Calendar API: Local Calendars, Cloud Sync, and Conflict Handling
PR #5413 adds com.codename1.calendar , a cross-platform API for local calendars and cloud providers. It covers events, tasks, recurrence, incremental …
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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…
Why Standard ERC-20 Fails for Real-World Asset (RWA) Tokenization (and How We Solved It with ERC-3643)
When building an Asset Tokenization Platform for Real-World Assets (RWA)—like fractional real estate, private equity, or yield-bearing bonds—the bigge…
TeaQL Java Runtime: Modular Refactor, Multi-Framework Ready, Rust-Aligned
We refactored the TeaQL Java runtime ( teaql-java ) to achieve three goals: JPMS module boundaries — seal internal packages, expose only what generate…
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…
Solon Validation: @Valid, 20+ Annotations, and Custom Validators Without the JSR 380 Baggage
I've been burned by JSR 380 enough times to appreciate a validation framework that doesn't drag in a whole ecosystem of dependencies. Solon's validati…
Spring AI Token Usage: Measure Cost Before You Pick a Model — LLM Cost Control 1/4
Cutting LLM costs in Spring AI starts with two choices: which model answers a request, and what defaults your ChatClient adds to every one it sends. N…
Spring AI vs LangChain4j: Which Java AI Framework Should You Choose in 2026?
Earlier this year, I needed to add an AI assistant to a Spring Boot application I maintain. Nothing exotic -- just a chat interface that could answer …
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…
Solon AOT & Native: Three Phases to a GraalVM Native Executable
When you hear "Java native compilation with GraalVM," you probably think of configuration hell — endless JSON metadata files, trial-and-error reflecti…
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…
Port Support You Can Trace Back to a Green Test
“Supported on iOS, Android, desktop, and web” sounds useful until you need one method on one target. Does WebSocket work on watchOS? Which Linux archi…
Избавляемся от потерянных событий в микросервисах — как я написал свой Spring Starter для Outbox/Inbox
Всем привет! Меня зовут Григорий, и недавно при разработке своего микросервисного приложения я нашёл уязвимость — сообщения, пересылаемые ме…
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…
Solon Cloud: The Distributed Toolkit That Doesn't Lock You In
When I first looked at Solon Cloud, I expected another opinionated microservice framework—the kind that tells you exactly which registry, which config…
From Java Monoliths to LangGraph Agents: What Transfers
I spent ten years building enterprise Java systems — a payments monolith broken into Spring Cloud microservices, banking applications, and currently a…
Anatomy of the Data Access Contract: Protect Your Domain from Framework Leaks (Chapter 3)
In almost every modern Java textbook, data persistence is introduced with a dangerous shortcut. You are told to create an interface, extend JpaReposit…
Nami RPC in Solon: Calling Remote Services Like Local Beans
The first time I wrote an RPC client in a Java project, I ended up with a hand-rolled HTTP wrapper, a pile of ObjectMapper calls, and a helper class n…
Stop Using Round-Robin: High-Throughput Java Virtual Thread Routing with P2C
Stop Using Round-Robin: High-Throughput Java Virtual Thread Routing with P2C Virtual threads allow Java microservices to comfortably run 50,000 concur…
Running Snyk on Real Legacy Java Code — The Full Unfiltered Results
Numbers are easy to skim. 10 Critical. 99 High. 59 Medium. 20 Low. 188 total. Those numbers appeared in the first article and they're striking — but t…
REST-style GraphQL — one line of Java handles filtering + sorting + pagination + stats + CSV export.
(Demo's in Chinese but you'll get the idea in 30 seconds) 👇 https://demo-bs.zhxu.cn/ A backend engineer's confession: you just wrote 100 lines of Java…
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…
Introducing Sheetmusic4J, a Java(FX) Library to Render and Interact with Sheet Music
I'm building MelodyMatrix with my son, an application to look at and play along with music. The app already shows a song in different views: falling b…
Explain the Concept of "Convention over Configuration" in Spring Boot
If you've ever started a Java project, you probably know how much configuration is usually required. You need to configure XML files, register beans, …
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 …
Why Package Structures Won't Save Your Spring Boot Architecture (And How Maven Enforces It) (Chapter 1)
How We Turned Architectural Guidelines Into Compilation Errors Have you ever found yourself doing a Friday afternoon Code Review, only to discover tha…
Part 5 - synchronized Keyword: Methods, Blocks, Thread Safety
In the previous article, we explored the native keyword and learned how Java communicates with C/C++ libraries using JNI. In this article, we'll learn…
Your Keycloak roles aren't working in Spring Security. Here's the actual reason.
If you've wired up a Spring Boot resource server behind Keycloak and your @PreAuthorize("hasRole('ADMIN')") is silently returning 403 for a user you c…
How We Beat HotSpot Performance (By Cheating, But Not Like That)
No, we didn't cheat in the benchmark. At least I hope we didn't. Every optimization in this story was gated on bit identical output checksums against …
Getting Out of the Password Business
Our old authentication system logged users in with the OAuth2 client_credentials grant. If you know OAuth, you just winced. client_credentials exists …