Great idea. I'm sure many people would be interested including myself. I also would like to see kotlin coroutines with vertx APIs. They have been nicely integrated with spring 5 https://github.com/alek-sys/spring-coroutines-demo

Good work and nice write up! But the end result compared to what you'd get with Spring repositories and annotations is much more cluttered. I understand that you went down this path until Spring 5 stable is released but when that happens I don't see any reason someone would go with vertx+hibernate instead of that.