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oh well, I was about to post a question asking something like "what are your favourite resources?". Nice list, I would add this to the videos:

Thanks that's already part of the list under the

Spring One 2GX 2015

link, although it's on page 5... Ken is a very good speaker though, I also like Venkat's talks. I saw a talk similar to this one and that's when I had an aha moment: http://www.infoq.com/presentations/Transforming-to-Groovy