Skills across coding assistants
Claude Code reads skills from its own folders, while other assistants also scan .agents/skills. Where each one looks, and how symlinks fix …
Friends Of OpenJDK Today
Every article on foojay.io, newest first: OpenJDK, the JVM, Java tooling and the ecosystem around them, written by the Java community.
Jakarta EE Testing Tools Compared: WeldInitiator, Arquillian and Testcontainers
WeldInitiator, Arquillian, and Testcontainers answer three different questions about a Jakarta EE application. Here is what each one proves, …
Analytics in the Browser with DuckDB-Wasm and a Java Backend
A Java backend sends the dataset once and DuckDB-Wasm runs the SQL in the browser. A two-file example with no build tools, and when the …
Spring ApplicationContext Hierarchy and a High CVE in Axelix
How Spring's ApplicationContext hierarchy caused a JWT bypass in Axelix when Actuator ran on a separate management port.
Java 27: What’s New?
What's new in Java 27 for us, developers
EUDI wallets with OpenID4VP and pac4j: same device and another device
Authenticate Java Spring Boot users with EUDI wallets and pac4j: SD-JWT VC on the same phone, or an mdoc PID via QR code on another device.
Where Does The Experience Come From?
Proton’s CTO wrote a memo that nearly eulogized writing code by hand. Lars Faye points out that expertise comes from experience, and the …
Testcontainers Integration Testing: Running Your Real WAR in Docker
Learn how Testcontainers integration testing works for Jakarta EE: run your real WAR in Docker and test the deployed application from the …
Letting a Java AI Agent Request Cancellations with MySQL REST Service
Build a Java AI agent that requests order cancellations through MySQL REST Service, with scoped tools, ownership checks, and explicit human …
How I got a thread dump from a timed-out GitHub Actions test
When a JVM test hangs and GitHub Actions cancels the job, the test JVM is often still alive. Three ways to dump it, and an action that does …