Introduction to Spring Boot 4
Understand the philosophy, advantages, and key features of Spring Boot 4, and set up your development environment.
Introduction to Spring Boot 4 is a free Spring Boot 4 Complete Guide lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Spring Boot 4 Complete Guide learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Meet Spring Boot!
Spring Boot is built on the Spring Framework to make production-ready apps faster to build. Think of it as a smart assistant that wires sensible defaults so you just write your logic.
Say Goodbye to Boilerplate!
Old Spring meant walls of XML and boilerplate config. Spring Boot kills that with convention over configuration and auto-configuration — less setup, more building.
Key Benefits at a Glance
Spring Boot's wins: standalone runnable JARs, embedded servers, smart auto-configuration, opinionated defaults, and production features like health checks and metrics.
Your App, Your Server
An embedded server ships inside your JAR, so your app runs as a plain Java program — no external Tomcat to deploy to. Tomcat is default; Jetty and Undertow are options.
Auto-Configuration Magic
Auto-configuration reads your dependencies and sets things up for you. Add Spring Web and it wires an embedded server and dispatcher servlet — no boilerplate config needed.
Your Project's Launchpad
Spring Initializr is the recommended way to start: pick your language, version, and dependencies, then download a ready-to-import Maven or Gradle project.
Get Ready to Code!
You'll need three things: a JDK (17+ recommended), an IDE like IntelliJ, Eclipse, or VS Code, and a build tool — Maven or Gradle.
Is Java Ready?
Confirm your JDK is set up: run java -version in your terminal. Then try this tiny program to prove everything works.
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Java is working!");
}
}The Core Application Class
Every Spring Boot app has a main class with @SpringBootApplication, which bundles @SpringBootConfiguration, @EnableAutoConfiguration, and @ComponentScan. Its main method is your entry point.
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyFirstSpringBootApp {
public static void main(String[] args) {
SpringApplication.run(MyFirstSpringBootApp.class, args);
System.out.println("Spring Boot app started!");
}
}Test Your Knowledge!
Which of the following is NOT a primary advantage of Spring Boot?
Lesson Summary
Nice work! You met Spring Boot, its auto-config and embedded servers, Spring Initializr, the tools you need, and the @SpringBootApplication annotation. Next: your first Hello World app.
Frequently asked questions
Is the “Introduction to Spring Boot 4” lesson free?
Yes — the full text of “Introduction to Spring Boot 4” is free to read here on the web, and the Spring Boot 4 Complete Guide course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Spring Boot 4 Complete Guide course, upgrade to CoddyKit PRO.
What will I learn in “Introduction to Spring Boot 4”?
Understand the philosophy, advantages, and key features of Spring Boot 4, and set up your development environment. You practise Spring Boot 4 Complete Guide with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Spring Boot 4 Complete Guide?
No prior experience is required. Spring Boot 4 Complete Guide on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Introduction to Spring Boot 4” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Spring Boot 4 Complete Guide lesson?
Yes. Every Spring Boot 4 Complete Guide lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Introduction to Spring Boot 4
- Creating Your First Application
- Spring Boot Auto-Configuration
- Understanding the Spring Boot Project Structure