Java Language & PlatformConference50min
Escaping Java's Allocation Gravity with Value Classes
This talk introduces Java’s Project Valhalla value types through a black hole simulation, showing how they improve immutability, memory efficiency, and performance for heavy numerical workloads. It also explores experimental non-nullable ! syntax, optimization potential, current limitations, and practical benchmarks.
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Clément de TastesSCIAM
Remi ForaxUniversity Gustave Eiffel
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Friday, October 9, 09:30-10:20
TBA 6
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Java 28 will soon introduce, as a preview feature, value classes (JEP 401), a new kind of class that renounces its identity to get better performance.
In this presentation, we will explain what value classes are, how the Java spec was re-interpreted to conjure their existence, how they interact with existing code and what optimizations they enable both on the stack and the heap.
To make it concrete, we'll explore these ideas through the simulation and rendering of a black hole: calculating the trajectories of thousands of light rays through curved spacetime means manipulating huge numbers of vectors, rays, coordinates, and intermediate values.
Finally, we will look ahead at the experimental "!" syntax for null-restricted types, its optimization potential, and the limitations of the current design.
Join us to discover value classes and the current state of Project Valhalla.
In this presentation, we will explain what value classes are, how the Java spec was re-interpreted to conjure their existence, how they interact with existing code and what optimizations they enable both on the stack and the heap.
To make it concrete, we'll explore these ideas through the simulation and rendering of a black hole: calculating the trajectories of thousands of light rays through curved spacetime means manipulating huge numbers of vectors, rays, coordinates, and intermediate values.
Finally, we will look ahead at the experimental "!" syntax for null-restricted types, its optimization potential, and the limitations of the current design.
Join us to discover value classes and the current state of Project Valhalla.
Clément de Tastes
Passionate about software development since getting my first programmable calculator, I have built a solid experience as a tech lead and architect in designing embedded combat systems.
An advocate of clean code, "developer joy" and well-thought-out architectures, I enjoy working on design topics as well as front-end or back-end development.
I recently founded a "JUG-like" meetup in southern France called "Toulon Dev"
An advocate of clean code, "developer joy" and well-thought-out architectures, I enjoy working on design topics as well as front-end or back-end development.
I recently founded a "JUG-like" meetup in southern France called "Toulon Dev"
Remi Forax
Tenured associate professor at Université Gustave Eiffel (Paris) and longtime OpenJDK member researching runtime environments (Java VM, .NET). He has contributed to major Java features including invokedynamic (JSR 292), Lambda (JSR 335), and the Jigsaw module system (JSR 376), and currently works on OpenJDK's Amber (records, pattern matching) and Valhalla (value types) projects. He's also the main contributor to the ASM bytecode library.
A frequent conference speaker (Devoxx France, FOSDEM), he regularly presents on modern Java features like virtual threads, structured concurrency, and value types.
A frequent conference speaker (Devoxx France, FOSDEM), he regularly presents on modern Java features like virtual threads, structured concurrency, and value types.