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Vaadin Lets Java Developers Build Full Web UIs Without JavaScript Frameworks

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Vaadin is an open-source Java framework that enables developers to build complete web application user interfaces entirely in Java, without writing HTML, CSS, or JavaScript directly. Its core product, Vaadin Flow, handles client-server communication automatically and generates frontend code from server-side Java logic. Key built-in features include annotation-based routing, a data Grid component with sorting and lazy loading, and a Binder class for form validation tied to data models. The server-driven architecture keeps business logic and UI state on the server, improving security but increasing memory usage per active session. For teams wanting a more reactive approach, Vaadin also offers Hilla, which pairs a Spring Boot backend with a React frontend and auto-generates type-safe TypeScript endpoints from Java services.

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