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  1. ArrayList$Itr.next() has thrown a ConcurrentModificationException
    Java Runtime
    190
    577
    29
  2. Multiple threads trying to modify ArrayList at the same time or trying to modify ArrayList while iterating over it
    Java Runtime
    208
    626
    30

Your stack trace compared to the selected pattern

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java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at net.minecraft.server.v1_9_R2.World.a(World.java:2549)
    at net.minecraft.server.v1_9_R2.SpawnerCreature.a(SpawnerCreature.java:120)
6 frames hidden

Solution

chinthana11 months ago

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.

Check the source of this solution for more info

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