A nasty vulnerability was found in sbt! ⚠️ Specifically, a command injection flaw affecting Windows users when resolving source dependencies. The good news is that it's already fixed. If you build on Windows, make sure to update your project to sbt 1.12.8 or sbt 2.0.0-RC10 immediately.

Fixing a Command Injection Vulnerability in sbt

During our ongoing work on sbt 2, we discovered and fixed a command injection vulnerability affecting sbt on Windows.

#scala

Go check out ZIO Blocks! It's a collection of independent libraries with zero or minimal dependencies. Despite the name, ZIO is not needed to use them. ☝️

GitHub

GitHub - zio/zio-blocks: Powerful, joyful building blocks for modern cloud-native applications.

Powerful, joyful building blocks for modern cloud-native applications. - zio/zio-blocks

#scala

The whole Scala ecosystem was mapped! 🗺️ Ok, maybe not the whole, but this roadmap is pretty thorough. Nice to see a clear path that doesn't throw you straight into category theory on day one. Definitely worth a bookmark if you're learning. 🔖

roadmap.sh

Scala Roadmap

Step-by-step guide to become a Scala developer in 2026

#scala

Claude's default method for searching APIs is very inefficient and costly, it usually searches and parses Javadocs or even downloads and extracts JARs. 💰 Cellar lets you instantly query the public API of any Maven JVM dependency right from the terminal. 👇

GitHub

GitHub - VirtusLab/cellar: CLI tool for coding agents and developers to query the public API of any Maven JVM dependency — get symbol signatures, list packages, search by name, and inspect dependency trees. Powered by Coursier and tasty-query.

CLI tool for coding agents and developers to query the public API of any Maven JVM dependency — get symbol signatures, list packages, search by n...

#scala

Another RC version of sbt 2.0 is out! 🎉 There are several improvements, but I really like to see the run task being non-blocking! 🔀

sbt 2.0.0-RC10 · eed3si9n

#scala

Mirrors are garbage. That's the core message from Kalin Rudnicki's talk at Func Prog Sweden! #scala

Compile-time validation in Scala 3 is beautiful. By using inline extension methods, we can throw compiler errors for invalid data before the code even runs. #scala

Kotlin Native looks very promising! See how it stacks up against Scala Native 👇 https://marioarias.hashnode.dev/comparing-programming-languages-xii-the-native-showdown #scala #kotlin

The Scala 2 optimizer has been ported to Scala 3, starting in version 3.8.3-RC3. It's bringing 10-30% faster execution for high-level functional code using smart inlining 🧠

Porting the Scala 2 optimizer to Scala 3

Making your high-level maintainable code as fast as low-level harder-to-read code

#scala

Scala Native + Tapir + htmx. The ultimate combo! ❤️

The Scala compiler doesn't type-check Chuck Norris's code. Chuck Norris type-checks the compiler. #scala

Who gets excited about a logging framework? You will when you see these benchmarks. 👇 Scribe gives you detailed method and line number logging with absolute zero runtime cost. How? It uses Scala macros to bake the info in at compile time. Plus, it brings that pure speed to the JVM, Scala.js, and Scala Native! 🚀 It is completely worth spending a few minutes today to rip out your existing logging library and replace it with this! 💎 #scala

GitHub

GitHub - outr/scribe: The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.

The fastest logging library in the world. Built from scratch in Scala and programmatically configurable. - outr/scribe

Scalex looks like a "new" mini language server designed to provide context to LLMs for better searching. Looks interesting, has anyone tried it yet? It feels like there is a huge overlap with Metals 2.

GitHub

GitHub - nguyenyou/scalex: Scala code intelligence for coding agents. Zero Build Server. Zero Compilation. Just answers.

Scala code intelligence for coding agents. Zero Build Server. Zero Compilation. Just answers. - nguyenyou/scalex

#scala

Another piece of the puzzle has been updated to Scala Native 0.5, this time it's fs2! 🎉 Now let's wait for http4s, skunk and weaver to join the party! ⌛

GitHub

Release v3.13.0 · typelevel/fs2

Cats Effect 3.7.0 and Scala Native 0.5 support with real multi-threading on Scala Native! Features Use virtual threads when possible for JdkUnixSo...

#scala

I'm currently working on a tiny library and the truth is, that at least 90 % of the code are bridges to a different json codecs and db backends. And I haven't even started with the ZIO interop 🤷 I also don't want to have a full-fledged effect system baked in the standard library, but just imagine the developer experience if cats-effect and ZIO shared a single, unified API! https://medium.com/@w.pitula/rage-against-the-plurality-of-effect-systems-c0b3b0be0f69 #scala

Scoverage is one of the first plugins I add to any new project. The compiler team finally did the same and found some breakages - but they're already fixing them! 👏 Hopeful that Scoverage in Scala 3 hits full parity with Scala 2 very soon.🤞 #scala

Hardening Scoverage Support in Scala 3

We

I'm trying to implement Noel Welsh's better encoding, but I'm not sure if it's suitable for such a small library. Also, I honestly don't think I fully understand it! 😀 I would appreciate any comments or feedback. 🙏 #scala

http4s is a backbone for many mission-critical systems. I'm pleased to share that "Pure functional HTTP APIs in #Scala" by Jens Grassel is free once again, and this time it's for good! 📖 It's a fantastic resource for anyone looking to build robust, battle-tested web backends.

Pure functional HTTP APIs in Scala

A book about developing purely functional HTTP APIs with Scala using http4s, Doobie, Cats and other libraries including a chapter about upgrading t...

I used to think LLMs would make #Python and other mainstream languages dominate forever. But if AI is writing the code, you don't need a language just because it's easy for beginners or hiring. You don't even need to fear refactoring anymore. What you really need is a language that catches the AI's mistakes. You need strong compilers and strict types (like #Rust or #Scala) to act as safety nets when the AI messes up. This article changed my perspective 👇

Alexandru Nedelcu

Boring Tech May Become Irrelevant Tech

On programming and personal projects

Cats Effect v3.7.0 is officially here! 🎉 We've been waiting since the RC dropped back in July 2025 and it finally brings what we wanted: support for Scala Native 0.5. 🚀 What does that mean? Full multithreading on LLVM! ⚡️ The changelog is absolutely massive, go read it for yourself 👇

GitHub

Release v3.7.0 · typelevel/cats-effect

This is the fifty-ninth release in the Cats Effect 3.x lineage. It is fully binary compatible with every 3.x release and fully source-compatible wi...

#scala