Vaadin é um framework Java do lado do servidor para criar interfaces de usuário, é a maneira mais fácil de criar interfaces de usuário que permite roteamento e mapeamento fáceis com os modelos de backend Java e objetos de transferência de dados.

I like that Vaadin is simple to use, has really aproachable customer support and is suitable for migration from Java Swing or JavaFX and especially when integrated with Java Spring (Boot). What I like the most is that Vaadin is easy to use by developers. The good thing is that developers are not forced to learn JavaScript, several JavaScript libraries (jQuery, AngularJS etc.), web techniques (AJAX, sessions, cookies, browser-specific handling), protocols (WebSockets) because Vaadin takes care of this.

Simple to use, customer support and really good if u got all java devs.