Sébastien Deleuze
@seb.deleuze.fr
Spring @ Broadcom, #WebAssembly since 2016, ex @mixitconf.org staff. https://seb.deleuze.fr
My last blog post of the year: Next level Kotlin support in Spring Boot 4.
spring.io/blog/2025/12...
#spring #kotlin
spring.io/blog/2025/12...
#spring #kotlin
December 18, 2025 at 12:46 PM
My last blog post of the year: Next level Kotlin support in Spring Boot 4.
spring.io/blog/2025/12...
#spring #kotlin
spring.io/blog/2025/12...
#spring #kotlin
Plage d’argent, île de Porquerolles
December 13, 2025 at 11:51 AM
Plage d’argent, île de Porquerolles
The unexpected huge wave of positive feedback from the community when I announced it remains one of the most memorable moments of my career. Thanks for that!
December 8, 2025 at 4:28 PM
The unexpected huge wave of positive feedback from the community when I announced it remains one of the most memorable moments of my career. Thanks for that!
I have upgraded Spring PetKlinik, my Kotlin fullstack variant of the original Spring Petclinic, to Spring Boot 4.0.0 (before it was using snapshots). github.com/sdeleuze/spr...
#spring #kotlin
#spring #kotlin
November 30, 2025 at 4:05 PM
I have upgraded Spring PetKlinik, my Kotlin fullstack variant of the original Spring Petclinic, to Spring Boot 4.0.0 (before it was using snapshots). github.com/sdeleuze/spr...
#spring #kotlin
#spring #kotlin
Only 6 days left to benefit of @wasm.io (19-20 March 2026 - Barcelona) early bird cheap conference tickets. I just bought mine! wasm.io #wasm #webassembly
November 28, 2025 at 11:14 AM
Only 6 days left to benefit of @wasm.io (19-20 March 2026 - Barcelona) early bird cheap conference tickets. I just bought mine! wasm.io #wasm #webassembly
Pointe du Raz, Bretagne
September 29, 2025 at 12:19 PM
Pointe du Raz, Bretagne
Presqu’île de Crozon, Bretagne
September 27, 2025 at 1:42 PM
Presqu’île de Crozon, Bretagne
Macro @ Le Puy de Sancy
August 23, 2025 at 12:46 PM
Macro @ Le Puy de Sancy
I have finished Clair Obscur: Expedition 33 main quest. It is and will probably remain the best game I have ever played. And the soundtrack is amazing. Well done @expedition33.bsky.social, kudos to the team!
August 20, 2025 at 6:15 PM
I have finished Clair Obscur: Expedition 33 main quest. It is and will probably remain the best game I have ever played. And the soundtrack is amazing. Well done @expedition33.bsky.social, kudos to the team!
Good morning from the Luberon
July 13, 2025 at 7:53 AM
Good morning from the Luberon
If you want to watch online and live next week (June 4) my talk "Null Safety in Spring applications with JSpecify and NullAway", make sure to register to IntelliJ IDEA Conf 2025, it is free! lp.jetbrains.com/intellij-ide...
May 28, 2025 at 1:12 PM
If you want to watch online and live next week (June 4) my talk "Null Safety in Spring applications with JSpecify and NullAway", make sure to register to IntelliJ IDEA Conf 2025, it is free! lp.jetbrains.com/intellij-ide...
The source code of #Spring Petklinik, the new reference #Kotlin fullstack application I have built for my #KotlinConf and #SpringIO talks, is now available at github.com/sdeleuze/spr....
I will continue to refine it.
I will continue to refine it.
May 26, 2025 at 6:01 AM
The source code of #Spring Petklinik, the new reference #Kotlin fullstack application I have built for my #KotlinConf and #SpringIO talks, is now available at github.com/sdeleuze/spr....
I will continue to refine it.
I will continue to refine it.
@mp911.de is sharing data points about the new Spring Data AOT repositories that have been announced at @springio.net. Double the benefits of Spring AOT mode 🤩
May 23, 2025 at 8:36 AM
@mp911.de is sharing data points about the new Spring Data AOT repositories that have been announced at @springio.net. Double the benefits of Spring AOT mode 🤩
Today, I am presenting 2 talks at @springio.net: Null Safety in Java with JSpecify and NullAway at 9:05 (auditorium) and Next level Kotlin support in Spring Boot 4 at 17:00 (room 6). Lot of demos, don’t miss them!
May 23, 2025 at 5:54 AM
Today, I am presenting 2 talks at @springio.net: Null Safety in Java with JSpecify and NullAway at 9:05 (auditorium) and Next level Kotlin support in Spring Boot 4 at 17:00 (room 6). Lot of demos, don’t miss them!
Rod Johnson sharing his love for Spring + Kotlin on #KotlinConf main stage.
May 22, 2025 at 8:38 AM
Rod Johnson sharing his love for Spring + Kotlin on #KotlinConf main stage.
On my way to Copenhagen for @kotlinconf.com
May 21, 2025 at 8:00 AM
On my way to Copenhagen for @kotlinconf.com
I spent a couple of days working on a new reference application for the talk "Next level Kotlin support in Spring Boot 4" that I will present this week at @kotlinconf.com and @springio.net. Be ready for a few surprises ...
May 20, 2025 at 10:04 AM
I spent a couple of days working on a new reference application for the talk "Next level Kotlin support in Spring Boot 4" that I will present this week at @kotlinconf.com and @springio.net. Be ready for a few surprises ...
AOT Method Profiling JEP status has changed to candidate. openjdk.org/jeps/515
In my latest benchmark with Spring Petclinic, it allows to speedup the warmup compared to the regular JIT (red line versus blue one).
Stabilized peak performance is currently slightly lower, but hopefully will be fixed.
In my latest benchmark with Spring Petclinic, it allows to speedup the warmup compared to the regular JIT (red line versus blue one).
Stabilized peak performance is currently slightly lower, but hopefully will be fixed.
May 15, 2025 at 8:32 AM
AOT Method Profiling JEP status has changed to candidate. openjdk.org/jeps/515
In my latest benchmark with Spring Petclinic, it allows to speedup the warmup compared to the regular JIT (red line versus blue one).
Stabilized peak performance is currently slightly lower, but hopefully will be fixed.
In my latest benchmark with Spring Petclinic, it allows to speedup the warmup compared to the regular JIT (red line versus blue one).
Stabilized peak performance is currently slightly lower, but hopefully will be fixed.
Today I am at JPrime conference to present my talk about Runtime Efficiency with Spring. If you are there, don’t be shy, I am available to discuss anything Spring related!
May 14, 2025 at 8:52 AM
Today I am at JPrime conference to present my talk about Runtime Efficiency with Spring. If you are there, don’t be shy, I am available to discuss anything Spring related!
Les vidéos de mes 2 talks @devoxx.fr sur l’optimisation d’applications Spring Boot avec Project Leyden (youtu.be/4EAxhhSWgw4?...) et Null Safety (youtu.be/F_Qyo1cCpvY?...) viennent d’être publiées !
May 13, 2025 at 9:54 AM
Les vidéos de mes 2 talks @devoxx.fr sur l’optimisation d’applications Spring Boot avec Project Leyden (youtu.be/4EAxhhSWgw4?...) et Null Safety (youtu.be/F_Qyo1cCpvY?...) viennent d’être publiées !
Amazing game, highly recommended!
April 28, 2025 at 6:27 AM
Amazing game, highly recommended!
You may have missed it, but the @graalvm.org team has recently open-sourced a variant of native image called web image, which compiles Java bytecode to WebAssembly bytecode instead of a native executable.
April 27, 2025 at 1:00 PM
You may have missed it, but the @graalvm.org team has recently open-sourced a variant of native image called web image, which compiles Java bytecode to WebAssembly bytecode instead of a native executable.