Ticking entity main thread freeze.

I keep getting this error

Code:

2012-11-23 15:33:33 [SEVERE] net.minecraft.server.ReportedException: Ticking entity
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:581)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
2012-11-23 15:33:33 [SEVERE] Caused by: java.util.ConcurrentModificationException
2012-11-23 15:33:33 [SEVERE]    at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
2012-11-23 15:33:33 [SEVERE]    at java.util.HashMap$KeyIterator.next(Unknown Source)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.EntityTracker.a(EntityTracker.java:189)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.EntityPlayer.j_(EntityPlayer.java:185)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.World.entityJoinedWorld(World.java:1333)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:546)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.World.playerJoinedWorld(World.java:1315)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.World.tickEntities(World.java:1193)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
2012-11-23 15:33:33 [SEVERE]    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
2012-11-23 15:33:33 [SEVERE]    ... 4 more
2012-11-23 15:33:33 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.ReportedException: Ticking entity
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:581)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
    at java.util.HashMap$KeyIterator.next(Unknown Source)
    at net.minecraft.server.EntityTracker.a(EntityTracker.java:189)
    at net.minecraft.server.EntityPlayer.j_(EntityPlayer.java:185)
    at net.minecraft.server.World.entityJoinedWorld(World.java:1333)
    at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:546)
    at net.minecraft.server.World.playerJoinedWorld(World.java:1315)
    at net.minecraft.server.World.tickEntities(World.java:1193)
    at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
    ... 4 more
2012-11-23 15:33:33 [SEVERE] This crash report has been saved to: /home/server2866/./crash-reports/crash-2012-11-23_15.33.33-server.txt

Server is still responsive through console ect, just players cant connect and are disconnected due to the main thread being frozen.


The only ones that I think deal with entities would be mobarena, and maybe magic spells. The version of MobArena im using has absolutely no async tasks in it (I searched with the grep feature of eclipse). Does anyone know why im still getting these errors when there are no async tasks? Or is there some tasks that are by default async that mob arena calls? I have been talking to the dev and he doesnt know what is causing it either.

desht helped me with this before but it was still never resolved. http://forums.bukkit.org/threads/errors.112592/#post-1428064

garbagemule

 

Can we have the
2012-11-23 15:33:33 [SEVERE] This crash report has been saved to: /home/server2866/./crash-reports/crash-2012-11-23_15.33.33-server.txt

 

Sorry about that here it is, http://pastebin.com/yRGDAsCR

 

Hmm, looks like a bukkit bug, idk though. https://bukkit.atlassian.net/browse/BUKKIT-3222

 

It has been happening for a while, since the start of 1.4 when my server re-opened. People say its an async thing here http://forums.bukkit.org/threads/errors.112592/#post-1428064 but I have no async that I know of so its strange. You would think that if its a bukkit bug more people would be experiencing it, and it happens to me at least 1 time every 24 hours.

 

MobArena has no async calls, so it could very easily be a Bukkit issue. Just because people don't experience the issue on their servers doesn't mean it can't be a problem in (Craft)Bukkit - if a certain part of the API is broken, and a server only uses plugins that doesn't use that part of the API, then that server will never experience the issue. If it's the killing/removing of entities that's the problem, then chances are there's a part of the API that doesn't guard entity iteration + removal. At least that seems to be the issue - an entity collection is being modified during an iteration.

jjacobson - The exact event at which the issue happens could be very useful. When an arena ends/starts, when a player dies, when a mob or boss dies, etc.

 

Hello there, I seem to be getting the same error as you, so I might as well help this thread by comparing what plugins we have in common: PlugMan, WorldEdit, TagAPI, NoCheatPlus, Vault, PermissionsEx, WorldGuard, AutoMessage, MagicSpells, Essentials, and EssentialsSpawn. The weird thing is it seems to have to do with an entity, and the only plugins we have in common that deal with entities are TagAPI and MagicSpells, really. I will compare this with other threads to look?

 

Many plugins can cause this not just those, and this thread is like 3 months old. I would start a new one because your problem is probably not related at all.

 

jjacobson Locked at request