Java Authentication and Authorization with Apache Shiro

security library and authentication and authorization framework,
the Apache Shiro security manager,
the Shiro realm is the source of information for login credentials validation,
the "hello, world" Shiro application requires a single dependency,
the killer use cases of Apache Shiro are permissions,
a role comprises multiple permissions,
using multiple realms at the same time with Apache Shiro and realm chaining,
Shiro means Castle in Japanese,
Apache Shiro Jakarta EE integration,