Upgrading from Java 21 to 25: What Actually Breaks
Seven changes between Java 21 and 25 that break builds, startup or behaviour, each reproduced on both JDKs, and how to find them before you …
JEPs
Why Every JVM In Your Fleet Warms Up Alone
Why you can't just copy a JIT-compiled method from one JVM to another: compiled code is a bet on one specific JVM's state. Identity, …
Hello Java 27! Have You Been Working Out?
Java 27 is like that friend that you haven't seen all summer, and when you finally see them again it's clear that they spent a lot of time …
Your TLS Stack Is Lying to You About Zero-Copy
In a zero-allocation runtime, SSLEngine becomes a structural mismatch. It keeps TLS on the heap-facing side of the JVM...
Scoped Values: Why I Banned ThreadLocal in Exeris
Why ThreadLocal kills performance under Project Loom and how the Exeris Kernel uses Scoped Values for true zero-copy architecture.
How to Use Java as a Scripting Language
Discover how Java has evolved into a powerful scripting language, eliminating boilerplate and enabling instant execution for automation …
How is Leyden improving Java Performance? Part 1 of 3
In this series of 3 blog posts we will explain how OpenJDK project Leyden is helping to improve a specific area of performance where Java …
Java 26: What’s New?
This article was first published in my personal blog: Java 26: What's new? and is part of a serie on what’s new on the last versions of …
Gotta Code 'Em All: How Java Evolved Beyond Verbosity – Celebrating 30 Years of Pokémon
Happy 30th Anniversary to Pokémon! 🎉 February 27, 2026 marks exactly 30 years since the original Pokémon Red and Green launched in Japan on …
Project Panama for Newbies (Part 2)
In this part of the Panama series, the goal is to call C function signatures, often defined to accept pointers and structs, from Java.