Understanding Spring, Spring MVC, and Spring Boot: Core Problems Solved and Best Use Cases

In this article you will get an overview of Spring, Spring MVC and Spring Boot, understand the core problems they solve and learn the best places to apply them. Spring Framework’s most important feature is Dependency Injection (DI) / Inversion of Control (IoC), which enables loose‑coupled applications that are easy to unit‑test.

1. What core problem does the Spring framework solve?

Spring’s core is DI/IoC. By managing bean creation and wiring, developers avoid tightly coupled code and can replace implementations easily during testing.

2. Example without Dependency Injection

WelcomeService service = new WelcomeService();
WelcomeController controller = new WelcomeController(service);
String message = controller.welcome();

Here the controller creates the service directly, making the two classes tightly coupled and hard to mock in tests.

3. Same example using Dependency Injection

Spring simplifies this with two annotations: @Component – tells Spring to manage the class as a bean. @Autowired – tells Spring to inject the appropriate bean where needed.

@Component
public class WelcomeService {
    public String retrieveWelcomeMessage() { return "Welcome"; }
}

@RestController
public class WelcomeController {
    @Autowired
    private WelcomeService service;
    @RequestMapping("/welcome")
    public String welcome() { return service.retrieveWelcomeMessage(); }
}

During unit testing a mock of WelcomeService can be injected into the controller, allowing isolated testing.

4. Additional problems solved by Spring Framework

Problem 1: Reduce boilerplate code

Spring JDBC

Spring MVC

Spring AOP

Spring ORM

Spring JMS

Spring Test

Modules such as JdbcTemplate and JmsTemplate dramatically reduce the amount of code compared with raw JDBC or JMS.

Problem 2: Good integration with other frameworks

Hibernate for ORM

iBatis for object mapping

JUnit and Mockito for unit testing

5. Core problem solved by Spring MVC

Spring MVC provides a clean separation for web applications using DispatcherServlet, ModelAndView, and ViewResolver, making it easy to develop web layers.

6. Why we need Spring Boot

Traditional Spring applications require extensive XML or Java configuration (component scanning, dispatcher servlet, view resolver, data source, transaction manager, etc.). Spring Boot introduces auto‑configuration: it inspects the classpath and automatically configures beans for common libraries, drastically reducing boilerplate.

Spring Boot auto‑configuration

When a library JAR (e.g., Hibernate or Spring MVC) is present on the classpath, Spring Boot automatically creates the necessary beans (data source, DispatcherServlet, etc.) unless the developer overrides them.

Spring Boot starter projects

Starters are convenient dependency descriptors that pull in a set of compatible libraries. For a typical web application you would use:

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Other common starters include:

spring-boot-starter-web-services (SOAP)

spring-boot-starter-test (testing)

spring-boot-starter-jdbc (traditional JDBC)

spring-boot-starter-hateoas (HATEOAS support)

spring-boot-starter-security (authentication/authorization)

spring-boot-starter-data-jpa (Spring Data JPA with Hibernate)

spring-boot-starter-cache (caching support)

spring-boot-starter-data-rest (expose REST services via Spring Data)

spring-boot-starter-actuator (monitoring and tracing)

spring-boot-starter-undertow / spring-boot-starter-jetty / spring-boot-starter-tomcat (choose embedded servlet container)

spring-boot-starter-logging (Logback)

spring-boot-starter-log4j2 (Log4j2)

These starters bundle the core Spring modules, web MVC, JSON binding (Jackson), validation (Hibernate Validator), embedded servlet container (Tomcat), and logging (Logback/SLF4J), so developers do not need to manage individual versions.

Original source: https://dzone.com/articles/spring-boot-vs-spring-mvc-vs-spring-how-do-they-compare Author: Ranga Karanam Translator: Yunooa