Past Meetup

Reactive Streams & Akka HTTP: Connect to the World

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After a long rest, this meetup group is finally going to wake up with a BANG!

Join us on December 10th when Mathias Doenitz (@sirthias (, creator of Spray (, will be talking about reactive streams (, akka-streams, and akka-http, the successor to Spray.


If you want to provide or consume HTTP-based APIs with Scala or Java then this talk is for you: Akka HTTP takes reactive high-performance web interactions to the next level. Fully asynchronous and non-blocking, a type-safe and very powerful declarative API, an immutable HTTP model without compromises, all these are perfectly fitted to the Actor world.

Among many smaller improvements over its predecessor library, akka-http comes with one major advantage: it is based on a new abstraction called "Reactive Streams” which provides a number of important benefits, not only for working with HTTP.

In this session we’ll first take a closer look into the reactive streams effort, the problems it solves and what programming with reactive streams looks like.

After a short break we’ll then turn to akka-http, how it is used, what improvements it brings over spray and why you will not want to use anything else after having tried it.

And of course I'll share the latest roadmap up until making akka-http the new "driver" layer for the Play framework.


• 18:00 - 19:00: doors open and food

• 19:00 - 19:45: Part I: reactive streams & akka-streams

• 19:45 - 20:00: break

• 20:00 - 20:45: Part II: akka-http and the future of Spray

Xebia will be taking care of the food and drinks while Rockstart, in the shape of Elmar from Cupenya (, is very kindly letting us use their ballroom.