problem with multi-thread-access

Code:

2012-01-06 19:24:09 [WARNING] Could not properly handle event PLAYER_QUIT:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: java.util.concurrent.ThreadPoolExecutor$Worker
    at org.bukkit.event.player.PlayerListener.onPlayerQuit(PlayerListener:0)
    at org.bukkit.plugin.java.JavaPluginLoader$2.execute(JavaPluginLoader.java:272)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:339)
    at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.java:161)
    at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:128)
    at org.bukkit.craftbukkit.entity.CraftPlayer.kickPlayer(CraftPlayer.java:185)
    at be.Balor.Manager.Commands.Player.KickPlayer.execute(KickPlayer.java:67)
    at be.Balor.Manager.Commands.ACCommandContainer.execute(ACCommandContainer.java:62)
    at be.Balor.Manager.CommandManager$NormalCommand.run(CommandManager.java:408)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
2012-01-06 19:24:09 [INFO] This error is logged only once: it could have occurred multiple times by now.
2012-01-06 19:24:09 [WARNING] Could not properly handle event ITEM_SPAWN:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: java.util.concurrent.ThreadPoolExecutor$Worker
    at org.bukkit.event.entity.EntityListener.onItemSpawn(EntityListener:0)
    at org.bukkit.plugin.java.JavaPluginLoader$73.execute(JavaPluginLoader.java:774)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:339)
    at org.bukkit.craftbukkit.event.CraftEventFactory.callItemSpawnEvent(CraftEventFactory.java:285)
    at net.minecraft.server.World.addEntity(World.java:889)
    at net.minecraft.server.World.addEntity(World.java:860)
    at net.minecraft.server.EntityHuman.a(EntityHuman.java:446)
    at net.minecraft.server.EntityHuman.a(EntityHuman.java:440)
    at net.minecraft.server.EntityHuman.b(EntityHuman.java:396)
    at net.minecraft.server.Container.a(Container.java:216)
    at net.minecraft.server.ContainerPlayer.a(ContainerPlayer.java:60)
    at net.minecraft.server.EntityHuman.die(EntityHuman.java:864)
    at net.minecraft.server.World.kill(World.java:934)
    at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.java:165)
    at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:128)
    at org.bukkit.craftbukkit.entity.CraftPlayer.kickPlayer(CraftPlayer.java:185)
    at be.Balor.Manager.Commands.Player.KickPlayer.execute(KickPlayer.java:67)
    at be.Balor.Manager.Commands.ACCommandContainer.execute(ACCommandContainer.java:62)
    at be.Balor.Manager.CommandManager$NormalCommand.run(CommandManager.java:408)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
2012-01-06 19:24:09 [INFO] This error is logged only once: it could have occurred multiple times by now.

This it the error in the console, but i cannot find, with plugin or what is causing these errors, is someone here knowing that?

 

#push

 

Please fill this out and post it back here:
http://forums.bukkit.org/threads/you-need-help-we-need-this-information-to-help-you.2018/

Thanks

 

I know why, minecraft doesn't have compatibiliy for a multi threaded server (yet)