Comment by threeseed

If you're missing Go-like channels, actors etc then check out Quasar with can be integrated with Dropwizard using a library called Comsat.

It's pretty cool to take an existing Dropwizard app, change a couple of lines and every request becomes a lightweight fiber:

http://docs.paralleluniverse.co/comsat/

http://docs.paralleluniverse.co/quasar/