Odd Exception: Ticking world entities

EDIT: This is a know bug with CraftBukkit! Apparently, it is related to entities being teleported cross-world on death from a projectile, such as an arrow, snowball, or enderpearl.

Please vote/comment on the following ticket to help resolve this issue!

https://bukkit.atlassian.net/browse/BUKKIT-3222

Hey guys, I am getting this error:

Code:

2012-12-09 19:53:24 [SEVERE] net.minecraft.server.ReportedException: Exception ticking world entities
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:581)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
2012-12-09 19:53:24 [SEVERE] Caused by: java.lang.IndexOutOfBoundsException: Index: 622, Size: 599
2012-12-09 19:53:24 [SEVERE] at java.util.ArrayList.rangeCheck(ArrayList.java:571)
2012-12-09 19:53:24 [SEVERE] at java.util.ArrayList.remove(ArrayList.java:412)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1216)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
2012-12-09 19:53:24 [SEVERE] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
2012-12-09 19:53:24 [SEVERE] ... 4 more
2012-12-09 19:53:24 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.server.ReportedException: Exception ticking world entities
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.lang.IndexOutOfBoundsException: Index: 622, Size: 599
at java.util.ArrayList.rangeCheck(ArrayList.java:571)
at java.util.ArrayList.remove(ArrayList.java:412)
at net.minecraft.server.World.tickEntities(World.java:1216)
at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
... 4 more

The basic set-up I have is:

• Main world where players spawn
• A pre-existing world is picked, copied to a directory called "current_x" (x being an integer from 0-4)
• After the players on done on said world, they are all teleported back to the main world ("world") and the process goes until they have done 5 maps.
• The server restarts, and the worlds ( "current_0" - "current_4" ) are deleted, so the worlds can be moved there again.

This error is happening during step three, in which the players are all teleported back to our main world. It doesn't seem to happen after any exact number of worlds being loaded. All I can think is that somewhere entities are being deleted.​

​

Any ideas?​

 

This would be easier to diagnose if you posted some of your code.

 

There's honestly too much for one post. I was just hoping someone had experienced something like this before and knew what I was doing to cause it.

 

dark navi post any code that affects entities

Code:

[FONT=Consolas]Caused by: java.lang.IndexOutOfBoundsException: Index: 622, Size: 599[/FONT]

My current guess is that you save the world, the world tries to save, entities despawn, saving code tries getting that entity in a for-loop

 

The stack trace points to somewhere within the server, not my plugin. =/

Code:

java.lang.IndexOutOfBoundsException: Index: 810, Size: 802
    at java.util.ArrayList.rangeCheck(ArrayList.java:571)
    at java.util.ArrayList.remove(ArrayList.java:412)
    at net.minecraft.server.World.tickEntities(World.java:1216)
    at net.minecraft.server.WorldServer.tickEntities(WorldServer.java:444)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:577)
    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)

Any ideas?

 

The fact that it points towards the server source, does not mean your plugin was the trigger. Looks like some code is needed

 

The line it throws the error on is when it loops through entities and removes dead ones. Obviously it is looping through while the number of entities is being modified. I guess I'll make sure I'm not doing any async things with entities.

 

don't do any bukkit or minecraft things with async...

 

Are you using asynchronous scheduled tasks or other threads? If you're not, are there any other plugins on your server which are? (Test your plugin on a server with no other plugins installed)

 

This may be a bit late, but I recently discovered this bug.

https://bukkit.atlassian.net/browse/BUKKIT-3222

can happen whenever entities die, and players can tp between worlds.

 

Thanks! Hopefully this will be resolved.

 

Hopefully, but make sure you upvote the problem or make a comment to let them know that it's not just one person. The more people that it affects the more likely they are to fix!

 

"Hopefully"

 

If anyone else is experiencing this issue, PLEASE vote on the bug that alkarin posted. I'll edit the main post.