One of the most effective guardrails that you can put around AI generated code is mutation testing, since it keeps in check the tests that keep subsequently in check the code. Highly recommend it especially while riding this hype wave of AI

Henry Coles@pitest.bsky.social · 4mo ago

Pleased to see mutation testing and pitest on the ThoughtWorks radar www.thoughtworks.com/radar/techni... As they point out, it's more relevant than ever in the era of AI generated code and tests. And of course the way to use it most effectively on the jvm is www.arcmutate.com #java #kotlin #ai

More and more, I hear devs saying that when they hit their limit - or when e.g. Claude is down (which happens increasingly often) - they stop working. I guess this is what the hyperscalers want: total reliance.

Jason Gorman@jasongorman.bsky.social · 4mo ago

Anthropic: "We're changing our token limit windows" Developers who can do their jobs: ¯\_(ツ)_/¯

#OpenRewrite v8.77.0 is out! 🚀 🔷 C# pattern matching & typed captures 🍃 Spring RestTemplate → RestClient ☕ JAX-RS to Spring MVC 🔒 OWASP Cryptographic Failures 🧪 PowerMock & AssertThrows fixes 📋 CopyValue for YAML & .properties 🔧 Maven proxy settings from settings.xml 📑 JavaDoc to /// Markdown

Turns out mutation testing is effective for making sure LLM-written tests actually do something useful.

TDD's like the brakes on your car. It enables you to get there *sooner* (presuming you wish to arrive in one piece). codemanship.wordpress.com/2026/02/08/t...

“TDD Slows Me Down”. Good.

The illusion of productivity in software development can be very seductive. At the start of my career, I felt most productive when I was able to write code uninterrupted for hours. I even thought t…

codemanship.wordpress.com

What is the best guardrail to avoid AI making a mess of your codebase? Create tests FIRST to build a safe net around the playground where your AI can do its “magic”.

Jason Gorman@jasongorman.bsky.social · 6mo ago

Why does TDD work so well with "AI"-assisted coding? I'm glad you asked. codemanship.wordpress.com/2026/01/09/w...

www.sonarsource.com/blog/ai-codi... Great article that highlights a dilemma a lot of developers are facing right now: trusting the AI-generated code. The amount of effort and attention needed is far greater than with code written by a colleague.

Hola Java devs! 👋 The #SonarQube AI Code Assurance #article is LIVE on @foojay.io ! 🎉 Stop just finding bugs. 🛑 Use SonarQube's new AI "Magic Button" to auto-fix them instantly! 🤯🪄 Crush that tech debt fast. 🚀☕️ #Java #AI @sonarsource.bsky.social foojay.io/today/sonarq...

Your tests should give you confidence, not slow you down or break on every refactor. Marco talks with J. B. Rainsberger, TDD coach and software consultant, about how TDD actually works and what most teams get wrong about testing. Full episode: https://youtu.be/j0NjFsb-at8

Join us for our last session at the ING Leeuwarden office in two weeks! As Elias mentioned we'll have two great tech talks for you in store.

Elias Nogueira 🇧🇷🇳🇱@eliasnogueira.com · 7mo ago

Two hands-on tech talks at @jugnoord.bsky.social : - JobRunr in Practice — async jobs in Java with @koturk.nl - Simple math behind AI — vector computation & FP precision with Marianne Hoornenborg 📅 20 Jan 📍 ING Leeuwarden 🎟️

blog.jetbrains.com/kotlin/2025/... real life code examples that showcase how Kotlin can improve the quality of your codebase, by leveraging features built in the language

Evaluating Kotlin in Real Projects | The Kotlin Blog

Learn how to move Kotlin from tests to production, avoid Java-style pitfalls, and write clean, idiomatic Kotlin in real projects.

blog.jetbrains.com

Short blog, but I think it really hits the spot on the skills great software engineers have 👍 terriblesoftware.org/2025/11/25/w...

What Actually Makes You Senior

The one skill that separates senior engineers from everyone else isn’t technical. It’s the ability to take ambiguous problems and make them concrete.Retry

terriblesoftware.org

JUnit is undoubtedly one of the most important projects in the #Java ecosystem. And it's 100% free and open! Let me be frank: If we can't get THIS project to the point where a single maintainer can focus on it, then what does that say about our commitment to Free & Open Source Software? 1/3 ⏩

Support JUnit

JUnit is maintained by a team of passionate volunteers. This is your chance to give back and support the project!

steady.page

blog.jetbrains.com/kotlin/2025/... great blog post that proves why moving to Kotlin is a good choice. @jlengrand.bsky.social and I can vouch for that 😉

Helping Decision‑Makers Say Yes to Kotlin | The Kotlin Blog

Want to show Kotlin’s value in plain terms? Learn how to link productivity, quality, and developer satisfaction to measurable ROI.

blog.jetbrains.com

Exciting News 🎉 Spring Boot 4.0.0 is here: spring.io/blog/2025/11...

Spring Boot 4.0.0 available now

Level up your Java code and explore what Spring can do for you.

spring.io

When I introduce mutation testing to teams on the Code Craft training workshop, it's invariably one of those "How did this not occur to us before?" moments. "Is our code broken and we don't know it?" Let's break it and see if any of your tests fail.

I'm documenting Spring Boot 4 features with: ✅ Code examples ✅ Video tutorials ✅ Blog deep-dives All organized in one central repo 👇 github.com/danvega/sb4

At this year's @devoxx.com I had a chat with @smarks.bsky.social on ensuring immutable collections when creating a Java record. His suggestion was interesting enough to warrant a new blog post on the subject: codeadventures.littlebluefrog.nl/posts/09-col...

Efficient record immutability with List::copyOf

I’ve been talking so much about the Java record and immutability the past year that others are starting to refer to me when they run into this subject. However, there has been one thing that has been ...

codeadventures.littlebluefrog.nl

Spring Framework 7.0 is now GA! Including Java 25 (with Java 17 baseline), Jakarta EE 11, JSpecify null-safety, Jackson 3.0, Kotlin 2.2, JUnit 6.0, plus programmatic bean registration, JmsClient, API versioning, HTTP Interface Client, RestTestClient & more: spring.io/blog/2025/11...

Spring Framework 7.0 General Availability

Level up your Java code and explore what Spring can do for you.

spring.io

I have a technique I call incompetence-based-mutation-testing. Start making some changes. Bork everything, comment out half the existing code to just make stuff compile. Run tests. Watch tests pass. Stop refactoring, go have a stern word with the tests.

The reason for creating tests is not to achieve 80% code coverage, but to gain the assurance that the application will still work after a change.

Nice to see @balarawool.bsky.social 's talk at #Devoxx on the featured talks list 🤩 It's a great overview, often with some hidden gems, as long as you don't focus too much on the viewer numbers. Some subjects and conferences receive more traffic.

Stephen Colebourne@jodastephen.bsky.social · 10mo ago

TIL about Tech Talks website listing popular talks at conferences. www.techtalksweekly.io/p/tech-talks...

techtrenches.substack.com/p/the-great-... An eye-opener read for whoever is working with tech and sees the AI hype rise above control.

The Great Software Quality Collapse: How We Normalized Catastrophe

The Apple Calculator leaked 32GB of RAM.

techtrenches.substack.com

"...and at the end, all the tests were passing." I've seen them do it. Lots of other devs have seen them do it. LLMs will sometimes cheat to make test suites green. They'll change assertions, comment out failing tests, set them to be ignored, or just plain delete them. Two words: mutation testing

Looking forward to participating in this meetup! In great company too 😄

JUG Noord@jugnoord.bsky.social · 10mo ago

Our next meetup will take place on November 4th at ING Leeuwarden to help you improve your testing with @timtebeek.github.io covering AssertJ and @simoneromani.bsky.social mutating tests for more confidence. Sign up at www.meetup.com/jug-noord/ev... !

#OpenRewrite v8.63.0 is out! 🍂 🚀 Spring Boot to Quarkus migration recipes 🛠️ Oracle/MSSQL to PostgreSQL migrations 🤠 Jackson v3 upgrade recipes 🍁 Support additional Maven (re)sources 🧪 JUnit 5, 6 & Jupiter best practices 🔧 Expanded Hibernate 7 migration ➕ Many more fixes github.com/openrewrite/...

Release v3.16.0 · openrewrite/rewrite-recipe-bom

What's Changed Incorporates the latest versions of OpenRewrite (v8.63.0), the rewrite-gradle-plugin (v7.18.0), and the rewrite-maven-plugin (v6.21.0) to improve code parsing accuracy and recipe ex...

github.com

Closing @devoxx.com with the final talk by @balarawool.bsky.social about virtual threads and the new concurrency features of the JDK

The final reckoning is coming 😄 #devoxx

Finally...

Ending of #devoxx