What is Grails?

Grails is a framework used to build web applications with the Groovy programming language. The core framework is very extensible and there are numerous plugins available that provide easy integration of add-on features.

Flat Learning Curve

Convention-over-configuration, sensible defaults, opinionated APIs, and the Groovy language combine to make Grails easy to learn for Java developers.
Spring Boot

On top of Spring Boot

Grails is built on top of Spring Boot and leverages Spring Boot’s time-saving features, such as Spring-powered dependency injection.

Smooth Java Integration

Grails seamlessly and transparently integrates and interoperates with Java, the JVM, and existing Java EE containers.
Groovy Programming Language


Apache Groovy is a language for the Java platform designed to enhance developers’ productivity. It is an optionally-typed and dynamic language but with static-typing and static compilation capabilities.

Seamless GORM Integration

Grails seamlessly integrates with GORM, a data access toolkit that provides a rich set of APIs for accessing relational and non-relational data. GORM also includes implementations for Hibernate (SQL), MongoDB, Cassandra, and Neo4j.


With the use of application profiles, including React and Angular, Grails allows developers to build REST APIs or modern web applications with a JavaScript frontend.


Developers can build plugins that extend and enhance Grails, or they can access existing plugins published by a vibrant plugin community.

View Technologies

Technologies such as GSP, JSON Views, and Markup Views help developers effortlessly generate HTML, JSON and XML.

Asynchronous Capabilities

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.

Open Source

Grails is an Open Source Apache 2 License project.

Domain-Specific Languages

Grails relies on expressive domain-specific languages (DSLs) for validation, querying, markup rendering, and more.

IDE Support

Developers can access support at any time via IDEs and text editors, such as Intellij IDEA, Eclipse, Sublime, and Textmate.