Programming Grails (repost)

Dig deeper into Grails architecture and discover how this application framework works its magic. Written by a core developer on the Grails team, this practical guide takes you behind the curtain to reveal the inner workings of its 2.0 feature set. You’ll learn best practices for building and deploying Grails applications, including performance, security, scaling, tuning, debugging, and monitoring.

Understand how Grails integrates with Groovy, Spring, Hibernate, and other JVM technologies, and learn how to create and use plugins to augment your application’s functionality. Once you know how Grails adds behavior by convention, you can solve problems more easily and develop applications more intuitively.
Write simpler, more powerful code with the Groovy language
Manage persistence in Grails, using Hibernate or a NoSQL datastore
Learn how Grails uses Spring’s functionality and optional modules
Discover how Hibernate handles details for storing and retrieving data
Integrate technologies for messaging, mail, creating web services, and other JEE technologies
Bypass convention and configure Grails manually
Learn a general approach to upgrading applications and plugins
Use Grails to develop and deploy IaaS and PaaS applications