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  1. ,
    via javacodegeeks.com by Unknown author

    Causes : The Collection is internally modified, while a thread is iterating over it. OR after the creation of an iterator, the Collection is internally modified by any method other than the iterator’s own methods for removal and addition.

  2. ,
    via oracle.com by Unknown author

    In order to avoid more than one threads accessing or modifying the same object, you can synchronize them over the object, in order to allow only one thread to manipulate it over time.

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via GitHub by DraksterAU
, 1 year ago
This exception has no message.
via GitHub by vedarthk
, 2 months ago
via Google Groups by Vedarth Kulkarni, 2 months ago
via GitHub by jromero
, 11 months ago
This exception has no message.
via Stack Overflow by Jan Štefánik
, 1 year ago
This exception has no message.
via Stack Overflow by user9337706
, 2 weeks ago
java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)	at java.util.ArrayList$Itr.next(ArrayList.java:851)	at thermos.chaud.HashedArrayList$HashedArrayIterator.next(HashedArrayList.java:215)	at com.stargatemc.mod.providers.npcs.npcRegistry.clearUnregistered(npcRegistry.java:141)	at com.stargatemc.mod.providers.npcs.npcRegistry.tickNPCs(npcRegistry.java:130)	at com.stargatemc.mod.StargateMCMod.onWorldTick(StargateMCMod.java:110)	at cpw.mods.fml.common.eventhandler.ASMEventHandler_131_StargateMCMod_onWorldTick_WorldTickEvent.invoke(.dynamic)	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)	at cpw.mods.fml.common.FMLCommonHandler.onPreWorldTick(FMLCommonHandler.java:273)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:957)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693)	at java.lang.Thread.run(Thread.java:745)