Building Long-Running Payment Workflows with Spring Boot and NERV Event
Building Long-Running Payment Workflows with Spring Boot and NERV Event Some payment operations finish in milliseconds. Others don't. Imagine a paym…
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Why I Built a Modern Spring Initializr Alternative with Visual JPA & Docker
Whenever I start a new Spring Boot project using standard tools like start.spring.io , the workflow usually looks like this: Select Spring Web, Spri…
One Missing WHERE Clause Can Expose Another Customer’s Data
A customer opens their dashboard and sees another company’s invoices. Nobody needed to break in. An endpoint returned data it should never have retu…
The Modular Layer JasperReports’ Powerful Engine Was Missing. Part 1: Where Jasper Came From and Why It Lacked Modularity
Researching such big and complex products as JasperReports, and even more building your own practical tool for it, is clearly not a trend of 2026. T…
Transactional Outbox Pattern: Memory Queue for Speed, PostgreSQL for Recovery
In distributed systems, the Transactional Outbox Pattern is a common way to reliably publish events after a database transaction. The idea is simple…
Nexus Core v1.7.0: Moving from MongoDB-Centric to Multi-Database Architecture
Nexus Core v1.7.0: Moving from MongoDB-Centric to Multi-Database Architecture Today I released Nexus Core v1.7.0 , and this is one of the most impor…
Your Spring AI tests are slow, flaky, and cost money. Here's how to make them deterministic.
You wire up Spring AI, the ChatClient fluent API feels great, your feature works. Then you sit down to write a test — and every good option is bad.…
I Built a Self-Hosted AI Support Widget with Spring Boot (No Monthly SaaS Fees)
Every new SaaS seems to embed ChatGPT these days. Most AI support solutions rely on third-party platforms, monthly subscriptions, and vendor lock-in…
Building a Multi-Agent Hiring Workflow with LangChain4j and LangGraph4j on Spring Boot
I wanted to actually learn LangChain4j and LangGraph4j beyond the "hello world" chat example, so I built something with enough moving parts to force…
I built a "real job" simulator for Spring Boot learners, free & open source
Most Spring Boot tutorials teach you to build a CRUD app and call it a day. But that's not really what the job looks like day to day, so I put toget…
Mapping Strategies Without the Magic (Chapter 4)
At the end of the previous chapter, I teased that we were about to dive straight into the heavy machinery of DAO implementation - hooking up Spring…
Spring Batch DB Cluster Partitioning 3.0.0 — distributed partitioning with just a database, now on Spring Boot 4 & Java 21
spring-batch-db-cluster-core 3.0.0 is live on Maven Central. This is the biggest release of the project so far — a full platform upgrade plus a batc…
How I Built JWT Authentication in Spring Boot (Beginner-Friendly Guide)
How I Built JWT Authentication in Spring Boot (Beginner-Friendly Guide) Authentication is one of the first things every backend developer learns whe…
Service-to-Service Communication in Microservices: What Every Developer Should Know
I still remember the first time a junior dev I was mentoring asked me, "why did the order service just... hang for 30 seconds and then crash the who…
Adding Voice to a Java AI Assistant — Whisper, TTS, and the Voice Conversation Loop
How we gave Jarvis the ability to hear and speak — Phase 5 of the Jarvis AI Platform Where We Left Off After Phase 4 , Jarvis could answer questions…
Stop Rebuilding Exception Handling in Every Spring Boot Project
After working on multiple Spring Boot projects over the years, I noticed an interesting pattern. Every application had different business requiremen…
MapStruct vs Immuto: Where the Records Gap Actually Is
A follow-up to Java Records deserve a mapper My earlier post introduced Immuto and made the general case for a mapper designed around Records from d…
Show Dev: Self-reinforcing K-pop data pipeline using Spring Boot and pgvector (Built on OCI Free Tier)
Hi everyone, I'm a backend developer based in Seoul. I built k-cosmos, an interactive web-based 3D music space that maps K-pop tracks based on 768-d…
Sprout: a Spring-style, Spring-compatible framework for building AI tooling in Java
Your backend already exists. It runs on the JVM, it has services, configuration and tests, and increasingly it needs to do AI things — call a model,…
Spring AI: The Senior Dev's Honest Take on Java's AI Moment
TL;DR Spring AI is an official Spring project that integrates AI models into Java using familiar patterns: auto-configuration, dependency injection,…
MCP Java SDK – Build Model Context Protocol servers in Java
Hi HN, I built an open-source Java SDK for building Model Context Protocol servers: https://github.com/6000fish/mcp-java It is intended for Java dev…
Securing Your Spring Boot Architecture: A Pragmatic Approach with Clprolf
Introduction Spring Boot is an incredible framework. It gives developers immense freedom to build and scale applications quickly. However, in large…
Deploying Spring Boot to AWS EC2 with Docker and GitHub Actions — The Repeatable Way
Deploying a Spring Boot application to AWS EC2 is straightforward once you've done it. Getting there the first time — and repeating the setup on you…
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…
Built an AI-Powered Spring Boot Log Analyzer Using RAG + Ollama
I've been working on a log analysis platform that helps debug Spring Boot applications by analyzing logs and stack traces using RAG. https://loganal…
Navigating the AI world order as a Java Dev - 1.0.0
(Inserts background music. Into the Spider-Verse: Only one Spiderman, theme in Spotify) Alright, let's do this one more time! This is Abhishek, and…
The Zero-Drift API Series: Stop Trusting a Green Build You Can't Explain
The Zero-Drift API Series Stop Trusting a Green Build You Can't Explain There is a specific kind of production incident that hurts more than the oth…
Why Java + Spring Boot is Still the King of Enterprise Backend (2026)
Why Java + Spring Boot is Still the King of Enterprise Backend (2026) After 13 years building enterprise systems across PayPal, Salesforce, and NCR,…
Idempotency4j - Java/Spring Boot idempotency library
The last couple of months, I ended up implementing idempotency in 2 different Spring Boot projects back to back. As I was implementing it in the sec…
When Your Full-Stack Framework Gets Deprecated — Planning an OSS Migration from Hilla
The Bad News Every developer dreads the moment: the framework you built your application on is being discontinued. That's exactly what happened to u…