Adaptive skill practice — find your level, get sharper.

Spring Boot practice

DI, REST, and data — the backbone of Java backends

Master Spring Boot (v4 / Spring Framework 7) — the IoC container and dependency injection, beans, stereotypes and scopes, auto-configuration and starters, building REST controllers, Spring Data JPA repositories and transactions, configuration and profiles, validation and global exception handling, Actuator, and testing. Core concepts are evergreen; version-specific changes (Jakarta EE 11, JSpecify null-safety, Jackson 3, REST API versioning) are tagged (Spring Boot 4). Part of the Developer track.

• Meets you at your level — never too easy, never too hard.

• Adapts every question to how you’re doing.

• Tracks your level over time. Skill practice, not a test.

New here? Read the Spring Boot guide

A free 16-minute primer — the mental model, the mistakes beginners make, and what to practise first.

Curriculum

193 concepts across 27 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. What Spring Boot is, and how an application starts

B. The IoC container and bean definitions

C. Dependency injection and wiring

D. Bean scopes and lifecycle

E. Auto-configuration and how conditions resolve

F. Starters, dependency management and the build

G. Externalized configuration and binding

H. Profiles and the Environment

I. The servlet web layer

J. Validation and error handling

K. Reactive: WebFlux versus MVC

L. Calling other services

M. Spring Data JPA and persistence

N. Transactions

O. AOP and proxying

P. Spring Security

Q. Testing

R. Actuator and observability

S. Packaging, images and native builds

T. Asynchronous and scheduled work

U. Logging and running in production

V. Spring Boot 4 and Framework 7: what changed

W. Resilience: retry, recovery and circuit breaking

X. Messaging and asynchronous integration

Y. Caching — the abstraction

AA. Cache providers and auto-configuration

Z. Distributed systems: config, discovery and gateways

View the full curriculum →

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