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Spring Boot REST API with JWT Authentication

76% time saved, 2 hours vs 8.5 hours development time

Secure Spring Boot REST API built entirely with GitHub Copilot CLI as the primary development assistant for a Dev.to community challenge. Demonstrates leveraging Copilot CLI from initial scaffolding through complete implementation—generating layered architecture (controller, service, repository, entity, DTOs), implementing JWT stateless authentication with HS512 signing and BCrypt hashing, configuring Spring Security filter chains with role-based access control, and systematically debugging Spring Security 403 errors. Features multi-database support (PostgreSQL production, H2 development), global exception handling, and bean validation. Achieved 76% productivity gain (8.5 hours → 2 hours) through iterative AI-assisted prompts and code generation.

Spring Boot 3.2.0Spring SecurityJWT (jjwt 0.12.3)Spring Data JPAPostgreSQLH2 DatabaseMavenJava 17GitHub Copilot CLI
GitHubLive Demo

Problem

Dev.to challenge to build production-grade Spring Boot application using GitHub Copilot CLI as the primary coding assistant, demonstrating AI-driven development workflow from scaffolding to deployment

Solution

Used Copilot CLI for entire development lifecycle—generating complete layered architecture, implementing JWT security configurations, debugging Spring Security authentication issues, and creating comprehensive documentation through systematic prompts and iterative refinement

Key Highlights

  • ●Built 100% with GitHub Copilot CLI as primary development tool
  • ●Complete code generation: entities, repositories, services, controllers, DTOs
  • ●JWT authentication implementation via AI-assisted prompts
  • ●Systematic debugging of Spring Security 403 errors with CLI guidance
  • ●76% time reduction: 8.5 hours → 2 hours development time
  • ●Multi-database support (PostgreSQL production / H2 dev)
  • ●Role-based access control with custom JWT filter chains
  • ●Global exception handling and bean validation
  • ●Comprehensive documentation generated with CLI assistance
  • ●Featured in Dev.to article on AI-driven development workflow