level and the Java version that each JRuby line requires.

fastruby.io

concurrent-ruby 1.3.7 is released and fixes 3 security vulnerabilities: github.com/ruby-concurr...

Release v1.3.7 · ruby-concurrency/concurrent-ruby

There are 3 security fixes in this release, so updating is recommended. These security vulnerabilities are not very likely to be hit in practice and have a corresponding Low severity score. What's...

github.com

githubstatus.com has overtaken github.com/<anything> in my local browser as the most frequent site I visit after typing "git..."

GitHub Status

Welcome to GitHub's home for real-time and historical data on system performance.

githubstatus.com

Today's AI test: see if Copilot can fix a networking test that sometimes times out. Ran for 5 minutes, changed two InetSocketAddress constructors to use getLoopbackAddress even though the old forms called anyLocalAddress. Fail. The actual fix was to increase the timeout due to slow GHA runners.

Exciting demonstration of how fast JRuby can really be when you sweep away some of the metaprogramming layers of a typical Rails application... even when it already handles Rails HTML requests 2x faster than CRuby! Looking forward to seeing more about Roundhouse.

Sam Ruby@intertwingly.net · 2mo ago

The Ruby JRuby Was Built to Run: intertwingly.net/blog/2026/06...

And it's live! I'll show you the latest and greatest use cases for using JRuby with *real world* examples at RubyConf 2026 in Las Vegas, July 14 at 3:30PM! Tell your friends! rubyconf.org/schedule/

Charles Oliver Nutter@headius.bsky.social · 2mo ago

Good news! I have been added to the RubyConf 2026 schedule to present JRuby and all the ways it lets you use Ruby when CRuby doesn't fit! I'm glad that the new @rubycentral.org values community and understands the importance of JRuby. Twenty years of JRuby...don't miss this talk!

Good news! I have been added to the RubyConf 2026 schedule to present JRuby and all the ways it lets you use Ruby when CRuby doesn't fit! I'm glad that the new @rubycentral.org values community and understands the importance of JRuby. Twenty years of JRuby...don't miss this talk!

JRuby 9.4.15.0 is released! This is the last regularly-scheduled release of JRuby 9.4.x and includes the last set of unreleased 9.4 fixes. Future releases will be done as needed for commercial JRuby users. Contact us if you need long-term JRuby 9.4 support. www.jruby.org/2026/06/08/j...

"I didn't do this thing because it was easy... I did it because I thought it would be easy." - Radan Skorić at RubyConf Austria 😂

In about an hour I'll do my first solo JRuby workshop at RubyConf Austria! I've used this opportunity to start assembling a complete JRuby tutorial, and I'd love to include your ideas. Check it out:

GitHub - headius/tutorial: Sources and walkthroughs for the JRuby workshop at RubyConf Austria 2026

Sources and walkthroughs for the JRuby workshop at RubyConf Austria 2026 - headius/tutorial

buff.ly

I've started a project to collaboratively build templates for JRuby on Rails! So far there's just the bare minimum Rails 8.0 template I posted about earlier this week. Rails template experts are desperately needed, as well as anyone who has an idea for JRuby on Rails templates! buff.ly/XJEOrWg

A wild idea appears... what if you could use JBang with JRuby as a complete Rails command line... no JVM or JRuby installation required? jbang rails@jruby new blog cd blog jbang rails@jruby generate scaffold ... It just needs some tweaks to work. Interested?

Exciting news! We have published 80.0.pre1 gems for JRuby's activerecord-jdbc-adapter for Rails 8.x, as well as a template you can use (thanks to Karol Bucek) to `rails new` a fresh app! buff.ly/V6AeM5H JRuby on Rails is BACK and we're excited to see what you do with it!

Example rails new session with JRuby template for JDBC adapters

Example rails new session with JRuby template for JDBC adapters - gist:0e8addffdd42c1157b4ca81508c8adce

gist.github.com

We're getting ready to finally release Rails 8.0 and 8.1 adapters for ActiveRecord on JRuby! I've set up the CI build to start producing prerelease gems for anyone that wants to give it a try. Hoping to have an official release in the next week or so. (Scroll to bottom): github.com/jruby/active...

Build gems on each push · jruby/activerecord-jdbc-adapter@a98c556

JRuby's ActiveRecord adapter using JDBC. Contribute to jruby/activerecord-jdbc-adapter development by creating an account on GitHub.

github.com

Call me paranoid, but I'm starting to see signs that there's folks actively sabotaging my work on JRuby... advising conferences not to accept my talks and projects to drop JRuby support. It's really disheartening to me after dedicating so many years to the Ruby and JRuby communities. 😢

As part of fully automating JRuby releases, I'm trying to get the Install4J Windows installer to build and verify at a command line. Is there still value in a Windows installer without a Java runtime included? Installing JRuby is basically just "install Java; unzip JRuby; add to PATH".

Finally getting around to automating a bunch of manual JRuby pre-release verification tasks so they always run in CI. At this point, each commit will build a full release, unpack src and test build it, unpack bin and CRUD a simple rails app. More to come.