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The Java ecosystem has evolved more in the last 3 years than in the previous 10. If you are still writing verbose “Java 8” style code with cluttered getters/setters and manual thread management, you are working harder than necessary.
This section is a dedicated migration path for the modern enterprise developer. We cover the shift to Java 21 (LTS) and the Spring Boot 3 stable. Key topics include:
TL;DR: The Executive Summary If you only have 30 seconds, here is why your CI pipeline is red: The Villain: Thread.sleep(5000). It makes tests slow (wasted time) and flaky (fails if the server takes 5.1s). The Hero: Awaitility. It polls your code: “Are we done? No. Are we done? No. Are we done? Yes!” The…
Read More “Testing Asynchronous Flows with Awaitility: The End of Flaky Tests” »
TL;DR: The Migration Blueprint Short on time? Here is the 30-second summary of the upgrade path: The Hurdle: The biggest pain point is the javax.* to jakarta.* rename (Java 17 blocker). The Tool: Do NOT manually find/replace. Use OpenRewrite scripts. The Reward: Virtual Threads (Project Loom) allow you to ditch reactive complexity (WebFlux) for simple…
Read More “Migrating from Java 8/11 to Java 25: The Refactoring Checklist (2026 Edition)” »
Spring Boot Global Exception Handling The “Spaghetti Catch” Anti-Pattern If I review a Junior Developer’s code and see a try-catch block inside a @RestController, I immediately request changes. Why? Because mixing business logic with error handling logic is the fastest way to create unmaintainable “Spaghetti Code.” In 2026, your controllers should be “Happy Paths” only….
Introduction: The “Category Error” of 2026 If you are a Senior Architect or Lead Developer designing systems in 2026, asking “Spring MVC vs. Spring Boot” is akin to asking “Engine vs. Car.” It is a category error that betrays a misunderstanding of the modern Java ecosystem. Ten years ago, this comparison made sense. You chose…
Read More “Spring MVC vs. Spring Boot in 2026: The Senior Architect’s Definitive Guide” »
The Hangover After the Reactive Party If you are reading this in 2026, you likely have a love-hate relationship with Spring WebFlux. Five years ago, we adopted Reactive programming for one reason: Scalability. We needed to handle 10k+ concurrent requests, and the traditional thread-per-request model (one OS thread per user) was hitting the ceiling. We…
Read More “WebFlux vs. Virtual Threads in 2026: The Senior Architect’s Decision Matrix” »
Why I Switched to Virtual Threads (And Why You Should Too) In a recent high-traffic Spring Boot application I worked on, we hit a frustrating wall: our servers were crashing under load, yet our CPU usage was sitting at only 20%. The problem? We had exhausted our Tomcat thread pool. Our “Platform Threads” were stuck…
Read More “Java Virtual Threads (Project Loom) in Real Enterprise Applications” »
Java Sealed Classes Recondite yet practical, sealed classes give you a way to declare a fixed set of permitted subclasses, enabling safer APIs, exhaustive pattern matching and clearer domain modeling. By constraining inheritance you reduce unintended extensions, simplify reasoning about behavior, and enable compiler/JVM optimizations that can improve memory utilization and performance. Use cases include…
Over recent Java versions, you might have noticed the introduction of the Java record class, a compact and immutable data carrier designed to simplify your code. Unlike traditional classes, records automatically provide implementations for equals and hashCode, saving you time and reducing errors. You’ll find that records come with a default constructor and default values…
Read More “Java Record Class Explained: Simple, Immutable Data Carriers” »