Sébastien Deleuze

Sébastien Deleuze

@seb.deleuze.fr

Spring AI/Framework @ Broadcom, #WebAssembly since 2016, ex @mixitconf.org‬ staff. https://seb.deleuze.fr

1.2K followers393 following324 posts

Sébastien Deleuze reposted

Suresh
@suresh.dev

OpenJDK 28 EA build 21 (jdk.java.net/28/) is out, with Adaptive Heap Sizing and faster startup for ZGC. IMO this will be huge for reducing memory usage in Java desktop apps like @intellijidea.com and CLI tools where the heap defaults to 25% of RAM. No more -Xmx roulette #jvm #java #kotlin

Sébastien Deleuze reposted

IntelliJ IDEA, a JetBrains IDE
@intellijidea.com

Java and Kotlin by IntelliJ IDEA has reached 1.0! Built together with Cursor, this LSP-based extension release is a major leap toward bringing our JVM technology beyond the IDE – wherever you’re working, whichever editor or agent you use. Read more👇 blog.jetbrains.com/idea/2026/10...

blog.jetbrains.comIntelliJ IDEA's Java and Kotlin for Cursor and VS Code Hits 1.0 - The JetBrains BlogTen weeks ago, we opened up a preview of an LSP-powered extension that brings IntelliJ IDEA's smartness for Java and Kotlin into VS Code and Cursor. As mentioned in that blog post, this is part of a b

Sébastien Deleuze reposted

Simon Willison
@simonwillison.net

"Anthropic told investors on Wednesday distillation accounted for 5 per cent to 7 per cent of revenue" If true, and Q2 revenue was $11.5B, then that's more than half a billion dollars spent by other labs to distill Anthropic's models! www.ft.com/content/1163...

Sébastien Deleuze reposted

Micah
@rincewind.run

if your agents are going to commit crimes, you are legally responsible if you cannot figure out how to prevent your agents from doing crimes, you’re going to have to choose between releasing them and protecting yourself from criminal liability imo this would do more for “ai safety” than a sex cult

Carl Quintanilla@carlquintanilla.bsky.social

(NYT) - Artificial intelligence agents created by Anthropic, acting on their own, tried to gain access to a range of government websites, filled out visa applications on the State Department’s website and sent a fake homicide tip to Philadelphia’s Police Department. www.nytimes.com/2026/10/09/t...

Sébastien Deleuze reposted

Den
@den.dev

We’ve recently moved all PRs in the Model Context Protocol repositories to be limited to collaborators only. Too many low-quality submissions that someone still has to review and triage. We ask that folks start engaging with us directly on Discord for new proposals first.

Sindre Sorhus@sindresorhus.com

Due to AI, I have disabled external pull requests on all my repos. Open source, as we have known it, was fun while it lasted. (It’s been 15 years for me) I will still maintain projects and handle issues.

Sébastien Deleuze reposted

Ryan Hunt
@eqrion.bsky.social

I'm working on this. We're trying to build a developer preview of wasm components running in Firefox, along with getting good docs and toolchain support so that people can try it out easily. Should have more details later this year!

IntentToShip@intenttoship.dev

Gecko: Intent to prototype: WebAssembly Component Model

groups.google.comGecko: Intent to prototype: WebAssembly Component ModelGecko: Intent to prototype: WebAssembly Component Model

Sébastien Deleuze reposted

Erik C. Thauvin
@erik.thauvin.net

JetBrains Air: Building a System of Products for Agentic Software Development #agentic #agents #ai #ide #jetbrains blog.jetbrains.com/blog...

blog.jetbrains.comJetBrains Air: Building a System of Products for Agentic Software Development - The JetBrains BlogAI can produce code. Organizations still have to produce software. Agentic development is changing how software gets made, but it hasn’t changed what it costs to be wrong. Six months ago, we began

Sébastien Deleuze reposted

Suresh
@suresh.dev

Next LTS (JDK 29) is going to be a banger 🔥 Value types, AOT compilation (training runs), Adaptive heap sizing, Structured concurrency, Compact object headers. Can't wait! #jvm #jdk

Erik Österlund@eosterlund.bsky.social

If you are like me and don’t enjoy configuring JVM heap sizes (e.g. -Xms, -Xmx, -XX:SoftMaxHeapSize) then finally ”JEP 546: Adaptive Heap Sizing for ZGC” just became a candidate JEP: openjdk.org/jeps/546

openjdk.orgJEP 546: Adaptive Heap Sizing for ZGCEnhance the Z Garbage Collector (ZGC) to adaptively adjust the size of the heap based on the resources available, the application's needs, and the needs of neighboring applications contending for the same resources.

Sébastien Deleuze reposted

Daniel Garnier-Moiroux
@garnier.wf

Hey Spring fam 🍃 My early access book "Testing Spring Boot Applications" with @manning.com is Deal of The Day. Get 45% off the book, and a selection of other testing books, here: hubs.la/Q03-d27Y0 First 4 chapters online, the 5th is coming out soon, and putting finishing touches to chapter 6.

Sébastien Deleuze reposted

Thibaud - kakawait
@thibaud.dev

Mon tout premier article de blog est en ligne 🎉 Après 3 ans à manager une équipe, j'ai fait marche arrière pour redevenir dev. Pas un échec, mais une autre voie, que je raconte dans l'article. Preneur de vos retours, c'est mon coup d'essai 🙏 go.thibaud.dev/4x9m #StaffEng #dev #TechCareer #RETEX

go.thibaud.devPourquoi j'ai lâché le management pour redevenir devRétrospective sur 3 ans d'Engineering Management et mon choix de revenir vers la voie de contributeur individuel.
Sébastien Deleuze
@seb.deleuze.fr

En route pour le Spring Meetup Paris où je parlerai de Kotlin en compagnie de @starbuxman.joshlong.com, mais également de la roadmap Spring AI qui devrait intéresser également les développeurs Java. Inscrivez-vous ! www.meetup.com/spring-meetu...

meetup.comSoirée 15 ans de Kotlin, Mon, Sep 7, 2026, 6:45 PM | MeetupHello à toutes et tous, Merci à **Happn** de nous accueillir pour une soirée anniversaire spéciale, pour les 15 ans de Kotlin, en partenariat avec **JetBrains**! En plus d
Sébastien Deleuze
@seb.deleuze.fr

Lundi prochain, je serai à Paris pour une soirée anniversaire organisée par le #Spring Meetup pour fêter avec @starbuxman.joshlong.com les 15 ans de #Kotlin! Je vous partagerai également des informations sur les roadmaps Spring AI/Framework. Pour vous inscrire: www.meetup.com/fr-fr/spring....

meetup.comSoirée 15 ans de Kotlin, lun. 7 sept. 2026, 18:45 | MeetupHello à toutes et tous, Merci à **Happn** de nous accueillir pour une soirée anniversaire spéciale, pour les 15 ans de Kotlin, en partenariat avec **JetBrains**! En plus d

Sébastien Deleuze reposted

Brice Dutheil
@bricedutheil.bsky.social

#Java Structured Concurrency to be finalized in JDK 28? > This JEP proposes to finalize Structured Concurrency in JDK 28, with no changes from JDK 27. I need to see how it fares against #Kotlin #Coroutines that has a great structured concurrency story. openjdk.org/jeps/8389757

openjdk.orgJEP draft: Structured ConcurrencySimplify concurrent programming by introducing an API for structured concurrency. Structured concurrency treats groups of related tasks running in different threads as single units of work, thereby streamlining error handling and cancellation, improving reliability, and enhancing observability.

Sébastien Deleuze reposted

Erik C. Thauvin
@erik.thauvin.net

Value Classes Still Need Compiler Sympathy #java #jdk #valueclasses johan-sjolen.github.io/...

johan-sjolen.github.ioValue Classes Still Need Compiler SympathyThis post discusses preview features in JDK 28\nJEP 401, a major Valhalla milestone, has been integrated as a preview feature in JDK 28. This is very exciting, as value classes increase both our ability to communicate the semantics of our programs to others and the optimization opportunities available to the JVM.\nHowever, I have seen people online essentially taking a “Value all the classes!” approach to this. I worry that there is a belief that ordinary classes give you a floor on performance, and that value classes will do their best to raise you above that floor, but won’t ever take you below it. Unfortunately, that is not true. A well-intentioned program may put the JVM into a situation where a flattened representation is faster for some methods, and a reference representation is faster for others. When these methods interact, the JVM is forced to convert between the two representations. I want value classes to be more than just magic, so today I am going to show you what the JVM is capable of right now, and where its limitations are. I hope that with this you’ll have some context for reasoning about the code that you (or your AI agent) write.\n

Sébastien Deleuze reposted

Spring AI
@spring-ai.bsky.social

Spring AI 2.0.1 is live 🎉 First maintenance release since 2.0 GA - 80+ issues/PRs, 7 CVEs, and some frequently-requested features landed: configurable tool call limits, OpenAI audio streaming, Google GenAI image generation, and a big round of streaming/tool-calling fixes. spring.io/blog/2026/08...

Sébastien Deleuze reposted

Michel
@michel.poula.in

Airbus vient de bouger de AWS vers le français Scaleway pour son infrastructure critique. La souveraineté numérique pour échapper au CLOUD Act de Donald Trump.

usine-digitale.frCloud souverain : Airbus choisit Scaleway pour l’hébergement de ses applications critiquesDéjà client des grands fournisseurs de cloud américains, Airbus a choisi Scaleway pour héberger une partie de ses applications sensibles dans un environnement souverain. Pour le fournisseur français, ...
Sébastien Deleuze
@seb.deleuze.fr

I am actively collaborating with the Kotlin team on this Compose HTML for Server Side rendering thing, plan to experiment integration with Spring, and believe that with hydration support on client side that could be a very powerful and popular feature. blog.jetbrains.com/kotlin/2026/...

blog.jetbrains.comExploring Compose HTML for Server Side Rendering - The JetBrains BlogExploring Compose HTML as a solution for SSR on JVM, offering a type-safe way for JVM developers to build server-rendered UI without separate templating languages.

Sébastien Deleuze reposted

Spring Tools
@springtools.bsky.social

Our extension for Claude Code can tell your agent what seems to be wrong with your project from a Spring perspective by deliverung diagnostics information directly to the agent - pretty nice to safe tokens and to enhance the agent with more Spring smartness 😎🥳

Sébastien Deleuze reposted

Sarah Drasner
@sarahedo.bsky.social

We (Chrome) published a big paper about security work that's important to share. It shouldn’t surprise anyone that open source software is getting hammered by AI, and people are looking for bugs: for bounties, for hacking purposes, and to help, more than ever before. blog.google/security/chr...

Sébastien Deleuze reposted

IntelliJ IDEA, a JetBrains IDE
@intellijidea.com

The IntelliJ IDEA 2026.2 release is here! Explore our What’s New page for a complete overview of the key new features, including detailed explanations and demos. 👇 www.jetbrains.com/idea/whatsnew/

jetbrains.comWhat's New in IntelliJ IDEA 2026.2Discover IntelliJ IDEA 2026.2 with agent skills, third-party AI completion providers, native GitHub Copilot, logpoints, dependency completion, early Gradle 10 support, Java 27, Kotlin 2.4, Spring insi...

Sébastien Deleuze reposted

Kotlin by JetBrains
@kotlinlang.org

Sébastien Deleuze and Josh Long get into Kotlin for backend on the episode of A Bootiful Podcast, including the Kotlin LSP, how closely the Spring and Kotlin teams now work together, and their impressions from KotlinConf 2026. It’s well worth a listen 🎧 https://kotl.in/5fm5x7

Sébastien Deleuze reposted

Christian Tzolov
@tzolov.bsky.social

LLMs: text-in, text-out. Enterprise code: structured-in, structured-out. #SpringAI 2.0 adds two switches on .entity(): • validateSchema() — retries with the error fed back • useProviderStructuredOutput() — pins the schema at the provider spring.io/blog/2026/06... #Java #AI #StructuredOutput