java-springboot

Overview

A comprehensive Spring Boot best practices skill for GitHub Copilot that guides developers in writing high-quality Spring Boot applications. It covers the full application stack — from project setup and dependency injection through REST API design, data access with JPA, security configuration, logging, and testing strategies — all following established community conventions.

Key Features

• Project structure guidance: Recommends organizing code by feature/domain rather than by layer, and using Spring Boot starters for streamlined dependency management with Maven or Gradle.
• Constructor-based dependency injection: Enforces constructor injection with private final fields for explicit, testable dependencies across @Service, @Repository, and @Controller components.
• REST API and DTO patterns: Promotes clean RESTful endpoint design, input validation via JSR 380 annotations, DTO-based data transfer (never exposing JPA entities), and centralized error handling with @ControllerAdvice.
• Configuration and security best practices: Advocates type-safe properties with @ConfigurationProperties, Spring Profiles for environment management, externalized secrets, and Spring Security with BCrypt password encoding and input sanitization.
• Comprehensive testing strategy: Covers unit tests with JUnit 5 and Mockito, integration tests with @SpringBootTest, targeted test slices (@WebMvcTest, @DataJpaTest), and Testcontainers for realistic database testing.

Who is this for?

This skill is ideal for Java developers building Spring Boot applications who want Copilot to consistently apply industry best practices. Whether you are starting a new microservice, refactoring legacy code, or onboarding teammates to Spring Boot conventions, this skill ensures generated code follows proper layered architecture, clean configuration, and robust testing patterns.