Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
eaf05a2a Expand Recipe API to allow multiple Materials per slot
CraftBukkit Changes:
4c219e2a Expand Recipe API to allow multiple Materials per slot
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
f7662d5c SPIGOT-4283: Allow setting recipe groups
CraftBukkit Changes:
bfb91314 SPIGOT-4283: Allow setting recipe groups
Any plugin still using this API will result in the server saving an inconsistent UUID to player data files,
which then triggers warnings such as "Tried to load unrecognized recipe: bukkit:9e5b92f5-e549-4f47-b0a8-9f89390ed77b removed now."
on the players login.
Plugin authors need to define a key to keep it consistent between server restarts.