It was over a year ago... IIRC, it was the final modifier on ContentFeatureStore.addFeatures. I actually remember visiting the GitHub page and seeing that the top commit fixed my problem on master. Sadly, I had to make it go with a release version that day/week:(Darn, I am trying to kill AbstractDataStore classes. Would of loved to know what permissions were getting in your way. The geotools-devel list here is for exactly these kind of questions.
I'll see if we can spend a few minutes and switch over to Content** implementations, but it might take a little while.
Awesome; I think I had run across another schedule/release info which didn't have 12.x on it.Anyhow, is a back-port to the 11.x series possible? In reality, that likely only matters if the 11.3 release will come before the 12.0 release...
The release schedule is available: https://github.com/geoserver/geoserver/wiki/Release-Schedule