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Grails

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description Grails Overview

Grails is an open-source Java web application framework built on Groovy that simplifies development by providing conventions and integrations for common tasks like database access and RESTful API creation.

help Grails FAQ

Is Grails a Java framework or a Groovy framework?

Grails applications are primarily written in Groovy but run on the Java Virtual Machine. They can call Java libraries directly and use major Java ecosystem components such as Spring and Hibernate.

How does Grails simplify database access?

Grails provides GORM, which lets developers define domain classes and use dynamic methods for common database operations. Hibernate has historically been a major GORM implementation, while other GORM variants support additional data stores.

Is Grails related to Ruby on Rails?

Grails adopted ideas such as convention over configuration, scaffolding, and command-line project generation that were popularized by Ruby on Rails. It differs by using Groovy, the JVM, Spring, and Java-compatible deployment.

Can Grails build REST APIs as well as server-rendered websites?

Yes. Grails supports REST controllers, URL mappings, JSON rendering, and domain-resource endpoints. It can also render server-side views using GSP, the Grails Server Pages templating system.

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