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 answer …
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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 ме…
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 t…
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 mad…
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 c…
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 hours …
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 from …
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 f…
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 лишнее…
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 ( @OneToMany …
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 thanks…
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 a …
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 of …
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 bee…
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 avo…
«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 обращени…
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 = M…
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. 🚀 Introduc…