Secure Your APIs: OAuth2 and JWT for Beginners
Secure Your APIs: OAuth2 and JWT for Beginners APIs are frequent targets for bad actors since they expose data and functionality. Securing them whil…
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Spring Batch parallel processing and partitioning tutorial — Complete Guide
Spring Batch parallel processing and partitioning tutorial — Complete Guide A practical, in‑depth guide to Spring Batch parallel processing and part…
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…
Role-Based and Permission-Based Access Control in Spring Security
Introduction Once authentication is solid, the next question is inevitable: what is this user actually allowed to do? Authentication proves who you…
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…
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…
MindCare: A Real-World Angular + Spring Boot Project You Can Actually Run and Explore
If you're learning Angular, Spring Boot, or full-stack development, you've probably faced this problem: You can find hundreds of tutorials , but fin…
Openspreader: The missing piece of Java concurrency. `java.util.concurrent`, scoped to the cluster.
Thirteen coordination primitives as one Spring Boot starter. The APIs you already know, spanning every instance of your application instead of one J…
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…
The Silent Killer in Spring Boot: Why @Transactional Around Third-Party APIs Exhausts Your Connection Pool
It’s 03:00 PM on a Tuesday. Your monitoring dashboards go red. Incoming requests are timing out, HTTP 504 errors are spiking, and users are reportin…
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 Production-Ready Persistence Layer in Spring Boot
Spring Data JPA makes persistence remarkably easy to start with. Create an entity. Extend JpaRepository . Start writing business logic. public inter…
I Missed @Service in Node.js, So I Built It with Express
Let the browser console create the files At first, the browser console was only a debugging tool. I wrote the same create, read, update, and delete…
Stop Chasing Exactly-Once. Your Kafka Consumer Just Needs to Not Care
Every few months a team I talk to decides they need exactly-once delivery in Kafka. They read the docs, discover processing.guarantee=exactly_once_v…
Model Context Protocol with Spring AI, Building MCP Clients and Servers in Java
Model Context Protocol with Spring AI: Building MCP Clients and Servers in Java In the previous article, we explored how to build AI agents with Spr…
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…
The Inbox Transaction Boundary: Getting Event Processing Right in Spring Boot
The Inbox Transaction Boundary: Getting Event Processing Right in Spring Boot One of the hardest parts of building an event-driven system isn't gett…
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…
The /actuator/env Sanitizer Doesn't Know Your Naming Conventions
I recently wrote about allowlisting actuator endpoints : what to expose and what not to. One question stayed open and kept nagging at me: if you dec…
Reliable Event-Driven Architecture in Spring Boot: Outbox, Inbox, Retries, and Idempotency
Event-driven architecture looks simple at first. Your application performs a business operation, publishes an event to Kafka or SQS, and another ser…
Beyond Heavy API Keys: How I Built a Zero-Cost Asynchronous AI Summarizer in Spring Boot 3.4
🚀 Introduction When building cloud services around Generative AI, developers often face two major challenges: High Latency & Thread Exhaustion:…
Week 11 of #100DaysOfCode: Learning and Building Microservices with Spring Boot
Introduction This week has been another challenging but rewarding part of my #100DaysOfCode journey. I moved from learning Microservices Architectur…
🚀 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…
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…
Building a Full Enterprise-Ready React + Spring Boot Auth Flow: An End-to-End Guide
Introduction Authentication is one of those things that looks simple in a tutorial and becomes surprisingly complex in production. Between token sto…
What Every Java SaaS Backend Keeps Rebuilding — and How to Structure It Once
Starting a new SaaS product is exciting until you realize how much work happens before you can build the feature that actually makes the product uni…
Run Local LLMs with Ollama and Spring AI
In the previous parts, we connected Spring AI with cloud-based AI models. But there is one important question: What if you don't want to send your d…