spring-boot-development_skill

Overview

This skill delivers practical, end-to-end guidance for building Spring Boot applications using auto-configuration, dependency injection, REST APIs, Spring Data JPA, and security. It focuses on patterns and configurations that make applications production-ready, testable, and maintainable. Use it to accelerate backend development for enterprise and cloud-native services.

How this skill works

The skill explains how Spring Boot auto-configures components based on classpath dependencies and application properties, and how to override or exclude those configurations. It covers recommended dependency injection patterns (constructor injection), REST controller design, request/response handling, and repository patterns with Spring Data JPA. It also shows configuration via application.properties or YAML, environment profiles, and common production concerns like monitoring and security.

When to use it

• Building RESTful APIs or microservices with Spring Boot
• Creating data-driven applications using JPA and repositories
• Implementing authentication and authorization with Spring Security
• Migrating from legacy Spring configuration to Spring Boot
• Preparing applications for production with actuator, logging, and profiles

Best practices

• Prefer constructor injection for testability and immutability
• Use @RestController with ResponseEntity to control status codes and headers
• Keep domain entities lean; use DTOs for external APIs
• Leverage Spring Data repositories and paging/sorting instead of manual queries
• Externalize environment-specific values in properties/YAML and use profiles

Example use cases

• Implementing a CRUD REST API for users with validation and proper HTTP status codes
• Configuring a PostgreSQL-backed repository with paging, sorting, and custom queries
• Protecting endpoints using Spring Security with role-based access control
• Building health checks and metrics with Spring Boot Actuator for monitoring
• Creating environment-specific builds (dev, test, prod) using application-{profile}.yml