Spring Boot Best Practices

What this best practices guide is

A practical guide to Spring Boot best practices for Java developers building REST services. It covers versions and the new modular starters, dependency injection and structure, typed configuration, the web layer and error responses, JPA and transactions, virtual threads, securing Actuator, testing with slices and Testcontainers, and running cleanly in production.

It has 9 chapters and 37 practices, each with why it matters, what to do and what to avoid. For Java backend developers.

Chapter by chapter

1. Versions, starters and dependencies (4 practices)

Which Spring Boot and Java versions to run, how the modular starters in Spring Boot 4 work, and how to keep dependency versions consistent.

2. Structure and dependency injection (4 practices)

How to organise packages and wire beans so the code stays testable and the application context stays easy to reason about.

3. Configuration and profiles (4 practices)

How to bind settings into typed, validated objects, keep secrets out of the repository and use profiles without creating a separate app per environment.

4. The web layer: DTOs, validation and errors (5 practices)

How to shape requests and responses, validate input, return consistent error bodies and call other services without hanging.

5. Data access with JPA and transactions (5 practices)

The JPA defaults and patterns that cause most production performance and correctness problems, and what to use instead.

6. Virtual threads and performance (3 practices)

When to switch on virtual threads, what changes when you do, and the settings that matter more than any code tweak.

7. Security and Actuator (4 practices)

How to keep Spring Security on and Actuator endpoints from becoming the easiest way into your service.

8. Testing (4 practices)

How to test Spring Boot apps quickly: unit tests without Spring, slice tests for one layer, and full tests against real services in containers.

9. Running in production (4 practices)

Shutdown, health probes, observability and container images: the settings that decide how a Spring Boot service behaves on deploy day.

How it works on Sefism

The guide reads like a short course: a syllabus, then one chapter per page in a focused reader, with a quiz at the end of each chapter for members. The opening chapters are open to everyone. Adding it to your account uses credits, opens every chapter and keeps your progress.

Every claim is checked against the sources listed on the page (8 cited).