Project Valhalla

Project Valhalla is augmenting the Java object model with value objects, combining the abstractions of object-oriented programming with the performance characteristics of simple primitives.

2026

• JavaNext Language Features by Dan Smith on June 7, 2026
• On Default Values for Primitive-Like Classes by John Rose on May 21, 2026
• How the JVM Optimizes Generic Code by John Rose on April 19, 2026
• Episode 46 “Java's Plans for 2026” [IJN] by Nicolai Parlog on February 20, 2026
• Optimizing Java Class Metadata in Project Valhalla by Joel Sikström on February 7, 2026
• Java's Plans for 2026 - Inside Java Newscast #104 by Nicolai Parlog on January 8, 2026

2025

• Java's 2025 in Review - Inside Java Newscast #103 by Nicolai Parlog on December 18, 2025
• Valhalla? Python? Withers? Lombok? - Ask the Architects at JavaOne'25 on December 15, 2025
• Episode 42 “From Sumatra to Panama, from Babylon to Valhalla” with John Rose by John Rose, Nicolai Parlog on December 10, 2025
• Help, My Java Object Vanished (and the GC is Not at Fault) by Paul Hübner on November 28, 2025
• Try the New Valhalla EA Build - Inside Java Newscast #100 by Nicolai Parlog on November 6, 2025
• Value Classes Heap Flattening - What to expect from JEP 401 #JVMLS by Frederic Parain on October 31, 2025
• Try Out JEP 401 Value Classes and Objects by Dan Smith on October 27, 2025
• Java for AI by Paul Sandoz on October 14, 2025
• Episode 40 “Amber & Valhalla - Incremental Design and Feature Arcs” with Brian Goetz by Brian Goetz, Nicolai Parlog on September 28, 2025
• A New Model for Java Object Initialization by Dan Smith on July 27, 2025
• Java for AI by Paul Sandoz on May 3, 2025
• Where Is the Java Language Going? by Brian Goetz on April 20, 2025
• Refining var-handles in Valhalla by John Rose on March 28, 2025
• Java's Plans for 2025 - Inside Java Newscast #83 by Nicolai Parlog on January 16, 2025

2024

• Valhalla - Java's Epic Refactor by Brian Goetz on December 16, 2024
• Big News from Project Valhalla - Inside Java Newscast #77 by Nicolai Parlog on October 3, 2024
• Java Initialization 2.0 #JVMLS by Dan Smith on September 1, 2024
• Best of Java Performance - Inside Java Newscast #75 by Ana-Maria Mihalceanu on August 29, 2024
• Type Specialization of Java Generics #JVMLS by Remi Forax & Loris Creantor (guest) on August 27, 2024
• Valhalla - Where Are We? #JVMLS by Brian Goetz on August 23, 2024
• Java and AI? - Inside Java Newscast #72 by Nicolai Parlog on July 4, 2024
• Encodings for Flattened Heap Values by John Rose on June 11, 2024
• Java's Plans for 2024 - Inside Java Newscast #61 by Nicolai Parlog on January 18, 2024

2023

• Brian Goetz Answers Your Java Questions by Brian Goetz, Nicolai Parlog on October 20, 2023
• JVMLS 2023 Keynote by Georges Saab, Mark Reinhold on September 14, 2023
• JVMLS - Value Objects in Valhalla by Dan Smith on September 5, 2023
• Introduction: Q-descriptors and v-bytecodes by John Rose on August 22, 2023
• Design Document on Nullability and Value Types by Brian Goetz on June 2, 2023
• Java Next - From Amber to Loom, from Panama by Nicolai Parlog on April 2, 2023
• Java's Plans for 2023 - Inside Java Newscast #40 by Nicolai Parlog on January 19, 2023

2022

• Quality Outreach Heads-up - Valhalla: LW4 Early-Access Builds by David Delabassee on December 13, 2022
• Java Value Objects in Action with Valhalla - JEP Café #15 by José Paumard on December 6, 2022
• Java To The Future by Billy Korando on September 14, 2022
• Java Q&A - Inside Java Newscast #30 by Nicolai Parlog, Billy Korando on July 28, 2022
• Java Next - From Amber to Loom, from Panama to Valhalla by Nicolai Parlog on May 9, 2022
• Java's Plans for 2022 - Inside Java Newscast #18 by Nicolai Parlog on January 13, 2022

2021

• State of Valhalla by Brian Goetz on December 27, 2021
• The Vector API in JDK 17 by Paul Sandoz on September 23, 2021
• What are they building—and why? 6 questions for the top Java architects by Mark Reinhold, Brian Goetz, Mikael Vidstedt, Ron Pressler on August 6, 2021
• State of Valhalla, Section 3: JVM Model by John Rose, Brian Goetz on April 21, 2021
• New candidate JEP: 401: Primitive Objects (Preview) by Mark Reinhold on March 18, 2021
• New candidate JEP: 402: Unify the Basic Primitives with Objects (Preview) by Mark Reinhold on March 18, 2021

2020

• Terminology update: Primitive Objects by Dan Smith on October 5, 2020
• New candidate JEP: 390: Warnings for Value-Based Classes by Mark Reinhold on September 24, 2020
• Early steps on the road to customization by John Rose on August 26, 2020
• Background: how we got the generics we have by Brian Goetz on June 24, 2020
• State of Valhalla by Brian Goetz on March 1, 2020
• Valhalla - Finding the primitives by Brian Goetz on February 18, 2020

2019

• State of Valhalla by Brian Goetz on December 12, 2019
• Project Valhalla Update by Brian Goetz on July 30, 2019

2018

• InfoQ Podcast with Brian Goetz by Brian Goetz on December 23, 2018
• LWorld: the next steps on the journey to Valhalla by David Simms on July 31, 2018

2017

• Programming with Minimal Values by Maurizio Cimadamore on July 31, 2017
• Your next JVM: Panama, Valhalla, Metropolis by John Rose on April 17, 2017

2016

• Adventures in Valhalla Reflection by Maurizio Cimadamore on August 1, 2016
• Reflection Manifesto by Maurizio Cimadamore on June 30, 2016