Git is a fantastic tool to manage source code. Switching branches is especially easy (if you are a CVS / Subversion veteran you know what I mean). My workflow to implement features is not very surprising: I spawn a new branch from the main branch, I prepare changes in one…

I was recently puzzled by flaky tests in Mutiny. The problem Once in a while we would get build failures in GitHub Action runners, and of course we could not reproduce them locally. Even repeating a test a thousand times would not reproduce the failure seen in the runners. …

I presented today a new publication called Analysing the Performance and Costs of Reactive Programming Libraries in Java at the 8th ACM SIGPLAN International Workshop on Reactive and Event-Based Languages and Systems (REBLS) (a workshop of Splash 2021). This paper was co-authored with Arthur Navarro, Clément Escoffier and Frédéric Le…

So you know ls (often found as /bin/ls), the good old Unix command to list files in a directory. I recently came across exa, a modern replacement for ls. …

After: an academic sabbatical, and a career bet, and a job change, and a minor health issue and my ever first surgery, and a pandemic that greatly disrupts lives across the world… I am happy to announce that my book Vert.x in Action (Asynchronous and Reactive Java) has been published! 🥳 I have so many people to thank that the best is to read the acknowledgements section of the book 😇 Writing this book has been a long and fun journey. I wrote this book with the goal of teaching concepts that will still be relevant in the years to come, and I hope that you will learn useful lessons from it!

It seems like the whole Java ecosystem is going mad these days with GraalVM. Every library and framework wants to proudly work on GraalVM, making GraalVM a new silver bullet for modern Java applications. I expect the GraalVM crazyness to follow the typical hype cycle, and soon we will hear…

This post was originally published on Red Hat Developers, the community to learn, code, and share faster. To read the original post, click here. I had the pleasure to present “Eclipse Vert.x for Dj fun and for profit!” …

Dear JetBrains, Dear Kotlin community, I recently played with Kotlin, first with the interesting RxJava 2 library. I quickly stumbled upon lots of surprising pitfalls in passing lambda expressions. It turns out that unless you had properly read the language reference guide and remember to use the Groovy-style way of passing lambdas, IntelliJ quickly pushes you in the wrong direction and you end up with monster code.