If you'd like to give it a try (and we strongly encourage you to push your own boundaries) please bring whatever you need for a 5(ish) min talk. You don't need slides if you don't want to use them. All you really need is just you!
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Peter is a long time Java developer and one of the core Grails committers. He has been developing with Grails since version 0.2 (give or take 0.1). He created the GWT Grails plugin as an exercise to see whether it was possible, but it has since grown into something that can support serious development.