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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 Stack Overflow by jetp250
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Plugin MagicWands v1.0 generated an exception while executing task 247
via GitHub by ProgrammingAtDawn
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Plugin ExpBank v3.0.5.0 generated an exception while executing task 2410
via GitHub by sgrayme
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Plugin FirstJoinPlus v2.4 generated an exception while executing task 37
via GitHub by mibby
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Plugin ChestShopNotifier v1.1.5 generated an exception while executing task 221
via GitHub by mibby
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Plugin ChestShopNotifier v1.1.5 generated an exception while executing task 150
via GitHub by SotrForgotten
, 8 months ago
Plugin Residence v4.1.5.1 generated an exception while executing task 99320
java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)	at java.util.ArrayList$Itr.next(Unknown Source)	at io.jettymc.DataHolders.ProjectileManager.iterate(ProjectileManager.java:117)	at io.jettymc.DataHolders.ProjectileManager$1.run(ProjectileManager.java:232)	at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:58)	at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)	at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)