Oliver Weiler

Holy moly! I wasn't aware that @intellijidea.com respects .sdkmanrc files!

Kotlin’s companions are getting an upgrade. 👀 Kotlin 2.5.0 introduces experimental companion blocks – a lightweight alternative to companion objects. Learn what they unlock and how to enable them 👇 https://kotl.in/aby7vp

Smaller object headers = less memory, fewer GC pauses, lower latency. Billy Korando breaks down the JVM trick that boosts performance. #Java #JVM #Performance

If you care for the evolution of the Java ecosystem, consider expressing your opinion on github.com/CycloneDX/cy...

🎯 JEP 544 proposed to target JDK 28 Title: Ahead-of-Time Code Compilation Type: feature Component: hotspot / compiler Release: 28 See openjdk.org/jeps/544

What are some of your favorite features in Java 27? Mine's surely going to be compact object headers. Reduce the heap of your programs by 10-20% without changing application logic or code. :D

You’ve gotta use AI because it’s the future. But also it’ll take your job. But also it’ll create a paradise on earth and solve most of our problems. But also it’ll end humanity soon. But also you’ll get left behind if you don’t use it right now.

Available as an article, too bell-sw.com/blog/how-to-...

JReleaser 1.26.0 has been released! andresalmiray.com/jreleaser-1-...

Thanks to coding agents, Jenesis has matured at a speed I did not expect, and it has become the build tool for Java I would have liked to see a decade ago. I had agents build hundreds of projects, and it works, so try it out. I moved the entire shebang to a GitHub org: github.com/jenesis

I am convinced that AI will not take away developer jobs. Instead, it will require even more developers to clean up the mess.

Show the world your love for Absolum with the @fangamer.com official merch! Shop new shirts and pins now, plus the game's 2LP vinyl soundtrack: https://www.fangamer.com/collections/absolum

Right, so it finally happened. Had to review AI slop at work. Colleague replies to review comments: tis what Claude suggested #facepalm #meatproxy #aislop www.linkedin.com/pulse/dont-m...

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/...

The more AI I use for writing code, the more I come to the conclusion that this is doing the wrong thing faster. AI Coding for prototyping, learning, reviewing is great. For everything else, it leaves developers with complex indirections, hand-rolled duplications and an unmaintainable blob.

The first part of OpenJDK’s Project Valhalla, JEP 401 (Value Objects), has been integrated into JDK 28 as a preview feature and is now available in the early-access builds. More information: openjdk.org/projects/val... #JDK28 #OpenJDK #Java

Did you know? No need to always rebuild a container image when the base changes. We can rebase it: replace the runtime base and keep the upper layers unchanged. Buildpacks make it a first-class operation with pack rebase. BuildKit can do smth similar with COPY --link and a cache.

And here's @rendle.dev's blog post about how this works, why it's a live workshop (as opposed to a video or something), why we're using Claude, what's in the workshop, and more... emmz.dev/posts/new-wo...

npm is now scanning packages for malware at publish time before they become available for consumption

This is one of the most useful ideas I ever learned. www.paulgraham.com/top.html

TestLens now Generally Available! We are proud to announce that TestLens is now available for all GitHub users! If you develop with Java/Kotlin on GitHub, TestLens is here to ease your pain with flakiness in your test pipelines. testlens.app/blog/2026/07...

var0.xyz/posts/perfec...

Hi Spring fans! Spring Boot 4.1 is here and with it a ton of amazing features. I'm delighted to have had the opportunity to sit down with Moritz Halbritter, of Spring Boot and Spring Initializr fame, to talk about some of the amazing features. https://www.podbean.com/ew/pb-i8j4u-1b0abfa

JobRunr is now on Spring Initializr. 🚀 We could not be prouder. Add JobRunr from the dependency list at start.spring.io, generate, and background jobs are wired into your Spring Boot app. Massive thanks to @starbuxman.joshlong.com & @spring.io 🙏 #Java #SpringBoot #opensource #oss

This @graalvm.org 25.1 release is the first in our series of monthly innovation releases that bring the latest performance improvements to our users for free. If you are using Java 25, definitely try the upgrade!

also the ceos of ai companies that trained their models on everybody else's work then turning round and complaining about people stealing their shit is fucking hilarious to me

ffmpeg is an amazing piece of software, but it should *always* be run in a sandbox when processing untrusted input. Modern browsers decode videos in a sandbox for the same reason. Handling complex codecs in an entirely secure way remains an unsolved problem in software engineering.

No, everyone is not using AI for everything. gabrielweinberg.com/p/people-are... People are consuming AI like they eat meat: some are embracing it, some are limiting their use of it, and some are avoiding it altogether.

Spring Boot 4.1.0 available now! spring.io/blog/2026/06... See the blog post for the highlights! #java #spring #springboot

Out of the 1000 most downloaded artifacts from Maven Central, more than a third are not actively maintained. commons-io is the second most downloaded artifact. That is a little bit sad. github.com/raphw/jenesi...

"Java AOT in Production at Netflix" Interesting to see real-world numbers from Netflix on Project Leyden. www.youtube.com/watch?v=4kEh... #java #leyden

Kotlin is moving toward name-based destructuring – new syntax that will make reordering and moving properties a breeze. No worries: There will be a long migration period with compiler and IDE support. Learn what’s changing and how the migration will work 👇 https://kotl.in/8nny1l

More information why you need a local mirror for #Apache #Maven: www.sonatype.com/blog/maven-c...

A local AWS emulator that starts in 24 ms and uses just 13 MiB of idle memory? Meet Floci — free, open-source, and powered by @graalvm.org 🚀 github.com/floci-io/floci

Learn Python the Hard Way Was Right About One Thing fagnerbrack.com/learn-python...

🎯 JEP 534 proposed to target JDK 27 Title: Compact Object Headers by Default Type: feature Component: hotspot / runtime Release: 27 See openjdk.org/jeps/534

AI and CEOs

Flaky GitHub PRs are an annoying reality. Just when you think a change is good to merge, you are greeted with an ❌. To unblock your PR, you need to rerun lengthy test pipelines just because of one rogue test. TestLens can help you: testlens.app/blog/2027/05... #Java #JUnit #Gradle #Maven

📑There are now more edge cases, richer code samples, and better structure. Explore the updated docs and see what’s new for your backend 👇 https://kotl.in/o09xzu

If I had invested over 1.000.000.000.000 $ in a technology, I would certainly also invest in a massive marketing campaign to convince the perceived mainstream that this technology is "inevitable", resistance is futile, and whoever doesn't follow will be left behind.

"AI does not work - but we have someone to blame" dierk.github.io/Home/AiDoesN...

Spring Boot 4.1.0-RC1 available now Notable new features include: - Support for OpenTelemetry SDK environment variables - HTTP Client SSRF Mitigation with InetAddressFilter - Support for LazyConnectionDataSourceProxy spring.io/blog/2026/04... #spring #springboot #java

You can use support for the @sdkman.io .sdkmanrc file in @intellijidea.com to download #Java26, Set as project JDK and navigate to Project Structure. #Java #IntelliJIDEA

Announcing the Zero Token architecture. Instead of burning AI tokens, you learn to think for yourself, and complete tasks using your brain.

📢 Kotlin 2.3.20 is out! Learn more: ➡️ kotl.in/2-3-20