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All Groovy & Grails Classes

Getting Started with Groovy and Grails

4 Day On-Site or 28-Hour Online Instructor Hands-On Training

This course teaches web developers how to use the Grails framework to rapidly create sophisticated web applications. Starting with a foundation of basic Java, students learn the fundamentals of the Groovy programming language. The course then discusses how Grails uses convention over configuration to build applications that rest on the foundation of the Spring Framework and the Hibernate Object­Relational Mapping API. Applications are built using a standard layered architecture, combining domain classes, controllers, and transactional services. Recent developments in the framework are also covered, including plugins, test driven development, and RESTful web services.

This course uses Grails version 2.5, but the information is applicable for versions 2.3 and 2.4 as well.

Corporate & Group Training: Call us at (888) 803-5607 to help you customize a training plan for your group.

Watch our free online training videos with instructor Ken Kousen, Ph.D.:
Groovy for Java Developers
Groovy and Grails for Banner Developers
(free registration is required).

"Ken was possibly the best instructor I've ever had."

"Ken did a great job, had a thorough understanding

and had a lot of patience for helping with anything

even if it wasn't part of the course."

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Training Objectives‚Äč: 

  • Develop model­view­controller web applications using Grails
  • Access relational databases from Grails
  • Work with existing Java classes and libraries
  • Build unit and functional tests for web applications

 Topic Summary

Groovy Review

  • Relationship between Groovy and Java
  • Operator overloading
  • Using assertions
  • Strings and Groovy Strings
  • POGOs
  • Closures
  • Ranges, Lists, Sets, and Maps
  • Basic AST transformations
  • The Groovy JDK
  • Miscellaneous operators
  • Parsing and building XML
  • Parsing and building JSON

 Grails Introduction

  • Installing Grails
  • Grails Links

 Starting a Grails project

  • Project Structure
  • Domain classes
  • Controllers
  • Services
  • i18n
  • Views
  • Interactive console
  • IDE support

 Domain Objects

  • Object­Relational Mapping with GORM
  • Transient properties
  • Constraints and validation
  • CRUD operations


  • Dynamic vs static
  • Generating controllers
  • Generating views
  • Tests


  • Accessing Controllers
  • Returning from Controller Actions
  • The params map
  • Default Action in a Controller
  • Parameter binding
  • Render, Redirect, Return
  • Respond

 Grails Object Relational Mapping (GORM)

  • Logging SQL
  • Optional Hibernate­managed Properties
  • Constraints
  • Saving to the Database

 The Hibernate Session

  • Object-­Relational mapping
  • Transient, persistent, and detached objects
  • The Open Session In View (OSIV) pattern

 GORM Relationships

  • One-­to-­Many
  • Many-­to­-Many
  • Cascade save and insert
  • Cascade delete
  • Uni­directional and bi­directional associations

 Grails Queries

  • Dynamic Finders
  • Criteria Queries
  • Where Queries


  • The need for a service layer
  • Grails and the DAO layer
  • Grails without transactions
  • Grails services


  • REST principles
  • URL mappings
  • Content negotiation
  • Hypermedia
  • REST in Grails (Grails 2.2 and earlier)
  • REST in Grails (Grails 2.3 and above)

 Plugin Review and Resources

  • Default plugins
  • Spring Security
  • Google Visualization
  • Console
  • Survey of popular plugins
  • References, online and otherwise


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