Charles Oliver Nutter
@headius
JRuby guy, Java, Ruby, OSS business liaison. Find me: @[email protected] or @headius.bsky.social Sponsor me: https://github.com/sponsors/headius
🔥 @headius announced the last big hurdle for RBS in JRuby has been cleared. Static typing for JRuby is almost here! github.com/ruby/rbs/pull/…
"Industry-scale code optimization — think re-tuning GPU kernels or the relentless, multi-layered refinements behind Chrome’s V8 engine — remains stubbornly hard to evaluate." AI code slop still needs kernels and runtimes. news.mit.edu/2025/can-ai-re…
I found my program guide and handwritten notes from my first JavaOne. Those were exciting times.
Now this is a Lego build I can get behind! beta.ideas.lego.com/product-ideas/…
Sooo... can I use this to get a free copy of Windows 11?
I just realized who to blame for excessive AI hype: it's the AIs themselves. Anyone playing with these tools to generate text or code is also fed a stream of sugary-sweet affirmations declaring a perfect job. Those who dig deeper realize that this optimism is hallucinated.
A few friends asked recently what we use to help our kids manage money. Greenlight basically lets us be the bank, with features for chores and allowances, investing and parent-paid interest, and budgets for gas and groceries. Happy with it so far! share.greenlight.com/91792635
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! jruby.org/2025/07/17/jru…
An excellent example of why Ruby on the JVM has so much potential: a json stdlib contributor recently added vectorization to the C code, so I suggested doing the same for JRuby using the JDK Vector API! The result is simpler than C, and works everwhere! buff.ly/XlPviDW
Don’t let the LLM think. LLMs are bad thinkers, and are choosing between options probabilistically. If you let the LLM think you create a negative feedback loop, because the decision will be slop. Slop in context begets worse slop. LLMs autocomplete, they don’t think.
Today's the day! Beat the heat and join me and the Ruby Users of Minnesota at Lab651 for my talk "JRuby in 2025: Faster, Strong, Better"! Beer at the meeting is sponsored by @headiusents and we can hang out after at Lake Monster brewing. See you there! buff.ly/0pasj0Z
It's 2025 and GitHub still doesn't let you associate an issue with multiple milestones. github.com/orgs/community…
Fixing obscure Ruby bugs sometimes feels like using an AI: I write a bunch of code that looks like it should work and passes a test, but I don't understand it, can't explain it, and I've almost certainly broken something else.
Join me and the Ruby Users of Minnesota on Tuesday evening for a JRuby extravaganza! I'll give an update on development progress and optimization work and show off a bunch of fun and powerful use cases. See you there July 15th at 6:30pm! meetup.com/ruby-mn/events…
I'm starting to suspect companies are shoving AI in our faces not just to justify their enormous investments. They're also trying to make us dumber and more addicted to AI help, so we'll pay for it in the future. I don't want your AI to write my email. Stop fucking asking.
Anyone got some Windows-based cloud resources they could donate to JRuby? I have a need to do some bug fixes and testing on x86 Windows but I only have my ARM MacBook. Donations of newer/better hardware or software licenses would also be greatly appreciated!
It's time for the last #RailsConf! Sadly, since my #JRuby talk was rejected, I won't be able to participate, so I need you to step up and represent. Let me know if you're there and I'll try to connect you with other JRubyists! Tell people our story and spread the word!