Not op, but I don't think people would want to go from Ruby to Java. I was working on Java before I was a Go dev, feel, Java is too verbose. Go is so simple to start with and you don't need "frameworks" for deploying a production quality microservice.
I haven't used dropwizard, but used Spring boot extensively. While it definitely helps me move faster and write less boilerplate, it's still way too verbose relative to Golang.
And talk about the build size, time and the fact that you could generate a build and run it bare metal anywhere.
