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 …
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Every article on foojay.io, newest first: OpenJDK, the JVM, Java tooling and the ecosystem around them, written by the Java community.
Cristobal EscobarCommunity 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 …
Viktoria Evdokimova
70 views“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 …
Geertjan Wielenga
60 viewsFrom OpenTelemetry to DuckDB
Observability platforms generally expect you to do your analysis inside them, using their query language and their dashboards. That works …
Frank Delporte
63 viewsFeatured 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.
Igor De Souza
82 viewsBringing 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 …
Maximillian Arruda
3 viewsFrom 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 …
Ricardo Mello
106 viewsBuilding 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. …
Ricardo Mello
118 viewsBuilding 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 …
Ricardo Mello
156 viewsAgentic WMS — Part 1: Where AI Agents Add Value
With this project, I am not trying to build a complete WMS. Instead, I want to use a logistics scenario I know well to explore how an AI …