Programming Isn’t About Syntax: It’s About Understanding the Basics
I’ve been thinking about why programming feels harder than it should when you’re starting out. I think a big part of it is how it’s taught. You jump s…
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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…
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 …
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…
Мониторинг температуры и влажности в квартире на минималках
Данная статья является продолжением статьи https://habr.com/ru/articles/871380/ про сенсор HT2000, который измеряет CO₂, температуру и влажность. В ра…
A Tiny Retry Utility That Saves You From Random Failures
Sometimes the difference between a flaky system and a reliable one is just a few lines of retry logic. Network calls fail, APIs timeout, and transient…
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…
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…
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…
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. #…
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…
What Happens Between @SqsListener and Your Method in Spring Cloud AWS SQS
Originally published at tomazfernandes.dev . You write a method, add @SqsListener , and messages start arriving. It is easy to see that as a simple an…
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…