title	conference	date
Expand your Ruby Potential with JRuby	RubyConf 2026	2026-07-14
JRuby runs Ruby on the JVM with concrete wins: 26x faster allocation than CRuby in benchmarks and base object sizes reduced from 32 to 24 bytes (with a 16‑byte… Talk on
Twenty Years of JRuby	RubyKaigi 2026	2026-04-22
Twenty years of work on JRuby produces concrete wins: JRuby 10.1 released with a core object layout reduced to 24-byte objects and short Fixnum storage, a JIT… Talk on
Building JRuby: How We Implement Ruby on the JVM	RubyConf 2024	2024-11-13
JRuby 9.4 is compatible with Ruby 3.1 and JRuby 10 aims to track CRuby while dropping Java 8 for Java 21; the codebase shrank from ~400,000 to ~300,000 LOC of… Talk on
20 Years of JRuby - Where We've Been and Where We're Going	JVM Language Summit 2024	2024-08-05
JRuby claims 20 years of driving JVM features and now hits concrete milestones: ~99% language compatibility, a plan to adopt the Prism parser, and Java ports… Talk on
Ruby on the Modern JVM with JRuby	RubyConf AU 2024	2024-04-11
JRuby claims Ruby parity (9.4 → Ruby 3.1) while gaining JVM benefits: world-class GC, JIT, and the prospect of faster startup on Java 22. Demonstrated work… Talk on
Leading Edge! Changing the Java World	Devnexus 2023	2023-04-04
JRuby maps Ruby to the JVM using concrete JVM features: invokeDynamic -> 2x–4x speedup on benchmarks and combined with Graal JIT yields up to 15.7x; Project… Talk on
Leveraging the Modern JVM: How JVM Languages Benefit from Loom, Panama, and More	Jfokus 2023	2023-02-06
JRuby ports Ruby to the JVM and demonstrates concrete uses of new JVM features: invokeDynamic 3.7× speedups on some benchmarks and up to ~4× versus old JVMs… Talk on
Scaling Ruby with JRuby	RubyConf TH 2022	2022-12-09
JRuby 9.4 runs Ruby 3.1 on the JVM (Java 17) and gives real native parallel threads so a single JRuby process uses many cores with Puma and MySQL rather than… Talk on
Using JRuby: What, When, How, and Why	RubyConf 2022	2022-11-29
JRuby 9.4 brings Ruby 3.1 compatibility and runs on Java 17 with JIT, GC and parallel threads showing real gains: Railsbench and a MySQL blog both run about 2x… Talk on
Scaling Rails with JRuby in 2022	RailsConf 2022	2022-05-17
JRuby 9.4 brings Ruby 3.1 compatibility and shows concrete wins: Rails 7 apps on Puma run a local scaffolded benchmark at about 2,500 → 3,500 req/s using 20… Talk on
JRuby: Zero to Scale! 🔥	RubyConf 2019	2019-11-18
JRuby 9.2.9 claims concrete wins: a recent patch drops memory by 24% on a single-controller Rails app, the oj JSON extension runs about 1.5–3× faster than… Talk on
JRuby on Rails: From Zero to Scale	RailsConf 2019	2019-05-01
JRuby runs Rails on the JVM with no global interpreter lock, JVM tooling and Java libraries for gaps, and migration helpers like JRuby-lint and… Talk on
JRuby 2018: Real World Performance	RubyConf 2018	2018-11-28
JRuby 2018 claims concrete wins: an Oj port (originally ~20,000 lines of C) now as Java at half the code and running about 3x faster on JSON; invokedynamic and… Talk on
Graal Without Truffle	JVM Language Summit 2018	2018-08-04
Argues that Graal’s benefits can be reaped without adopting Truffle by using JVM techniques: invokedynamic, aggressive inlining, partial escape analysis, and… Talk on
JRuby in 2018: Building, Deploying, and Scaling Your Apps	RubyC 2018	2018-06-02
JRuby 9.2 is Ruby 2.5 compatible and focuses on compatibility first while shifting effort to performance; the runtime ships a long-standing JIT to JVM bytecode… Talk on
MethodHandles Everywhere	Jfokus 2018	2018-02-05
MethodHandles are shown as fast, composable function pointers that the JVM can inline: method handle trees combine direct calls, adapters like guardWithTest… Talk on
JRuby: What Why How ... Do it Now!	RubyConf 2017	2017-11-15
JRuby ships as 9.1.14 (Ruby 2.3 compatible) with 9.2 targeting Ruby 2.4 and requires Java 7+, runs native threads, uses invokedynamic and the Graal JIT for… Talk on
JRuby at 15 Years: Meeting the Challenges	RubyKaigi 2017	2017-09-18
JRuby reports concrete progress and measurable targets: branch 9.1 supports Ruby 2.3, master targets 2.4 with Java 8 minimum, and startup work aims to cut gem… Talk on
Let's Talk About Invokedynamic	Joker 2016	2016-10-14
Invokedynamic arrives as a new JVM bytecode plus a fast API of method handles and call sites, letting language runtimes wire up calls that JIT as well as… Talk on
From Java to Assembly: Down the Rabbit Hole	Joker 2016	2016-10-14
Walks a simple Java method from javac bytecode through HotSpot JIT into native assembly using javap plus HotSpot flags like printCompilation and printInlining… Talk on
JRuby 9000	Jfokus 2016	2016-02-08
Presentation from Charles Nutter (@headius) on optimizing above the JVM with the JRuby 9000 implementation at the Jfokus VM Tech Summit. Full Abstract: In the… Talk on
Upcoming Improvements to JRuby 9000	RubyKaigi 2015	2015-12-11
JRuby 9000 now tracks Ruby 2.2 and ships a new intermediate representation that enables real compiler passes like dead code elimination, constant propagation… Talk on
JRuby 9000 Is Out; Now What?	RubyConf 2015	2015-11-15
JRuby 9000 ships with Ruby 2.2 support and a new IR runtime that enables block JIT and method inlining experiments, and define_method performance moves much… Talk on
Beyond JVM: How the Platform is Evolving for new Languages & Features	GOTO Chicago 2015	2015-05-11
JRuby 9000 accumulates ~29,000 commits to bring Ruby to the JVM and shows concrete wins: switching to invokedynamic removes intermediate dispatch and yields… Talk on
JRuby 9000	RubyConf 2014	2014-11-17
Announcement shows JRuby 9000 targets Ruby 2.1/2.2 compatibility, replaces the execution pipeline with a new optimizing compiler, and implements true native IO… Talk on
The Ruby Implementors panel	dotRB 2013	2013-10-28
Panelists compare concrete implementations: JRuby runs Ruby on the JVM to reuse Java libraries but hurts startup time; RubyMotion forks MacRuby to ship iOS… Panel on
The Future of JRuby	Barcelona Ruby Conference 2013	2013-09-14
Roadmap announces JRuby 9000 IR compiler that emits an intermediate representation for semantic optimizations, targets Ruby 2.x compatibility, and likely drops… Talk on
High Performance Ruby	RubyConf AU 2013	2013-02-20
Shows concrete wins: running JRuby on JVM plus invokeDynamic turns dynamic calls into inlines and yields about an 800% improvement over early JRuby and roughly… Talk on
Why JRuby Works	RubyConf 2012	2012-11-01
Claims JRuby matches MRI compatibility while gaining JVM strengths: lower GC pause times (orders of magnitude less than MRI in benchmarks), real parallel… Talk on
Why JRuby?	Aloha RubyConf 2012	2012-10-08
Explains why J Ruby beats MRI for many real deployments by showing concrete wins not slogans: invoke dynamic optimizations on Java 7 that let the JVM inline… Talk on
High Performance Ruby	GoGaRuCo 2012	2012-09-14
JRuby runs Ruby on the JVM and claims multi× speedups by teaching the JVM Ruby semantics via invokedynamic, using class-level method cache serials and… Talk on
Keynote: Ruby Today, Ruby Forever	RubyConf India 2012	2012-05-14
Ruby adoption is growing from about 1–2 million developers toward Gartner’s 4 million by 2013, with conferences drawing 850 at RubyConf, 1,800 at RailsConf and… Talk on
Jruby Polyglot Heaven	RubyConf 2011	2011-09-29
JRuby runs JVM languages side by side and shows concrete results: Ruby 1.9 support is about 80–90% complete, the repo has 14,500+ commits and a 165 release… Talk on
JRuby Hacking Guide	RubyConf 2010	2010-11-11
JRuby 1.6 targets an RC around December 10 and aims to finish 1.9 support; code builds with Java (and a simple ant step) from GitHub so contributors can fork… Talk on
JRuby Everywhere!	RubyConf 2009	2009-11-19
JRuby announces a concrete release and working demos: JRuby 1.4 released Nov 2 with ~300 bug fixes and Ruby 1.8.7 compatibility, provides native installers for… Talk on
Ruby Mutants	RubyConf 2009	2009-11-19
A new Ruby-like language called Dubbie compiles Ruby syntax into JVM class files via a pipeline mostly written in Ruby, with pluggable backends and a Java… Talk on
JRuby: What, Why, How... Try It Now	RubyConf 2008	2008-11-06
JRuby 1.5 ships after 1,500 user-reported bug fixes and ~3,000 revisions since last year and claims microbenchmark-leading performance by leveraging the… Talk on
JRuby: Ruby for the JVM	RubyConf 2007	2007-11-02
JRuby implements Ruby 1.8 on the JVM with a full 1.8 compiler that emits Java bytecode and an interpreter that falls back to JIT, ships a 1.0.2 release that… Talk on
JRuby: Not Just Another Ruby Implementation	MountainWest RubyConf 2007	2007-03-16
JRuby aims to run real Ruby apps on the JVM and demonstrates concrete results: passes 98% of Rails unit tests, jruby-complete single-jar distribution for easy… Talk on
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