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Concurrent Modification Exception


willez

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I've been experiencing this exception many times, when my entity dies, or it checks for nearby entities using worldObj.getEntitiesWithinAABB or even when trying to move using moveEntity(motionX, motionY, motionZ),....

2012-08-23 15:53:07 [iNFO] [sTDERR] java.util.ConcurrentModificationException
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at java.util.ArrayList$Itr.next(Unknown Source)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.Chunk.getEntitiesWithinAABBForEntity(Chunk.java:1073)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.World.getEntitiesWithinAABBExcludingEntity(World.java:3337)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.World.getCollidingBoundingBoxes(World.java:1461)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.Entity.moveEntity(Entity.java:657)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at willez.minegicka.Spray.onUpdate(Spray.java:75)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at willez.minegicka.SprayWater.onUpdate(SprayWater.java:41)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.World.updateEntityWithOptionalForce(World.java:2021)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.WorldServer.updateEntityWithOptionalForce(WorldServer.java:538)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.World.updateEntity(World.java:1986)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.World.updateEntities(World.java:1867)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.WorldServer.updateEntities(WorldServer.java:437)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:616)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:547)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.IntegratedServer.tick(IntegratedServer.java:102)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:453)
2012-08-23 15:53:07 [iNFO] [sTDERR] 	at net.minecraft.src.ThreadServerApplication.run(ThreadServerApplication.java:17)

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If you're willing zip up your source and send it to me so I can do some testing.

I cant seem to figure out why this is happening as the two threads that deal with the entity list deal with different chunk instances.

So having a mod that can reproduce this and figure out exactly what causes this. If it is indeed Forge, or if its user error.

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
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Found the issue, you're spawning entities on the server, using the client thread.

You need to edit your tick handler to use the server ticks.

Aside form that you really need to re-design your mod for the clear separation of client and server, else you're gunna be doomed to be a old outdated single player only mod forever.

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
Consider supporting the team on Patreon

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