Learn SPRING-BOOT with Real Code Examples

Install JDK 17+

Set up Maven or Gradle project

Add Spring Boot starter dependencies

Create main application class annotated with `@SpringBootApplication`

Run with `mvn spring-boot:run` or IDE run configuration

Install JDK 17+

Install Maven or Gradle

Set up IDE (IntelliJ, Eclipse, VSCode)

Create Spring Boot project via Initializr

Verify server starts locally

pom.xml / build.gradle - dependencies

application.properties / application.yml - config

MainApplication.java - entry point class

controllers/ - REST controllers

services/ - business logic classes

spring init -> create project using Spring CLI

mvn spring-boot:run -> run app with Maven

gradle bootRun -> run app with Gradle

java -jar target/app.jar -> run packaged JAR

mvn clean package -> build production JAR

Spring MessageSource for i18n

UTF-8 encoding by default

Locale-specific messages and templates

Integration with translation libraries

Supports multi-language enterprise apps

Accessible via HTTP/S clients

Supports CORS configuration

Works on all platforms with JVM

Middleware (filters/interceptors) ensures security

Internationalization supported via MessageSource

Spring Boot primarily backend

Serve static files via `resources/static`

Integrate with frontend frameworks (React, Angular, Vue)

Render templates with Thymeleaf or FreeMarker

Provide JSON APIs for SPA/frontend apps

Stateless REST endpoints by default

Session management via Spring Security

Persistent state via database/repositories

Cache with Spring Cache or Redis

Application context holds beans and configuration

Parse JSON requests/responses

Validate inputs via Bean Validation (JSR 380)

Connect to SQL/NoSQL databases via Spring Data

Cache frequently accessed data

Log and monitor data access operations