Apache Shiro
Apache Shiro is a powerful and easy-to-use Java security framework that provides authentication, authorization, cryptography, and session management. It simplifies application security by offering a clean API to handle common security tasks like user login, role-based access control, and data encryption. Shiro works with any Java application, including web, desktop, and command-line applications.
Developers should learn Apache Shiro when building Java applications that require robust security features without the complexity of larger frameworks like Spring Security. It's particularly useful for lightweight applications, legacy systems, or projects where fine-grained control over security is needed, such as custom authentication schemes or session management. Shiro is ideal for scenarios requiring simple integration, like securing REST APIs or managing user permissions in enterprise applications.