1. Define security requirements based on application functionality and data sensitivity.
2. Configure Spring Security with appropriate authentication and authorization mechanisms.
3. Implement input validation using Bean Validation and sanitize user inputs.
4. Protect against CSRF attacks by enabling CSRF protection or disabling it for stateless APIs.
5. Manage secrets securely by loading them from environment variables or a vault.
6. Configure security headers to mitigate common web vulnerabilities.
7. Implement rate limiting to prevent abuse of expensive endpoints.
8. Regularly scan dependencies for known vulnerabilities and update them.