RuoYi is a production‑ready Java rapid‑development framework for building enterprise back‑office management systems (CMS, CRM, OA, etc.). It is a monolithic Spring Boot application using Apache Shiro for authentication/authorization, MyBatis for persistence, Thymeleaf for server‑side rendering, and a jQuery/Bootstrap frontend with numerous third‑party plugins. The system provides a complete RBAC module (user, role, department, menu management), dictionary and configuration management, operation and login auditing, online user monitoring, Quartz‑based scheduled tasks, and a Velocity‑powered code generator that produces full CRUD modules from database tables. Additional features include dynamic data source switching, XSS/CSRF protection, captcha, file upload/download, Excel import/export with annotation‑driven mapping, and a demo suite for UI components. The architecture follows a modular Maven structure (admin, common, framework, system, generator, quartz) with a shared common module providing utilities, annotations, and exception hierarchy. While the framework is mature and widely adopted, its frontend stack (jQuery, Bootstrap 3‑era plugins) and use of Shiro represent technical drift compared to modern SPA or Spring Security approaches. The codebase is well‑organized and contains several reusable components, but is tightly coupled to its own conventions and lacks microservice readiness.