When a player leaves the server, I sometimes see this error in the console:

[21:42:41] [Server thread/WARN]: java.lang.NoSuchMethodException: java.util.Arrays$ArrayList.<init>() [21:42:41] [Server thread/WARN]: at java.base/java.lang.Class.getConstructor0(Class.java:3517) [21:42:41] [Server thread/WARN]: at java.base/java.lang.Class.getConstructor(Class.java:2238) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.wrappers.BukkitConverters.getGenericList(BukkitConverters.java:277) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.wrappers.BukkitConverters.access$100(BukkitConverters.java:88) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.wrappers.BukkitConverters$3.getGeneric(BukkitConverters.java:367) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.wrappers.BukkitConverters$3.getGeneric(BukkitConverters.java:359) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.wrappers.Converters$1.getGeneric(Converters.java:48) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.reflect.StructureModifier.writeInternal(StructureModifier.java:372) [21:42:41] [Server thread/WARN]: at ProtocolLib.jar//com.comphenix.protocol.reflect.StructureModifier.write(StructureModifier.java:345) [21:42:41] [Server thread/WARN]: at com.nickuc.login.ΣιυΦΨΩξχΨο.h(:100) [21:42:41] [Server thread/WARN]: at com.nickuc.login.βθσπψλΓωυΨλω.h(:79) [21:42:41] [Server thread/WARN]: at com.nickuc.login.ωΛΛτεηΛΣςκγΛΨΦ.a(:293) [21:42:41] [Server thread/WARN]: at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor42.execute(Unknown Source) [21:42:41] [Server thread/WARN]: at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) [21:42:41] [Server thread/WARN]: at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) [21:42:41] [Server thread/WARN]: at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) [21:42:41] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:630) [21:42:41] [Server thread/WARN]: at net.minecraft.server.players.PlayerList.disconnect(PlayerList.java:607) [21:42:41] [Server thread/WARN]: at net.minecraft.server.players.PlayerList.disconnect(PlayerList.java:592) [21:42:41] [Server thread/WARN]: at net.minecraft.server.network.PlayerConnection.onDisconnect(PlayerConnection.java:1962) [21:42:41] [Server thread/WARN]: at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1942) [21:42:41] [Server thread/WARN]: at net.minecraft.network.NetworkManager.handleDisconnection(NetworkManager.java:743) [21:42:41] [Server thread/WARN]: at net.minecraft.server.network.ServerConnection.c(ServerConnection.java:221) [21:42:41] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1648) [21:42:41] [Server thread/WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:490) [21:42:41] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1475) [21:42:41] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1274) [21:42:41] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) [21:42:41] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:831)

Plugin version: 4.7.0

This can safely be ignored. The error message was silenced in a dev build: https://ci.dmulloy2.net/job/ProtocolLib/