Pi4J V5.0.0: Work in Progress
What is changing towards Pi4J V5.0.0: a big API cleanup, a simpler Context, parallel ports, RISC-V support, better board detection, and a new release flow.
foojay.io - Friends Of OpenJDK
Foojay is the vendor-neutral home for the Java community with daily news, OpenJDK data, podcasts and guides, made by the developers who use it. What is Foojay? →
Most recent post
Welcome to the new Foojay!
The same content from amazing Java developers, now in a new home. Foojay has been rebuilt from the ground up!
Cut Code Review Time & Bugs in Half. Instantly.
Supercharge your team to ship faster with the most advanced AI code reviews.
Get Started!Sponsored Content
Free eBook: Sustainability for Java Developers
Towards an understanding of sustainable software development, written by and for the friends of OpenJDK
Your GPU spend is optimized. Your JVM probably isn’t.
Hidden JVM inefficiencies - GC pauses, conservative JIT, slow warm-up - are quietly draining your AI infrastructure's performance and cloud spend. This guide shows how to eliminate that drag and scale with fewer nodes.
Download NowSponsored Content
A Smaller, Faster Java Server with a Spring-Style API
Build a smaller native Java service with Spring-style transactions and dependency injection. Inspect the generated code and compare local …
Apple Shouldn't Dictate Your App's Redesign Schedule
Adopt Xcode 27 without moving your redesign schedule. This week: Liquid Glass, a JPA inspired ORM, OpenTelemetry, WebSockets and push …
Build Your First SaaS with MongoDB Ephemeral Clusters
Provision a MongoDB Atlas Ephemeral Cluster with one API call, then have an AI coding agent build a full-stack Spring Boot and React job …
Lightweight Spring Boot Monitoring Without Prometheus and Grafana
Monitor Spring Boot applications on a small VPS using Actuator and StatLite, without operating a full Prometheus and Grafana stack.
Scraping websites and bot-protection
The levels of bot protection I met while scraping genealogy sites, from a bare curl to shell-launched Chrome, and how to get past each one.
One Embedding per Job, or Two? Measuring Semantic Search in a Spring Boot Job Portal
I stored two embeddings for every job in my Spring Boot job portal and measured which one finds the right jobs. One of them barely mattered, …
What I Learned Building an AI Code Reviewer with Java and Spring Boot
What I learned building an AI code-review workflow around GitHub Pull Requests, Spring Boot, and multiple AI providers.
What's New In The October 2026 Azul Payara Release?
Payara Community 7.2026.10 drops the elevated-permissions requirement for SSH nodes, and Azul Payara patches three security issues on every …
Introduction to Error Prone: How to Catch Bugs at Compile Time
Error Prone plugs into javac to catch code that compiles but is most likely wrong. A tour of its built-in checks, Refaster rules and custom …
Testing Jakarta EE: Three Layers, Three Tools
A guide to Simon Laden's three-part series on testing Jakarta EE with WeldInitiator, Arquillian and Testcontainers, and the question each …