Hello.
Not sure if this project is still maintain but if anyone needs it, here is a patch for Gatling 3.4.2 compatibility :
support_for_gatling_3_4.patch.txt
I'd have created a PR but I'm not allowed to create a branch.
These modifications are NOT tested thoroughly, I've just made modification so that the project compile against Gatling 3.4.2 and tested that sending a message to a kafka queue is working (check the BaseSimulation example)
In case anyone needs the sources, I've forked this repository and push the modification to a branch named gatling-3.4 : https://github.com/arthur25000/gatling-kafka/tree/gatling-3.4