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Groovy: dynamic scripting for Java
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Groovy in ActionGroovy in Action by Dierk Koenig
Buy new: $31.49 / Used from: $19.48
The definitive guide
The Definitive Guide to GrailsThe Definitive Guide to Grails by Graeme Rocher
Buy new: $34.19 / Used from: $1.91
The Groovy web application framework
Java Persistence with HibernateJava Persistence with Hibernate by Christian Bauer
Buy new: $37.79 / Used from: $20.00
Hibernate is an ideal companion to Groovy as prooved with the Grails framework that builds its ORM on it.
Spring in Action (In Action series)Spring in Action (In Action series) by Craig Walls
Buy used from: $5.22
Spring is an ideal companion to Groovy as prooved with the Grails framework that builds its dynamic configuration on it.
JUnit in ActionJUnit in Action by Vincent Massol
Buy new: $26.37 / Used from: $18.95
Background information for those that use Groovy for unit testing.
Java Development with AntJava Development with Ant by Erik Hatcher
Buy new: $29.67 / Used from: $2.90
Background information for those that make use of Groovy's AntBuilder and integration with the open-source Canoo WebTest.
Design Patterns: Elements of Reusable Object-Oriented SoftwareDesign Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma
Buy new: $35.93 / Used from: $20.00
The all-time classic on design patterns in software engineering. Excellent companion to Groovy in Action that refers to it in a number of places.
Project Retrospectives: A Handbook for Team ReviewsProject Retrospectives: A Handbook for Team Reviews by Norman L. Kerth
Buy new: $29.02 / Used from: $17.36
This book belongs in any list! During a retrospective you may find that you would like to do more dynamic scripting with Groovy in you next project.
The Pragmatic Programmer: From Journeyman to MasterThe Pragmatic Programmer: From Journeyman to Master by Andrew Hunt
Buy new: $32.25 / Used from: $23.46
More background in the "pragmatic" methodology and why you want to have tools like Groovy in your project.
Test Driven Development: By ExampleTest Driven Development: By Example by Kent Beck
Buy new: $42.70 / Used from: $25.00
More background information about the "test-driven" methodology, which is particularly suited when using dynamic languages such as Groovy.
Thinking in Java (4th Edition)Thinking in Java (4th Edition) by Bruce Eckel
Buy new: $44.09 / Used from: $38.00
Excellent companion to Groovy in Action for all those that seek to extend their knowledge of the underlying Java platform and standard library.
Smalltalk Best Practice PatternsSmalltalk Best Practice Patterns by Kent Beck
Buy new: $38.35 / Used from: $24.92
All-time classic for patterns in dynamic languages. Written for Smalltalk but applies to Groovy equally.
Getting Started with GrailsGetting Started with Grails by Jason Rudolph
Buy new: $22.95 / Used from: $10.00
The jump-start book to Grails, the Groovy web application framework that brings the Ruby on Rails approach to the Java platform. Also available as a free ebook.