Ken Kousen presents a variety of small but non-trivial examples of Groovy in action, using techniques ranging from closures to parsers and slurpers to metaprogramming and AST transformations.
Ken Kousen teaches the fundamentals of Grails through examples: domain classes, controllers, transactional services, producing XML and JSON data, Ajax, unit and integration testing, plugins.
Peter Ledbrook shows how Groovy can be useful for writing scripts, unit tests or builds for Spring projects and how Grails simplifies web application development.
Phil Webb offers tips and code samples on how to refactor existing code for the cloud, alternatives to the file system, compiling without the JDK, dealing with gateway timeouts and how to run Tomcat 7
Ed Callahan and Derek Henninger demo building a SpringSource application with WaveMaker including web services, DB access and generating a mobile version of the app.
Mark Pollack provides a guided tour plus demos of the Spring Data feature set.
Nikita Ivanov shows adding real-time capabilities to Hadoop through a demo application streaming word counting on a 2-nodes cluster.
Mark Johnson and David Turanski introduce Spring Data for GemFire demoing using Spring Data for persistency across multiple distributed database grids.
Thomas Sundberg emphasizes the need for writing executable specifications demoing on example using Cucumber.
Gary P Russell shows an application used for managing and monitoring apps built with Spring Integration, and overviews the JMX support provided by Spring Integration.
Dustin Getz shows writing monads code explaining how they work and why they are useful.