Hey guys,
We setup a German speaking Slack group with all topics around the JVM and JVM languages. Obviously also all kinds of frameworks, as well as topics like smarthome, IOT or, you’ve guessed it, game development 
Every German speaker is welcome, I’m sorry for the rest though. (PS: You don’t need to be a native speaker though ;-)).
If you like to join, get yourself an invite: https://slackin-jvm-german.herokuapp.com/
Thanks,
Chris