- https://docs.spring.io/spring-data/jpa/docs/2.1.0.M1/reference/html/#jpa.query-methods.query-creation
- https://httpstatuses.com/
- https://docs.oracle.com/javaee/7/api/javax/validation/constraints/package-summary.html
- https://regexr.com/
- https://mdbootstrap.com/components/e-commerce/
- https://mdbootstrap.com/freebies/ecommerce-template/
- https://getbootstrap.com/docs/4.0/components/forms/#checkboxes-and-radios-1