Spring Boot (2014 launch) Spring ecosystem ka SABSE POPULAR project hai — ye Spring KO REPLACE nahi karta, balki ISKE UPAR ek "OPINIONATED" layer add karta hai jo application SETUP ko RADICALLY simplify karta hai. "Opinionated" matlab — Spring Boot ke DEVELOPERS ne, INDUSTRY ke MOST COMMON use-cases dekh ke, SENSIBLE DEFAULTS PEHLE SE decide kar diye hain.

Iska MATLAB, ek NAYA Spring Boot project SECONDS mein READY ho sakta hai (start.spring.io se), bina XML config likhe, bina Tomcat manually setup kiye, bina dependency versions manually match kiye. Ye Spring Boot ko STARTUPS se lekar BADI enterprises tak, HAR JAGAH DEFAULT choice banaता hai naye Java backend projects ke liye.

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}
// java -jar myapp.jar chalाते hi:
// ✓ Embedded Tomcat start, port 8080
// ✓ Component scanning automatic
// ✓ Auto-configuration classpath ke hisaab se apply
// ✓ Application 2-3 seconds mein READY