Spring and Spring Boot are not competing frameworks.
Spring Boot is built on top of Spring. It keeps Spring’s dependency injection, MVC, data access and transaction support while reducing the setup needed to start and operate an application.
🔸 TL;DR
▪️ Spring is the foundation.
▪️ Spring Boot is the faster, opinionated way to build and run Spring applications.
▪️ Boot reduces configuration, but it does not remove Spring or prevent customization.
🔸 1. FOUNDATION VS RAPID APPLICATION SETUP
🅰️ Spring:
var context =
new AnnotationConfigApplicationContext(AppConfig.class);
🅱️ Spring Boot:
@SpringBootApplication
class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
Spring provides the core container and programming model.
Spring Boot adds an opinionated bootstrap process around it.
🔸 2. EXPLICIT CONFIGURATION VS AUTO-CONFIGURATION
🅰️ Spring:
@Bean
DataSource dataSource() {
return new HikariDataSource(config());
}
🅱️ Spring Boot:
spring.datasource.url=jdbc:postgresql://localhost/app
spring.datasource.username=app
With Spring, you commonly declare infrastructure beans yourself.
Spring Boot can configure them automatically from the classpath and properties; and backs off when you provide your own configuration.
🔸 3. INDIVIDUAL MODULES VS STARTERS
🅰️ Spring:
spring-webmvc
🅱️ Spring Boot:
spring-boot-starter-web
Spring modules give you granular control.
Boot starters group commonly used dependencies, while Boot dependency management aligns compatible versions.
🔸 4. SERVLET CONTAINER SETUP VS EMBEDDED SERVER
🅰️ Spring MVC:
registration.addMapping("/");
🅱️ Spring Boot:
java -jar application.jar
A traditional Spring MVC application can be deployed to an external servlet container.
A typical Spring Boot web application starts with an embedded server and can run as an executable JAR.
🔸 5. ASSEMBLING OPERATIONS VS PRODUCTION-READY FEATURES
🅱️ spring-boot-starter-actuator
GET /actuator/health
Spring gives you the building blocks.
Spring Boot adds conventions and integrations for health checks, metrics, externalized configuration and application monitoring.
🔸 TAKEAWAYS
▪️ Learn Spring concepts: dependency injection, beans, MVC and transactions.
▪️ Use Spring Boot for most new Spring applications.
▪️ Override Boot defaults when your architecture requires more control.
Spring Boot is not simply “Spring made easy.”
It is Spring with sensible defaults, automated setup and production-oriented tooling. ☕🚀
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