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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 GitHub by Bysokar
, 1 year ago
Plugin SRPG v1.0.0 generated an exception while executing task 188
via GitHub by Ben12345rocks
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via GitHub by Eufranio
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Plugin VotingPlugin v5.5.1 generated an exception while executing task 241
via GitHub by Eufranio
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Plugin VotingPlugin v5.5.1 generated an exception while executing task 57
via GitHub by Eufranio
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Plugin VotingPlugin v5.5.2 generated an exception while executing task 2689
via GitHub by Time6628
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Plugin BuycraftX v10.0 generated an exception while executing task 34270
java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)	at java.util.ArrayList$Itr.next(ArrayList.java:851)	at com.stargatemc.srpg.tasks.events.jaffaAttackEarthEvent.run(jaffaAttackEarthEvent.java:85)	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71)	at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)