Rob Fletcher explains how to use Vert.x, WebSockets, continuous unit testing and headless end-to-end testing to create one-page applications in Grails.
Marco Vermeulen showcases using BDD and Cucumber to develop GVM, an open source tool for managing parallel SDK versions.
Jeff Scott Brown explains how to write polyglot applications with Grails, focusing on what it takes to add support for Scala, Clojure and other languages.
Jeff Beck shows how to use Codenarc, Cobertura, JSLint, and other tools to perform static analysis on Grails applications.
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.