Grails - A Powerful Groovy-Based Web application framework for the JVM built on top of Spring Boot

Grails is a web framework, for the JVM, built on top of Spring Boot. It leverages many features such as Spring-Powered dependency injection. It seamlessly and transparently integrates and interoperates with Java, the JVM, and existing Java EE containers.

The async features of Grails aim to simplify concurrent programming. Grails' features include the concept of Promises, a unified event model, and the use of RxJava to write reactive logic. With the use of application profiles, Grails allows you to build modern web applications. There are profiles to facilitate the construction of REST APIs or Web applications with a Javascript frontend.