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 …
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Four Bugs Stood Between Me amd "Sign in with Google"
Summary: I had a rough time adding Google login to my app, Kenning. It took me a while to figure out four issues that were causing problems. These iss…
I Built a Tool That Shows the SQL Behind Any Spring Data Method Name
Spring Data JPA has one genuinely magical feature: you declare a query by naming a method . No SQL, no @Query , no implementation. interface OrderRepo…
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…
OrderHub Day 4: Bean Validation + Clean DTOs (Spring Boot)
OrderHub Day 4: never trust the client. Today the backend gets proper Bean Validation — bad requests are rejected at the edge with a clear 400, long b…
OrderHub Day 3: Versioned Schema With Flyway Migrations (Spring Boot)
OrderHub Day 2 let Hibernate create the schema with ddl-auto: update — fine for a demo, scary for a real team (unversioned, unreviewable, and it quiet…
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. …
Recap — M0 Foundations
This module built one thing, from many angles: the container — the part of Spring that creates your objects, wires them together, and hands them out. …
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 …
Craig Walls’ Spring AI in Action is out: 5-book giveaway + Spring AI discussion
Spring AI is the Spring project's response to the gap in solutions for integrating enterprise Java with generative artificial intelligence models like…
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…
Request Smuggling vs Request Splitting in Spring Boot
Request Smuggling vs Request Splitting Attack Difference Spring Boot Both attacks have CRLF in their DNA, both abuse HTTP parsing, and both can let an…
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…