☕ Modern Spring & Testing Updates — Spring Boot 4, Spring 7 & JUnit 6
Keeping up with the latest in Spring and testing frameworks is essential for building scalable, reactive, and maintainable applications . Here’s a complete and updated overview of what’s new in Spring Boot 4 , Spring Framework 7 , and JUnit 6 — including real examples, architectural insights, and practical features for enterprise microservices. 🚀 1️⃣ Spring Boot 4 — Key Enhancements 💨 Faster startup and lower memory footprint using improved AOT ☁️ Better cloud-native support and Spring Cloud integration 📊 Observability by default (Micrometer 2 + OpenTelemetry) 🧩 Complete modularization — giant auto-config JAR split into dozens of small modules 🔒 Built-in null-safety using JSpecify annotations 🛠️ New @ConfigurationPropertiesSource for modular configuration metadata 📉 Improved SSL health reporting (e.g., expiringChains ) 📝 Fully optimized for GraalVM native images ⚡ Virtual threads support (Java 21/25) for 10,000+ concurrent requests 🗂️ First-...