Stephane Maldini on addressing several issues concerning web applications written with Grails: scrolling large data sets without blocking, streaming to the browser, scale Grails in the cloud, etc.
Marco Vermeulen explains using Cucumber and Groovy to apply BDD to a project, using Gherkin for writing scenarios, Groovy for step definitions, Spock for new features, and running Cucumber features.
Dan Woods presents the strengths and flexibility in Groovy, including its dynamic nature, categories and mixins, to create a powerful, maintainable, and simple application architecture.
Burt Beckwith discusses performing transactions in Grails, covering services, customizing transaction attributes (isolation, propagation levels), two-phase commit, using JMS, and testing the code.
Paul King illustrates various DSLs written in Groovy, highlighting several logic solving APIs and looks at the pros and cons of the various approaches (including tool support, flexibility, lock-in).
Ken Kousen presents advanced tips and tricks for Groovy developers.
Guillaume Laforge and Paul King show how to leverage Groovy to build a Mars rover controlling DSL, including metaprogramming techniques and integration mechanisms.
Peter Ledbrook overviews several application architectures that can be done in Grails: MVC plus a DB back-end and a service layer, single-page, and event-based back-end.
Luke Daley introduces Ratpack, a micro web framework inspired by Ruby's Sinatra, built on Netty, Guice and Guava.
Burt Beckwith discusses the security risks web applications may face (XSS, CRSF, SQL injection) and the libraries and plugins that developers can use to secure their Grails applications.