Introduction to Java / Spring Boot

The editor in this platform is a SYNTAX AND COMPILATION VALIDATOR ONLY. It does NOT run a live Spring Boot server. You cannot make HTTP requests to localhost here.

• Checks your Java syntax for errors
• Validates Spring annotations like @RestController and @Service
• Verifies import statements are correct
• Confirms method signatures match expectations
• Compiles your code using javac with Spring Boot libraries on classpath

• Start an embedded Tomcat server
• Handle HTTP requests or responses
• Perform dependency injection at runtime
• Connect to databases

1. Create a Spring Boot project using Spring Initializr at start.spring.io
2. Copy your validated code into the project
3. Run ./mvnw spring-boot:run in your terminal
4. Visit http://localhost:8080 to test your API

This means your code is syntactically perfect and would compile in a real Spring Boot project. Your lab is complete. Take the code to your local environment to see it running.

This Spring Boot track assumes you have already completed the Java Programming Masterclass. You must be comfortable with:

• Java syntax including variables, loops, conditionals, and methods
• Object-Oriented Programming including classes, inheritance, polymorphism, and interfaces
• Exception handling with try-catch-finally
• Collections Framework including Lists, Maps, and Sets
• Basic file I/O and streams

If you have not completed the Java track, please do that first. Spring Boot builds directly on top of Java — you cannot skip the foundation.

After completing the Java track, return here to master Spring Boot for enterprise backend development.