Johnrose
John Rose - JVM Architect
John Rose is a lead or guide on Project Panama (native interconnect), the Da Vinci Machine Project (JVM futures), Project Valhalla (polymorphism and value types), Arrays 2.0, Metropolis (Java-on-Java RI), and JVM security.
He has worked on Java technology at Sun then Oracle since 1995, contributing widely to functionality and performance of the Sun/JDK stack, touching everything from hardware architecture to code generators to libraries to programming languages.
Past projects include JVM invokedynamic, Java inner classes, Pack200 (archive format), the initial port of HotSpot (to SPARC), the Unsafe API, and various dynamic, parallel, and hybrid languages, including Common Lisp, Scheme (“esh”), and dynamic bindings for C++.
Posts
- JEP targeted to JDK 25: 515: Ahead-of-Time Method Profiling on July 18, 2025
- JEP targeted to JDK 25: 514: Ahead-of-Time Command-Line Ergonomics on June 26, 2025
- Ubuntu Ships Java, Spring, AOT on June 4, 2025
- Refining var-handles in Valhalla on March 28, 2025
- Encodings for Flattened Heap Values on June 11, 2024
- Introduction: Q-descriptors and v-bytecodes on August 22, 2023
- Using Computed Constants to Manage Static State in Leyden on August 12, 2023
- State of Valhalla, Section 3: JVM Model on April 21, 2021
- Early steps on the road to customization on August 26, 2020
- The pattern in the Loom (a blanket statement) on February 4, 2020
- The Isthmus in the VM on March 18, 2014
Videos
- The Static Dynamic JVM – A Many Layered Dive #JVMLS on January 11, 2026
- JVMLS - Project Leyden on September 7, 2023
- Vectors and the Numerics on the JVM on July 29, 2019
- The Invocation Game on April 20, 2017
- Your next JVM: Panama, Valhalla, Metropolis on April 17, 2017
- VM Futures - A Few More Flickers in the Crystal Ball on August 1, 2016
- New Bytecodes, New Objects on August 11, 2015
- Evolving the JVM - Principles & Directions on July 31, 2014
Podcasts
- Episode 42 “From Sumatra to Panama, from Babylon to Valhalla” with John Rose on December 10, 2025
- Episode 7 “The Vector API” with John Rose and Paul Sandoz on November 17, 2020