@CacheEvict уходит раньше коммита, и кэш врёт до перезапуска
В Spring кэш и транзакции существуют рядом, но не знают друг о друге — из-за этого корректный на первый взгляд код может приводить к расхождениям ме…
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Retry policy на практике: подводные камни внедрения
Что делать, если произошла ошибка? Житейская мудрость говорит, что можно попробовать еще раз. В контексте разработки ПО существует известный и…
Week 13 of #100DaysOfCode: Completing Spring Microservices and Starting JUnit 5
Introduction This week was another challenging but rewarding part of my #100DaysOfCode journey. I started the week by learning about Docker and cont…
Spring Data JDBC: Укрощение Строптивого
Каждый Java разработчик в том или ином виде сталкивается с проблемой выбора инструментария для работы с БД. Если говорить про ORM-ы, то выбор у нас…
Week 12 of #100DaysOfCode: Exploring Spring Cloud and Microservices Infrastructure
Introduction This week was another challenging but rewarding part of my #100DaysOfCode journey. I continued going deeper into Microservices with Spr…
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…
Week 10 of #100DaysOfCode: Exploring Microservices and Modern Architecture
Introduction This has been one of the toughest weeks I've experienced since starting this challenge. There were moments when I doubted myself , ques…
Week 9 of #100DaysOfCode: A Week of Deep Spring Learning
Introduction This week, I decided to slow down and go deeper into the Spring Framework . Instead of focusing heavily on building new features, I spe…
DeepSeek Now Prices Tokens Like Electricity: 50% Off-Peak Discount and a Spring Boot Pattern to Profit From It
Three days ago I knew exactly what a DeepSeek call cost me. I had wired DeepSeek V4 Pro 0813 into a Spring Boot app with Spring AI, and the math was…
MCP Goes Stateless: Building AI Agent Servers with Spring AI 2.0
Last month, I was building an AI assistant for an e-commerce system. The idea was simple: let users ask natural-language questions about orders and…
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 answe…
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…
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…
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 m…
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…
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…
How does Spring Boot simplify the development of Java applications?
Introduction Imagine you're assembling a new piece of furniture. One option is to buy every screw, bolt, plank, and tool separately, then spend hour…
I Built a RAG App, Then Asked It What Car I Like. It Didn't Know.
TL;DR: Phase 1 of a from-scratch RAG app — Spring AI, pgvector, local Ollama — ends with a working pipeline and two failures that look identical fro…
Building an AI Chat Agent with MCP, Spring AI
Model Context Protocol (MCP) is an open standard for connecting AI apps to tools and data sources. A useful way to think about it is as a USB-C port…
Skill of the week: Spring Data JDBC — качество Opus на модели за копейки
Ранее в рубрике Skill of the Week мы уже разбирали Skill для Spring Data JPA . И, что предсказуемо, в комментариях нашлись те, кто увидел в нём лишн…
Один ко многим в Java: когда коллекция в родителе оправдана, а когда — нет
Реляционная модель хранит FK на стороне дочерней таблицы. В Java у нас два способа отразить эту связь: коллекция в родительской сущности ( @OneToMan…
OrderHub Day 2: Persisting Orders with JPA + PostgreSQL (Spring Boot)
OrderHub Day 1 stored orders in a HashMap — restart the server and they're gone. Day 2 fixes that: real persistence with JPA + PostgreSQL , and than…
The Version That Broke Everything
A deep dive into API versioning — what goes wrong without it, the old way developers survived it, and why Spring 7's new approach changes everything…
OAuth2 Login with JWT and Refresh Tokens in Spring Boot — The Setup You'll Rebuild Every Time
Most Spring Boot applications eventually need authentication. And many teams rebuild the same foundation every time. Add a login endpoint. Generate…
Stop Hiding SQL Behind Your ORM: jOOQ, JPA, and JDBC Under Production Load
Most persistence debates in Java are framed incorrectly. The question is not: Should we use JPA, jOOQ, or JDBC? The real question is: Is this part o…
Deep Dive into the Spring IoC Container: Unmasking BeanFactory and ApplicationContext
Why Every Spring Boot Developer Must Understand the IoC Container In the modern era of software development, abstracting away complexity has never b…
What is the Purpose of the @Autowired Annotation in Spring Boot?
Learn what the @Autowired annotation in Spring Boot is, how dependency injection works, practical examples, best practices, and common mistakes to a…
«Весомый» рефакторинг, или как мы перестали беспокоиться и полюбили работу с весами
Представьте, что вы работаете над кодом магазина, который живёт уже много лет. Бизнес доволен, продажи растут, но есть одна проблема — модуль обраще…
All You Need Is Lambdas: Java Tests Without a Mocking Framework
Most Java developers have written something like this. Maybe recently. @Test void should_categorize_new_transactions () { final var mockRepository =…
When Would You NOT Use Microservices?
Learn when NOT to use microservices in Java programming. Discover pitfalls, examples, and best practices to build smarter, simpler systems. 🚀 Introd…