Blog of Vincent VAUBAN

🔥⚙️ HOTSPOT JVM: HOW JAVA GETS FAST WITHOUT MAKING YOU WRITE C++

January 9, 2026 · java,performance

🔸 TL;DR HotSpot made Java fast by using runtime profiling + JIT compilation to optimize the...

🧠🧑‍💻 PROGRAMMER CONSENSUS BIAS: when your team agrees… and users still struggle

January 9, 2026 · programmmer,techlead

🔸 TL;DR Dev consensus can lie. Users don’t think like programmers. Watch users attempt real...

🧱⏳ IS JAVA THE NEW COBOL? (AND WHY THAT’S NOT AN INSULT)

January 9, 2026 · java,programmmer,techlead

🔸 TL;DR ▪️ If Java becomes “the new COBOL,” it might simply mean: it’s trusted for critical...

🍃🎓 SPRING CERTIFICATION — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod14

January 9, 2026 · springboot,spring,certification

🔸 WHY SPRING CERTIFICATION IS A GREAT ASSET TODAY ▪️ Validates real-world, production-ready...

⏱️📅 EJB TIMER QUIZ: CAN YOU READ THIS @SCHEDULE?

January 9, 2026 · jakartaee

🔸 THE CHALLENGE (TRY BEFORE YOU SCROLL) You have an EJB timer method annotated like this: ...

🪝⏪ USEPREVIOUS HOOK: TRACK THE LAST VALUE IN REACT (WITHOUT EXTRA STATE)

January 9, 2026 · react,programmmer

Ever needed to compare what you have now vs what you had last render? That’s exactly what...

⚡🚀 API PERFORMANCE OPTIMIZATION: SPEED UP WITHOUT BREAKING UX

January 9, 2026 · techlead,programmmer,api

When an API feels “slow”, it’s rarely one thing. It’s usually too much data, too many calls, or...

☕🎓 JAVA 21 OCP — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod14

January 9, 2026 · java,java21,certification,ocp

☕🎓 JAVA 21 OCP — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 🔸 WHY JAVA CERTIFICATION IS A...

🧱🧭 TOO MANY LAYERS MAKE CODE HARDER TO MAINTAIN (AND EXTEND)

January 8, 2026 · cleancode

You’ve probably seen it: Controller → Service → Facade → Manager → Helper → Adapter → Provider...

☕🗞️ POLL: What’s your main source for Java articles? INSIDE_JAVA/ FOOJAY/ INFOQ/ OTHER

January 8, 2026 · java

Why these choices? ▪️ Inside.java → straight from the OpenJDK / Java platform ecosystem: JEPs,...

🗄️🔁 OBJECT-RELATIONAL MAPPING (ORM) WITH JPA — WHAT IT REALLY DOES (AND WHAT IT DOESN’T)

January 8, 2026 · jakartaee,java

🔸 TL;DR ▪️ JPA maps Java objects to relational tables so you work with entities instead of raw...

2️⃣0️⃣2️⃣5️⃣Spring Boot 2025 Rewind ⏪🍃

January 8, 2026 · spring,self-promo

As a passionate advocate for cloud-native Java development, I’ve been actively producing...

🛠️🧠 REFACTORING: CLEANER CODE WITHOUT CHANGING BEHAVIOR

December 29, 2025 · cleancode,craftsmanship,programmmer,techlead

🔸 TLDR ▪️ Refactoring = improving code structure without changing what it does ✅ ▪️ Do it in...

🪄🧠 JAVA “MAGIC” TYPES: THE ONES YOU CAN’T NAME

December 29, 2025 · java,programmmer,techlead

Java’s type system has a few “ghost” types: the compiler uses them, you benefit from them… but...

🍃🎓 SPRING CERTIFICATION — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod13

December 29, 2025 · springboot,spring,certification,vcp,slides

🔸 WHY SPRING CERTIFICATION IS A GREAT ASSET TODAY ▪️ Validates real-world, production-ready...

🧩🌐 JAKARTA FACES (JSF): SERVER-SIDE UI FOR JAVA WEB APPS

December 29, 2025 · jakartaee,programmmer

🔸 TLDR JSF/Jakarta Faces is a component-based, server-side UI framework for Java web apps,...

🧠💾 REACT: A PRACTICAL useLocalStorage HOOK

December 29, 2025 · react,programmmer

🔸 TLDR ▪️ A useLocalStorage hook keeps your React state persistent by reading from localStorage...

🔎🧵 DISTRIBUTED TRACING: FOLLOW A REQUEST ACROSS MICROSERVICES (WITHOUT GUESSING)

December 29, 2025 · api,programmmer,techlead

🔸 TL;DR Distributed tracing lets you see a single request hop through multiple services using...

☕🎓 JAVA 21 OCP — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod13

December 29, 2025 · java,java21,ocp,certification,slides

🔸 WHY JAVA CERTIFICATION IS A GREAT ASSET TODAY ▪️ Signals up-to-date skills (Java 21: virtual...

🧩🧹 SPLIT OVERLOADED CLASSES INTO SPECIFIC ONES (WITHOUT OVER-ENGINEERING)

December 29, 2025 · cleancode,programmmer,techlead,craftsmanship

That Clean Code recommendation — “Split overloaded classes into specific ones.” — is basically a...

All Categories - Blog of Vincent VAUBAN

🔥⚙️ HOTSPOT JVM: HOW JAVA GETS FAST WITHOUT MAKING YOU WRITE C++

🧠🧑‍💻 PROGRAMMER CONSENSUS BIAS: when your team agrees… and users still struggle

🧱⏳ IS JAVA THE NEW COBOL? (AND WHY THAT’S NOT AN INSULT)

🍃🎓 SPRING CERTIFICATION — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod14

⏱️📅 EJB TIMER QUIZ: CAN YOU READ THIS @SCHEDULE?

🪝⏪ USEPREVIOUS HOOK: TRACK THE LAST VALUE IN REACT (WITHOUT EXTRA STATE)

⚡🚀 API PERFORMANCE OPTIMIZATION: SPEED UP WITHOUT BREAKING UX

☕🎓 JAVA 21 OCP — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod14

🧱🧭 TOO MANY LAYERS MAKE CODE HARDER TO MAINTAIN (AND EXTEND)

☕🗞️ POLL: What’s your main source for Java articles? INSIDE_JAVA/ FOOJAY/ INFOQ/ OTHER

🗄️🔁 OBJECT-RELATIONAL MAPPING (ORM) WITH JPA — WHAT IT REALLY DOES (AND WHAT IT DOESN’T)

2️⃣0️⃣2️⃣5️⃣Spring Boot 2025 Rewind ⏪🍃

🛠️🧠 REFACTORING: CLEANER CODE WITHOUT CHANGING BEHAVIOR

🪄🧠 JAVA “MAGIC” TYPES: THE ONES YOU CAN’T NAME

🍃🎓 SPRING CERTIFICATION — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod13

🧩🌐 JAKARTA FACES (JSF): SERVER-SIDE UI FOR JAVA WEB APPS

🧠💾 REACT: A PRACTICAL useLocalStorage HOOK

🔎🧵 DISTRIBUTED TRACING: FOLLOW A REQUEST ACROSS MICROSERVICES (WITHOUT GUESSING)

☕🎓 JAVA 21 OCP — TEST YOURSELF (3 QUESTIONS IN THE CAROUSEL) 🚀 episod13

🧩🧹 SPLIT OVERLOADED CLASSES INTO SPECIFIC ONES (WITHOUT OVER-ENGINEERING)

☕🍃🔍

🔥⚙️ HOTSPOT JVM: HOW JAVA GETS FAST WITHOUT MAKING YOU WRITE C++

🧠🧑‍💻 PROGRAMMER CONSENSUS BIAS: when your team agrees… and users still struggle

🧱⏳ IS JAVA THE NEW COBOL? (AND WHY THAT’S NOT AN INSULT)