[Crash] ReflectionException: Could not find class: net.minecraft.server.level.EntityPlayer

[kangobot]

Auto-reported crash

Key	Value
Plugin	ChatControl 12.1.8
Server	Paper 1.20.6-R0.1-SNAPSHOT
Players Online	0
BBB Nonce	b14ef3f4fefbd4ea905d4294a987575e
db_type	local
db_player_type	uuid
proxy_enabled	false

Context

Failed to find EntityPlayer.playerConnection

Stack Trace

ReflectionException: Could not find class: net.minecraft.server.level.EntityPlayer
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.ReflectionUtil.lookupClass(ReflectionUtil.java:568)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.remain.Remain.getNMSClass(Remain.java:3440)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.remain.Remain.<clinit>(Remain.java:449)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.platform.BukkitPlatform.runTaskAsync(BukkitPlatform.java:682)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.platform.Platform.runTaskAsync(Platform.java:330)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.platform.BukkitPlatform.isPluginInstalled(BukkitPlatform.java:623)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.platform.Platform.isPluginInstalled(Platform.java:252)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.model.HookManager.loadDependencies(HookManager.java:183)
	at ChatControl-12.1.8.jar//org.mineacademy.chatcontrol.lib.platform.BukkitPlugin.onEnable(BukkitPlugin.java:372)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288)
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202)
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520)
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:626)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:575)
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:675)
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437)
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323)
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1136)
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323)
	at java.base/java.lang.Thread.run(Thread.java:1583)

[kangarko]

Fixed for the next build. This is a framework-level issue: Paper switched to a Mojang-mapped runtime in 1.20.5, but the code that locates the player connection field and the packet send method only used the new class names from 1.21 onward. On 1.20.5 and 1.20.6 it fell back to the old Spigot names and failed at startup. It now keys off actual Mojang-mapping detection, so it resolves correctly on 1.20.5+.