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 …
Week in review: 7 September 2026
New authors
Welcome to Dmitry Moskalyuk, who published a first article on foojay.io this week.
Published this week
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 …
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.
From OpenTelemetry to DuckDB
Observability platforms generally expect you to do your analysis inside them, using their query language and their dashboards. That works …
“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 …
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 …
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 …
Masking a JVM thread dump without breaking the analysis
A few weeks ago I posted on r/java about detecting virtual thread pinning from a plain thread dump. The technical discussion was fine. The …
One Base URL, Many Coding Agents: What an OpenAI-Compatible Gateway Looks Like From java.net.http
Somewhere in every coding agent there is an HTTP client. Claude Code, Codex, Cursor, Cline, OpenCode: strip away the terminal UI or the …
Reflection-Free Serialization on the JVM: Four Formats In, Avro Out
I run a model layer that accepts the same business data in JSON, XML, YAML, and TOML and converts it all to Avro. The project was …
Come for Java. Get a Whole Lot More.
JCON USA returns inside IBM TechXchange 2026 with two rooms of deep Java content, a dedicated community home, and direct access to one of …