Open Source Web Frameworks in Java

Vaadin is a web application framework for Rich Internet Applications (RIA). In contrast to Javascript libraries and browser-plugin based solutions, it features a server-side architecture, which means that the largest part of the logic runs on the server. Ajax technology is used on the browser side to ensure a rich and interactive user experience. Developers compose the application user interface from components such as the Button, Table and Tree. The components use events, listeners and data binding to communicate with each other and with business logic. The component-based architecture together with the data binding features help building applications that are easily modularized and refactored as needed.