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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…

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…

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…

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…

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…

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…

Why a 99% Cache Hit Rate Is 10x Faster Than 90% (Not 9%)

I ran the same query 10,000 times: almost 2 seconds of database work for an answer that never changed. The database did not fail. I just kept asking…

'u' Replaced By 'U' Is A Big Error,Insight From My On Going Spring Boot Project

For Three days I was struck on running my Cart endpoints.Everything seems correct. But the Error on running the endpoint was : { "success" : false ,…

App Hardening: One Obfuscation Pipeline Across Every Port

Obfuscating only the Android artifact is a poor security model for a cross-platform application. Codename One App Hardening transforms the merged ap…

A 9.8 Critical CVE That Never Existed: How to Filter Fake Vulnerabilities Out of Your Java Pipeline

On July 30, 2026, JFrog's security team published something that should worry anyone whose build pipeline opens tickets automatically from a vulnera…

GitHub's Copilot SDK for Java: What Running Agents in Spring Boot Without Frameworks Reveals About Tool Integration

Every Java team adding AI to a backend right now faces the same fork in the road. If you are on Spring Boot, you reach for Spring AI. If you are not…

@StandardException

I recently came across a little gem annotation from Lombok that I had never heard of before: @StandardException . You can annotate your Exception cl…

How to Configure Full Parallel Execution in TestNG via Maven (with Dynamic Thread Control)

Running automation test suites sequentially can quickly become a bottleneck in CI/CD pipelines. To optimize execution efficiency, you can enable ful…