AdMuse: Local AI for Promotional Content for Small Creative Businesses
This is a submission for the Hacktoberfest Open-Source AI Challenge Week 2: Side Hustle . What I Built Artists and small creative businesses often h…
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A Green Test Suite Can Still Hide a Broken PR: 5 Questions to Ask Before Merging
AI coding assistants can write implementation code and tests in minutes. The problem is that both can look correct while the behavior that matters r…
Easy Full Stack Authentication and Login in the Style of Spring
Three requests leave your app just as its access token expires. If each refreshes independently, the first exchange can invalidate the refresh token…
Android on iOS, Web & Desktop Efficiently and for Free
We are not the first to bring Android to iOS. Earlier projects brought Android's runtime along with the application. Dalvik was built for Android, i…
Building an Excel download API with TBEG and Spring Boot (Kotlin/Java)
In Part 3 , we explored TBEG's template syntax in depth. Now let's build an Excel download API with Spring Boot + TBEG - the most common real-world…
The Iceberg Table That Was Never Where We Wrote It
For the past week I've been working on Apache Hop , an open-source tool for building data pipelines. My goal was to let Hop read and write Apache Ic…
Spring Boot 3.5 Stopped Getting Patches in June. Don't Migrate to 4.0.
Two dates decide your next few weeks of Spring work: 30 June 2026 — Spring Boot 3.5 stopped getting free patches. 3.5.16 was the last one. 31 Decemb…
Building a Full RAG Pipeline in Spring Boot — From Ingest to Grounded Answer
Previous articles covered the individual pieces of RAG. You now know what embeddings are, how to chunk documents, and how Pinecone stores and search…
Four executable counterexamples from a component review repository
Disclosure: this article was generated by an AI agent from code it extracted, inspected and tested. AI agents also reviewed the extraction and repro…
Managing Cross-Functional Teams: A Practical Guide for Engineering Leaders
Cross-functional teams are where most modern software gets built. Product defines the problem, design shapes the experience, engineering builds the…
Оптимизация генерации ресурсов в Java, три Ryzen и 225 замеров
Почему ручное разбиение задач оказалось быстрее parallel().collect() в большинстве наших тестов. Привет, Хабр! Меня зовут Юрий, и уже десять лет я р…
Native Desktop Themes for Production Apps
A desktop app needs more than larger versions of its phone controls. Dialogs need their own windows. Title bars, scrollbars, and keyboard focus need…
Chunking — Why How You Split Documents Decides Retrieval Quality
The previous article explained how embeddings convert text into vectors so similar meanings land close together in vector space. Before you can embe…
Concurrency Programming (8): Read-Write Locks — From Language Rules to the CPU
Table of Contents 0. What Does This Article Answer Next? 1. What Does Java ReadWriteLock Guarantee at the Language Level? 1.1 Atomicity 1.2 Visibili…
Production-Ready Java REST Client: Retries, Pagination, Rate Limits, and Error Handling
Production-Ready Java REST Client: Retries, Pagination, Rate Limits, and Error Handling A simple REST client is easy to build. A production-ready RE…
SqlJam: Move Tables Across Databases with Schema, Data and All
Tables, indexes, constraints, sequences, partitions and rows, in one go. 1. Overview SqlJam : Move tables across databases. Schema, data and all. A…
Java 8 Streams vs Traditional Loops: Performance, Readability, and Lazy Evaluation
Introduction Since the introduction of Java 8, developers have faced a recurring architectural dilemma: should collections be processed using tradit…
Java Records and Sealed Classes: Designing Type-Safe Domain Models
Modern Java has undergone a significant renaissance. Long criticized for excessive boilerplate, verbosity, and the sheer amount of ceremony required…
The Database Tells You What Is. An Audit Trail Tells You What Happened
Something is wrong with a customer's account. You open the database and run: SELECT * FROM customer_account WHERE id = 12345 ; The row looks perfect…
Concurrency Programming (7): volatile — From Language Semantics to the CPU
Table of Contents 0. What Does This Article Answer Next? 1. What Guarantees Does Java volatile Provide at the Language Level? 1.1 Visibility and Ord…
Прощай, Кинопоиск
В октябре 2013 года яндекс выкупил КП. Для меня на тот момент это ничего не значило, ведь сервис остался прежним и продолжал работать. И перезапуск…
DSL в эпоху ИИ: делать или не делать…
Всем привет. Меня зовут Сергей и я руковожу разработкой автоматизации внутренних бизнес-процессов в рамках Центра управления процессами Московской Б…
Your IDs Were Equal Until They Passed 127
The check was one line. If the customer on the order is the customer on the session, let them see it. Two Long values, compared with a double equals…
You Might Not Need a Vector Database
A RAG pipeline is a lot of parts: a chunker, an embedding model, a vector database, a retriever, usually a reranker, and an eval harness to tell you…
If Your Spring AI Streams Die After 60 Seconds, It's Not Your Network
If you're on Spring AI 2.0.1 and your streaming calls die after about a minute with OpenAIIoException: Stream failed , stop debugging your proxy. Si…
Eliminating Race Conditions in Clustered Spring Boot with PostgreSQL Advisory Locks
It’s 02:14 AM. Your alert manager fires: an account balance dropped below zero, or a user received two trial credits instead of one. You trace the l…
I Removed an API Field. Hindsight Found Who Still Needed It.
API compatibility problems are rarely difficult because removing a field is technically hard. The difficult part is knowing who still depends on tha…
Building a Plugin (Microkernel) Architecture in Java
Ever been asked to add "just one more custom rule" to your application, only to watch your elegant logic turn into a massive, fragile switch stateme…
Concurrency Programming (4): Mutex Implementation — From Runtime to CPU
Table of Contents 0. What Does This Article Continue to Answer? 1. How Does HotSpot Implement synchronized? 1.1 Layers 1.2 The Complete Path of One…
Activating the AI Autopilot: How I Used Claude Code to Hunt Down a Complex JNI Memory Leak
Activating the AI Autopilot: How I Used Claude Code to Hunt Down a Complex JNI Memory Leak When executing an extended soak test on a high-throughput…