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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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 …
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…
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…
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…
Kotlin vs Java: что выбрать для бэкенда?
В статье рассмотрим кто сегодня выигрывает битву за бэкенд: сравнение синтаксиса, разбор производительности, а главное — честный прогноз на 2-3 года. …
Проектирование иерархии моделей данных в многослойном приложении
При проектировании многослойной архитектуры приложения одной из главных задач является формирование набора моделей данных каждого слоя и определение п…
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. …
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…
Circuit Breaker в микросервисах: как защитить систему от каскадных отказов
Представьте: сервис А звонит сервису Б, а тот зависает. Сервис А ждёт, занимает потоки, не освобождает ресурсы. Потом к нему приходит другой сервис — …
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…
The Orchestrator: State Transitions and Kafka Routing
In the previous post, I explained why I chose the Saga Pattern over distributed transactions. Now let's look at the central piece: the orchestrator. T…
Serverless applications on AWS with Lambda using Java 25, API Gateway and DynamoDB - Part 6 Using GraalVM Native Image
Introduction In part 1 , we introduced our sample application. In parts 2-5, we measured Lambda function performance using different approaches: witho…
Контрактное тестирование на Kotlin: гайд для автоматизатора
Интеграционные тесты зелёные, а после деплоя внезапно «пустые списки» и null в критичных полях — типичный сценарий для микросервисов. В этой статье ра…
I Inherited a 40,000-Line Java File. Here's What I Found Inside.
description: A developer's case study of inheriting and refactoring a 40,000-line Java Swing file in a production hospital system — without rewriting …
Cказ о том, как мы с Oracle на PostgreSQL переехали
Привет, Хабр! Меня зовут Даша Александрова, я Java‑разработчик. Хочу поделиться опытом миграции данных из Oracle в PostgreSQL без прост…
Rich domain modelling: a library story
Most software doesn't have a domain model. It has a database schema, a set of service classes that orchestrate calls to it, and a collection of user s…
Building Systems, Not Just Code
Strong fundamentals don’t just improve code—they shape how systems are built. Working deeply with Core Java sharpened my approach to problem-solving, …
Constructor in Java
A special method used to initialise objects. Constructor is a block of code similar to method Constructor is called when an object of a class is creat…
Java Without the JVM? A Journey into Spring Boot Native Images
The Cloud Bill That Didn’t Make Sense In the mid-2000s, Java was considered a heavyweight. A ravenous monster devouring all available hardware resourc…