This interactive, self-paced course consists of 86 levels grouped into 3 quests covering every topic you need: from designing REST APIs and input validation to entity mapping, transactions, authentication, and securing APIs. You'll find more than 430 lectures and 800+ hands-on tasks.

We built a dedicated practice environment where you can experiment with code safely. All programs compile and run in real time, and you see the result instantly. This lets you learn by doing without installing complex tools at the start.

The course has more than 800 tasks across Spring MVC, JPA, and Security to help you master all the key skills. You'll learn to design REST endpoints and DTOs, set up Bean Validation and an error contract, create entity mappings and relationships between tables, write JPQL queries, manage transactions, configure authentication and authorization, and work with CSRF, CORS, and JWT. Every task comes with clear instructions and instant solution checking.

After you submit a solution for checking, you'll see a detailed report: which requirements are met and which are not. Instead of guessing why your program crashes or won't compile, you know exactly what to fix.

All your programs are checked automatically and instantly. The system verifies not only syntax correctness but also runtime logic, including the correctness of the REST contract, the entity mapping, and the security configuration. You get feedback right away and can improve your solution.

Our algorithms analyze your solution, and if it isn't optimal, you get smart recommendations from a virtual AI mentor. The system will suggest how to design DTOs properly, choose a fetch strategy instead of naive loading, eliminate the N+1 problem, set up transactional boundaries, organize the error contract cleanly, and securely configure the SecurityFilterChain, CSRF, and JWT.