We are running into some technical issues while performing the jgrapht 1.4.1 release, primarily caused by the upgrade from java 8 to java 11. It seems we will need some more time to iron out these kinks. For now, go ahead with merging new content/fixes/etc into the master branch. I will send out another email when we are confident that the release can proceed as planned.
Also, since the upgrade from java 8 to 11 is a rather big milestone and not just a small maintenance issue, we will skip version number 1.4.1 and immediately jump to 1.5.0
Joris Kinable