Rollback Chains: When Payment Fails, What Actually Happens
Rollback Chains: When Payment Fails, What Actually Happens In the previous post, I showed the orchestrator's state transition table. It knows which to…
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Новый дачный сезон с Java, управлением сервера без интернета и AI моделью
Всем привет! Меня зовут Александр, это моя первая статья, хочу поделиться с вами историей создания программно-аппаратного open source решения для подд…
I Rebuilt the Core of My Data Engine — Here's What Changed in v1.3.0
I Rebuilt the Core of My Data Engine — Here's What Changed in v1.3.0 What is Nexus Core? Nexus Core is a standalone Java application — a central data …
Spyfcc: Monitor Your API Traffic with Ease
Hello Spring Boot developer; I developed this tool to easily monitor incoming and outgoing API traffic. My goal was to enable faster debugging by maki…
SDD на масштабе FullStack-приложения: 17 спринтов, две конституции, три чата
В первой статье я писал про SDD на примере одного вечера. После чего прошёл 17 спринтов SDD на FullStack-приложении: B2C-трекер привычек и целей, два …
Mastering Concurrency: Why Thread Pooling Is Critical for High-Performance Java Applications
Discover why Thread Pooling is essential for high-performance Java applications. Learn how to optimize your Java programming with modern, practical ex…
Java Map internals: a complete guide for juniors
Table of contents Why does Map exist? What would life be without it? HashMap: the street analogy hashCode() and equals() explained Collisions: when tw…
The Heart of B3: Building the Matching Engine with RabbitMQ, Redis and Spring Boot
Hello everyone! Continuing the My Broker B3 series, we've reached one of the most anticipated components of the ecosystem: the B3 Matching Engine API …
Syncing the Real Market: Consuming Brapi and Feeding Redis with Spring Boot
Hello everyone! Continuing the My Broker B3 series, today we'll talk about an essential component on the B3 side of our simulator: the B3 Market Sync …
I wrote my third XML parser. Here's why this one was different.
Hi, I'm Pasha, and I write XML parsers. Not because the world needs another one. The world has xmlutil by Paul de Vrieze, which I will say specific ni…
My Developer Profile
About Me I took the plunge into the IT industry in May 2023. In my career so far, I’ve had many opportunities to work with Java and JavaScript (TypeSc…
How I Rebuilt a Three-Layer Cache System in Java — Redis, L1, and MongoDB Done Right
I've been working on Nexus , a backend infrastructure project, and recently hit a point where the data synchronization layer needed a serious rethink.…
A Background Job Was Crashing Our JVM Every Week - Until We Taught It to Stop
Some Java services don't fail because of traffic. They fail because background jobs don't know when to stop. A background job should never be able to …
LockFS - A simple flexible file-by-file encryption tool for secure storage
Pain Points of Current Encryption Tools Most encryption tools today encrypt your data with a monolithic approach. Here are some of the methods you wil…
I got tired of heavyweight frameworks, so I built my own web server in Java
I got tired of heavyweight frameworks, so I built my own web server in Java Most Java web projects start with Spring Boot. You add the dependency, and…
RestTemplate vs RestClient vs WebClient
The HTTP Client Showdown Every Spring Developer Needs to Understand If you've been writing Spring applications for a while, you've probably had this c…
Adding IOC, FOK, and Stop Orders to a Matching Engine
A matching engine that only supports limit and market orders is a toy. Real exchanges need orders that expire, orders that demand all-or-nothing execu…
Claude 3.7 + JEP 480: Stop Building Fragile AI Agents with CompletableFuture
Claude 3.7 + JEP 480: Stop Building Fragile AI Agents with CompletableFuture Claude 3.7 just dropped with superior reasoning and "Computer Use" capabi…
Your Virtual Threads Are Leaking: Why ScopedValue is the Only Way Forward
Your Virtual Threads Are Leaking: Why ScopedValue is the Only Way Forward. If you're spinning up millions of Virtual Threads but still clinging to Thr…
Java LLD: Designing a Kafka-Like Message Queue for Machine Coding Interviews
Java LLD: Designing a Kafka-Like Message Queue for Machine Coding Interviews Designing a high-performance message queue is a frequent requirement in s…
Making illegal state unrepresentable
A couple of years ago, I wrote that The Builder pattern is a finite state machine! . A state machine consists of states and transitions between them. …
The REST Assured Setup Nobody Shows You: Handling Auth Tokens That Expire Mid-Suite
Most REST Assured tutorials show you a single given().when().then() against a sample API and call it done. That's fine for learning the syntax, but it…
Нагрузочное тестирование с Apache JMeter: Best Practices
Apache JMeter — не просто инструмент. В этой статье разберем, как получать от него реальную пользу. Вы узнаете, почему 80% отчётов о нагрузке бесполез…
What is MCP and Why Java Developers Should Care
What is MCP and Why Java Developers Should Care Every AI tutorial shows you how to build a chatbot. You give it a system prompt, connect it to an LLM,…
Zero-Code-Change Stacktrace Filtering for Spring Boot: An Infrastructure-Level Integration
This article is intended for software architects, senior backend engineers, and platform engineers working on commercial Java systems where stacktrace…
Agent Memory with LangChain4j and Oracle AI Database
One of the quickest ways to make an impressive agent demo is to prepare a clever prompt. One of the quickest ways to make that same agent fall apart i…
Bringing Java Closer to Education: A Community-Driven Initiative
Story Horse? Java has long been one of the most powerful, stable, and widely-used programming languages in the world. Yet when it comes to education, …
What Being at JCON Europe Teaches Me (Beyond the Talks)
I’m writing this from JCON Europe 2026, in Cologne, Germany, right in the middle of one of those rare environments where everything revolves around bu…
Как упаковать React и три Java-сервиса в один .exe с помощью Electron и ничего не сломать
Всем привет! Меня зовут Евгений Оселедец, я ведущий разработчик в компании Axenix. В этой статье расскажу, как мы упаковали React и Java в единое авто…
Hello DEV! I'm Nouman — CyberSecurity Student & Fullstack Developer from Pakistan 🇵🇰
## Hey DEV Community! 👋 My name is **Nouman** and I'm a **CyberSecurity & Digital Forensics student** and **Fullstack Developer** from Pakistan. #…