If you are considering Vaadin, you may also want to investigate similar alternatives or competitors to find the best solution. Other important factors to consider when researching alternatives to Vaadin include communication. The best overall Vaadin alternative is spring.io. Other similar apps like Vaadin are JHipster, Jmix, Apache Wicket, and Eclipse RAP. Vaadin alternatives can be found in Java Web Frameworks but may also be in JavaScript Web Frameworks.
The Spring Framework is an application framework and inversion of control container for the Java platform.
JHipster is a development platform to generate, develop and deploy Spring Boot + Angular Web applications and Spring microservices.
Jmix is a high level framework for the rapid development of enterprise applications with rich web interfaces. The platform abstracts developers from underlying technologies so they can focus on the business tasks, whilst retaining full flexibility by providing unrestricted access to low level code.
RAP provides a powerful widget toolkit and integrates well with proven technologies such as OSGi and JEE. You can write your application entirely in Java, re-use code and benefit from first-class IDE tools.
Apache Struts is a free, open-source, MVC framework for creating elegant, modern Java web applications. It favors convention over configuration, is extensible using a plugin architecture, and ships with plugins to support REST, AJAX and JSON.
Spark - A micro framework for creating web applications in Java 8 with minimal effort
The High Velocity Web Framework For Java and Scala
A powerful Groovy-based web application framework for the JVM
The JavaScript App Platform