High-speed development and maintenance of web applications using pure Java; clear separation of UI design and logical processing; long-term protection of investments in software development, free of charge
A system to develop a SPA on the server; have known only the development with Vaadin until the first test of CaptainCasa. However, I had problems scaling with Vaadin; this system works better. Like the separation of the backend and design development.
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
Grails - An Open Source, full stack, web application framework for the JVM
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
jHipster - JHipster is a development platform to quickly generate, develop, & deploy modern web applications & microservice architectures.
Apache Struts - Apache Struts is an open-source web application framework for developing Java EE web applications.