Struts
Struts is an open-source web application framework for developing Java EE web applications. It follows the Model-View-Controller (MVC) architectural pattern, providing a structured approach to building scalable and maintainable web applications. It was widely used in enterprise environments for handling HTTP requests, managing application flow, and integrating with Java technologies like JSP and servlets.
Developers should learn Struts when working on legacy enterprise Java web applications or maintaining systems built during its peak popularity in the early 2000s. It is useful for understanding MVC implementation in Java EE and for projects requiring a robust, configuration-driven framework with built-in features like form validation and internationalization. However, for new projects, modern alternatives are generally recommended due to Struts' age and security concerns.