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  1. ,
    via 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 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 Mike Rother
, 5 months ago
This exception has no message.
via GitHub by hideki
, 11 months ago
This exception has no message.
via Stack Overflow by Siespi
, 4 months ago
This exception has no message.
via Mojang JIRA by [Bot] Hopper, 2 years ago
java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification( at java.util.ArrayList$ at java.util.Collections$UnmodifiableCollection$ at org.hibernate.engine.spi.ActionQueue.executeActions( at org.hibernate.engine.spi.ActionQueue.executeActions( at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions( at org.hibernate.event.internal.DefaultFlushEventListener.onFlush( at org.hibernate.internal.SessionImpl.flush(