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I Built an AI Meeting Summarizer with Spring AI — Here's How (and Why)

🚀 The Problem Wait, what did we decide in that meeting? We've all been there. You have a productive meeting, everyone agrees on action items, and by…

What may degrade, and what must fail fast

Six services sit between a buyer clicking "buy" and a vendor eventually getting paid: auth , gateway , catalog , inventory , order , and now settlem…

🚀 Spring Boot Learning Series — Episode 3 | Spring Boot

Episode 3 | Spring Boot | Auto-Configuration, Starters & How the Application Starts Episode 1 covered why Spring exists — avoiding tight couplin…

No, the LLM Doesn't Get to Approve Your Refund

ADR 001: why refund eligibility is deterministic Java, not a model judgment Part 3 of an ongoing experiment: building an LLM-powered support agent w…

Making HTTP Fail on Purpose: Building a Small Chaos Library for Java - Flaky HTTP

I recently built and open-sourced Flaky HTTP , a small Java 11 library for deliberately making HTTP calls less reliable. That may sound like an unus…

Four Java Bugs That Bad Indentation Hides in Plain Sight

javac does not care what your code looks like. Whitespace carries zero meaning in the Java Language Specification, so the compiler reads your file a…

Building Cross-Framework Messaging with Quarkus, Micronaut, and RabbitMQ

The JVM ecosystem offers a wide range of powerful frameworks, each with its own strengths and capabilities. In a modern distributed architecture, ho…

Migrating from Java to JavaScript/TypeScript? Here's how to map your stack

Moving services from Java (Spring Boot) to Node.js / TypeScript is a common transition when engineering teams want faster iteration speeds, unified…

[Перевод] Две аннотации Hibernate, которые вдвое сократили время обработки JSON

Всем привет! На связи Михаил Поливаха, технический лидер проекта Axelix . На известном в узких кругах блоге Hibernate (он же in-relation-to) пару ме…

AOP: aspect / pointcut / advice / weaving

Every codebase grows a set of chores that have nothing to do with the actual job of a method, yet somehow end up inside every method anyway. Logging…

Why You Should Avoid @Data on JPA Entities

Lombok isn't necessarily the problem. Not understanding what it generates is. Under the hood, @Data is essentially a combination of several Lombok a…

A 5ms Blocking Call Took My Service From 17,189 to 549 req/s

A 5 millisecond blocking call. Nobody would call that slow. It passes code review and looks fine in a trace. On a Tomcat worker thread, my service d…

Почему ML-модель получает неправильные признаки: Event Time, Watermarks и Apache Flink

Представьте: вы разрабатываете антифрод-систему для банка. Пользователь совершает пять покупок подряд за пару минут. Все транзакции успешно попадают…

Writing QUIC in Pure Java

I maintain gumdrop , an async, non-blocking Java server framework. Last year I wanted to add HTTP/3 support, and ran into a wall: the Java ecosystem…

What I gave up to run Spring static analysis in a browser

There is a question that costs me half an hour every time I have to answer it: If I change this controller method, what else breaks? The honest proc…

Из Java во Flutter: я написала мобильное MVP и вот что поняла

Всем привет! Меня зовут Милена, я бэкенд‑инженер на Java в Банки.ру. Полтора года назад я вызвалась написать мобильное приложение для&nbsp…

Redis — история одного падения

Пару лет назад мы устроили настоящее расследование серии инцидентов в поисках скрытого дефекта нашего Redis-клиента. Команда воспроизводила сбои под…

What is IoC and DI (Dependency injection)??

before we talk about IOC (Inversion of control) and DI (dependency injection) i will firstly explain why it is used. so basically when we create dif…

Two-Layer Idempotency: Why Not Every Settlement System Needs an Outbox

A few weeks ago I published a write-up on inverting the control flow of a settlement API: instead of the endpoint owning window semantics (batching,…

An Agent on a Leash, or why my AI agent doesn't make business decisions

This post kicks off an ongoing experiment: building an LLM-powered support agent you can actually trust, one decision at a time. Everything describe…

Свежий взгляд на бронирование тайм‑слотов, или как я это сделал на Spring boot, используя пессимистические блокировки

Здравствуйте, Хабровчане! Меня зовут Дмитрий, я бэкенд разработчик Java. Недавно я наткнулся на задачу, которая сначала показалась мне копеечной, а…

Разработчики в вашей компании уже тратят много токенов. Как проверить реальную пользу ИИ для бизнеса?

За час ИИ-агент может изменить десятки файлов, написать тесты и потратить большой объём токенов. Польза для команды зависит от результата. Если разр…

Spring AI Retries and Embeddings: Failed Answers and Full Re-indexes — LLM Cost Control 4/4

Across the first three parts of this series, the goal has stayed the same: send fewer tokens without losing what the model actually needs to answer…

Hey, I'm new here! Documenting my Java, Spring Boot & Applied AI learning journey 👋

Hi everyone! I'm excited to join the DEV community. What I'm doing: I'm learning Java and Spring Boot, and also picking up AI/Machine Learning funda…

AI-native Tiny Teams — правильный вектор или хайп 2026 года?

В 2026 году из каждого утюга звучит тезис: несколько сильных инженеров с агентами теперь способны делать работу, для которой раньше требовалась полн…

I Found a P0 Auth Bypass by Testing What null Does to BCrypt

While building SCIP — a supply chain platform with 90+ Spring Boot REST endpoints — I was boundary-testing the auth flow when I noticed something th…

Stop Killing Your Database with @Transactional in Spring Boot

The 1-minute fix that slashed my API response time by 40%. We all know @Transactional makes database work easy. But are you using it correctly? Here…

How To Report A Bug So It Actually Gets Fixed

Dropwizard: A Practical Java Framework for Building RESTful Web Services (2026-08-23 14:20)

Dropwizard: A Practical Java Framework for Building RESTful Web Services When you need to build a production-ready RESTful web service in Java witho…

Preview the November 2026 AWS SDK for Java retry defaults on your own traffic

If you run a Java app that talks to AWS, there's a change coming on November 1, 2026 that will quietly alter how your services behave under partial…