Spring Boot REST API for tax filing management with MySQL persistence, user-linked filings, Thymeleaf login, and OAuth2 Keycloak security configuration.

Advanced RBAC implementation using Spring Security 6. Includes Method-Level Security (@PreAuthorize), custom AccessDeniedHandler, and Global Exception Handling.

A Spring Boot security project featuring JWT authentication, role & permission-based access control, and fine-grained endpoint protection using Spring Security’s pre/post authorization and filtering.

Hospital Management System (HMS) backend with Spring Boot 4, JWT Authentication, RBAC, Method Security (@PreAuthorize), Ownership Validation, JPA relationships & secure appointment management.