Mapping Strategies Without the Magic (Chapter 4)
At the end of the previous chapter, I teased that we were about to dive straight into the heavy machinery of DAO implementation - hooking up Spring Da…
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Sole developer on a national SSO platform for six months, with Claude writing most of the code
Solution architect, 17 years in. From roughly March 2026 to July 2026 I was the only hands-on developer on the identity and single-sign-on layer for a…
Spring AI: Bringing Generative AI into Spring Boot Applications
Artificial Intelligence has moved from being something handled by specialized data-science teams to becoming a feature that application developers can…
Important Design Patterns in a Nutshell
When building complex software systems, writing code that simply "works" is not enough. As systems scale and requirements evolve, poorly structured ob…
The Lateral Isolation Tax: Preventing Direct Communication Between Peer Services
I put together a project to document an architectural discipline I call " Lateral Isolation ". The core idea is simple: preventing direct communicatio…
Building Local AI Agents in Java with Tools4AI and Ollama: An Insurance Claims Use Case
Tools4AI is a 100% Java agentic AI framework that turns any annotated Java method into an AI-callable action. Ollama runs open models like Llama 3.1 a…
Spring Batch DB Cluster Partitioning 3.0.0 — distributed partitioning with just a database, now on Spring Boot 4 & Java 21
spring-batch-db-cluster-core 3.0.0 is live on Maven Central. This is the biggest release of the project so far — a full platform upgrade plus a batch …
Stop hand-juggling JAVA_HOME: automatic per-project JDK switching with Jolta
If you work on more than one Java codebase, you've probably lived this: one service targets JDK 17, another needs 21, and there's a legacy app that wi…
Rod Johnson Is Back - and He's Bringing AI Agents to Java
If you have written enterprise Java in the last 20 years, you know the name Rod Johnson. He created Spring Framework back in 2003 - the thing that mad…
How I Built JWT Authentication in Spring Boot (Beginner-Friendly Guide)
How I Built JWT Authentication in Spring Boot (Beginner-Friendly Guide) Authentication is one of the first things every backend developer learns when …
Testing Keycloak SPIs with Testcontainers — the part every tutorial skips
Most "here's how to write a custom Keycloak authenticator" posts end at mvn package . You get a class that implements Authenticator , a factory, a MET…
Why WHOIS is Deprecating and How to Use RDAP in Java
The Problem with WHOIS For decades, the WHOIS protocol was the go-to solution to check domain ownership, IP address allocations, and Autonomous System…
Stop Guessing JVM Bugs: Connect Claude Code to Spring Boot via Local MCP Actuator Servers
Stop Guessing JVM Bugs: Connect Claude Code to Spring Boot via Local MCP Actuator Servers In 2026, if you are still manually digging through heap dump…
TrulyFreeOCR – a Java OCR pipeline in a single fat JAR, zero native deps required
Introduction I'm the author of TrulyFreeOCR, an open-source OCR pipeline that turns scanned PDFs into searchable, highly-compressed PDFs. Everything i…
Modernising a legacy AS/400 (IBM i) system without rewriting it
Many companies still run production, warehousing, orders and invoicing on a business system that has been going for twenty years or more on an AS/400.…
The JDK's forgotten JMX protocol
Every Java engineer who has connected JConsole — or JDK Mission Control — to a server in another network segment knows the ritual. Open the JMX port. …
More Surfaces, Same Deal: Cars, Sensors, Commerce, Video And Builds
Last week's release post was about funding open source without the bait and switch. This week's release tests that idea again, because two of the new …
Functional Programming in Java: A Complete Guide to Lambdas and Streams
🚀 Just published a new article! Functional Programming in Java: A Deep Dive into Lambdas and Streams If you've ever used Java Streams or lambda expres…
Adding Voice to a Java AI Assistant — Whisper, TTS, and the Voice Conversation Loop
How we gave Jarvis the ability to hear and speak — Phase 5 of the Jarvis AI Platform Where We Left Off After Phase 4 , Jarvis could answer questions u…
Stop Rebuilding Exception Handling in Every Spring Boot Project
After working on multiple Spring Boot projects over the years, I noticed an interesting pattern. Every application had different business requirements…
MapStruct vs Immuto: Where the Records Gap Actually Is
A follow-up to Java Records deserve a mapper My earlier post introduced Immuto and made the general case for a mapper designed around Records from day…
Show Dev: Self-reinforcing K-pop data pipeline using Spring Boot and pgvector (Built on OCI Free Tier)
Hi everyone, I'm a backend developer based in Seoul. I built k-cosmos, an interactive web-based 3D music space that maps K-pop tracks based on 768-dim…
Native Linux, Apple Watch, A Game Builder And Crash Protection
This week brings a native Linux desktop port, an Apple Watch and Wear OS port, a visual Game Builder with a high-level gaming API, and a new crash-pro…
Sprout: a Spring-style, Spring-compatible framework for building AI tooling in Java
Your backend already exists. It runs on the JVM, it has services, configuration and tests, and increasingly it needs to do AI things — call a model, e…
Почему сейчас стажеры и джуны знают больше, но пишут код гораздо хуже, чем раньше
Всем привет, меня зовут Михаил, я работаю senior Java/Kotlin разработчиком в ОТП Банке. В свободное от работы время я занимаюсь менторством. Ко мне пр…
Spring AI: The Senior Dev's Honest Take on Java's AI Moment
TL;DR Spring AI is an official Spring project that integrates AI models into Java using familiar patterns: auto-configuration, dependency injection, a…
"Confluence Docs Lie. Tie Your Documentation to Code Instead."
Every team has that Confluence page. The one that was carefully written to explain what the service does, what the API looks like, what each DB column…
MCP Java SDK – Build Model Context Protocol servers in Java
Hi HN, I built an open-source Java SDK for building Model Context Protocol servers: https://github.com/6000fish/mcp-java It is intended for Java devel…
Securing Your Spring Boot Architecture: A Pragmatic Approach with Clprolf
Introduction Spring Boot is an incredible framework. It gives developers immense freedom to build and scale applications quickly. However, in large te…
Stop Hiding SQL Behind Your ORM: jOOQ, JPA, and JDBC Under Production Load
Most persistence debates in Java are framed incorrectly. The question is not: Should we use JPA, jOOQ, or JDBC? The real question is: Is this part of …