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kotlinlang

I think there are samples in the source code, but the docs are pretty good. What got me going was getting a 'toolkit' together for the types of things I need to do. Some things are just a question of choosing the right libs to include... alot of the libs out there are not async, so the main pitfall is knowing how to not block the event loop...

That said, look at the articles in the docs site, they have bigger examples like a store api, that shows how one could architecture microservices. I also found a pdf  vert.x from zero to (micro) hero and there are probably more...