Spring Boot vs Spring Framework

Introduction

A common point of confusion for newcomers is the relationship between "Spring" and "Spring Boot." They are not competitors and they are not the same thing — Spring Boot is built directly on top of Spring Framework. This lesson draws a clear line between what each one is responsible for.

Spring Framework: The Foundation

Spring Framework provides the core building blocks: the Inversion of Control (IoC) container, dependency injection, Aspect-Oriented Programming (AOP), transaction management, and the Spring MVC web framework. It is powerful, but using it directly means you are responsible for configuring all of these pieces yourself, deciding which server to deploy to, and wiring dependencies by hand.

What Spring Boot Adds

Spring Boot does not replace any of that. Instead, it adds three things on top of it:

Here is the same functionality expressed both ways. First, a simplified plain Spring Framework setup using Java configuration.

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.programinds.demo")
public class AppConfig {
    // You must manually configure a DispatcherServlet,
    // register it with a servlet container (deployed as a WAR),
    // and manually declare any additional beans you need.
}

Now the same application in Spring Boot.

@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

The Spring Boot version needs no `web.xml`, no external Tomcat installation, and no manual `DispatcherServlet` registration — `@EnableAutoConfiguration` (bundled inside `@SpringBootApplication`) detects `spring-boot-starter-web` on the classpath and configures all of it automatically.

Side-by-Side Comparison

Common Mistakes

Best Practices

Frequently Asked Questions

Key Takeaways

Summary

Spring Boot and Spring Framework are not alternatives — Spring Boot is a productivity layer sitting on top of Spring Framework, adding auto-configuration, embedded servers, and starters so you spend your time writing business logic instead of wiring beans. Next, you will set up your very first Spring Boot project using Spring Initializr.