Versions used

Just cloned the repo as normal

Akka version: 2.6.1

The killrweather server crashes on start complaining that it can't find the split brain resolver class. you need to change the app config from downing-provider-class = "akka.cluster.sbr.SplitBrainResolverProvider" to akka.cluster.downing-provider-class = "akka.cluster.sbr.SplitBrainResolverProvider" and it will work fine.

I imagine all the other projects that rely on this property need to be updated as well.

Not as simple as I thought, I noticed I was getting this in the log No downing-provider-class configured, manual cluster downing required

It turns out undoing my change and upgrading the project to Akka 2.6.15 fixes the issue completely.