Debugging Is Invariant Discovery: What One Kafka Session Taught Us About AI Agents
Every Java team has a sentence like this one somewhere: Any operation on a TID must go through the single asynchronous path and must not let …
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.
Community Spotlight: BoxLang Express Brings Node-Style HTTP to the JVM
If you've spent years in Spring Boot, Micronaut, or Jakarta EE, "web framework" usually means a servlet container, an embedded Tomcat or …
“Commit created” — but it isn’t: why the agent’s word needs external verification, and what the mistake costs
A detailed report reads like proof. The agent lists the files it touched, names the branch, quotes a commit hash, adds a test count and …
From OpenTelemetry to DuckDB
Observability platforms generally expect you to do your analysis inside them, using their query language and their dashboards. That works …
Featured Foojay Authors for September 2026: Marit van Dijk and Graeme Robinson
Our Featured Authors for September are Marit van Dijk and Graeme Robinson. Here is what they write about, and where to start reading.
Bringing Raspberry Pico to Quarkus with Firmata
Java applications are usually associated with APIs, databases, messaging systems, and cloud infrastructure. But Java can also interact with …
Build an AI Agent (From Scratch)
This review is about Build an AI Agent (From Scratch) by Jungjun Hur and Younghee Song from Manning. Facts 10 chapters $29.29 (at the time …
From Spec-Driven Development to Living Specifications in Java Projects
From Spec-Driven Development to Living Specifications in Java Projects Coding agents have changed the speed at which we can produce …
Building an Agentic Warehouse Management System — Part 3: Tools, Decisions, and Actions
In this third and final part, we will build on the execution plan created in Part 2 and focus on the remaining stages of the agent workflow. …
Building an Agentic Warehouse Management System — Part 2: Java and Spring AI
We will look at how the agent is built with Java and Spring AI, how its capabilities and boundaries are defined, how it is triggered by the …