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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.

Solutions on the web

via bukkit.org by Unknown author, 1 year ago
Unhandled exception executing command 'leavebattle' in plugin SuitUp v1.0
via bukkit.org by Unknown author, 2 years ago
via Stack Overflow by HcgRandon
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Unhandled exception executing command 'wtp' in plugin Needs v1.0
via Game Development by HcgRandon
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Unhandled exception executing command 'wtp' in plugin Needs v1.0
via GitHub by gdude2002
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Unhandled exception executing command 'v' in plugin VanishNoPacket v3.6.2
via GitHub by SamV522
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Unhandled exception executing command 'dbub' in plugin dBUB v1.2.2
java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)	at java.util.ArrayList$Itr.next(Unknown Source)	at me.gregroberti.SuitUp.Battle.removeSigns(Battle.java:1077)	at me.gregroberti.SuitUp.Battle.stopBattle(Battle.java:181)	at me.gregroberti.SuitUp.BattleManager.stopBattle(BattleManager.java:652)	at me.gregroberti.SuitUp.BattleManager.removePlayer(BattleManager.java:414)	at me.gregroberti.SuitUp.BattleManager.leaveBattle(BattleManager.java:768)	at me.gregroberti.SuitUp.SuitUp.onCommand(SuitUp.java:93)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)