I have a BlockPopulator that calls World.generateTree. The server hangs on the call, kicking players with a timeout error and then eventually displaying this in the console:
Deadlock From World.generateTree in BlockPopulator
[22:06:34] [Spigot Watchdog Thread/ERROR]: Spigot version: git-Spigot-0c02b0c-e879c44 (MC: 1.14)
[22:06:34] [Spigot Watchdog Thread/ERROR]: ------------------------------
[22:06:34] [Spigot Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):
[22:06:34] [Spigot...
[22:06:34] [Spigot Watchdog Thread/ERROR]: ------------------------------
[22:06:34] [Spigot Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):
[22:06:34] [Spigot...
Deadlock From World.generateTree in BlockPopulator