(Quick Reference)

1. Introduction - Reference Documentation

Authors: Graeme Rocher, Peter Ledbrook, Marc Palmer, Jeff Brown, Luke Daley, Burt Beckwith

Version: 1.3.7

1. Introduction

Java web development as it stands today is dramatically more complicated than it needs to be. Most modern web frameworks in the Java space are over complicated and don't embrace the Don't Repeat Yourself (DRY) principles.

Dynamic frameworks like Rails, Django and TurboGears helped pave the way to a more modern way of thinking about web applications. Grails builds on these concepts and dramatically reduces the complexity of building web applications on the Java platform. What makes it different, however, is that it does so by building on already established Java technology like Spring & Hibernate.

Grails is a full stack framework and attempts to solve as many pieces of the web development puzzle through the core technology and it's associated plug-ins. Included out the box are things like:

  • An easy to use Object Relational Mapping (ORM) layer built on Hibernate
  • An expressive view technology called Groovy Server Pages (GSP)
  • A controller layer built on Spring MVC
  • A command line scripting environment built on the Groovy-powered Gant
  • An embedded Tomcat container which is configured for on the fly reloading
  • Dependency injection with the inbuilt Spring container
  • Support for internationalization (i18n) built on Spring's core MessageSource concept
  • A transactional service layer built on Spring's transaction abstraction

All of these are made easy to use through the power of the Groovy language and the extensive use of Domain Specific Languages (DSLs)

This documentation will take you through getting started with Grails and building web applications with the Grails framework.