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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 Sakai JIRA by Tim Donohue, 1 year ago
via Sakai JIRA by Tim Donohue, 2 years ago
via Stack Overflow by Heat Death
, 2 years ago
This exception has no message.
via Stack Overflow by Sam
, 2 years ago
via GitHub by voidchar
, 1 year ago
This exception has no message.
java.util.ConcurrentModificationException: 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)	at java.util.ArrayList$Itr.next(ArrayList.java:831)	at org.hibernate.collection.internal.AbstractPersistentCollection$IteratorProxy.next(AbstractPersistentCollection.java:810)	at org.dspace.content.packager.RoleIngester.ingestDocument(RoleIngester.java:263)	at org.dspace.content.packager.RoleIngester.ingest(RoleIngester.java:492)	at org.dspace.content.crosswalk.RoleCrosswalk.ingest(RoleCrosswalk.java:336)	at org.dspace.content.crosswalk.RoleCrosswalk.ingest(RoleCrosswalk.java:258)	at org.dspace.content.packager.METSManifest.crosswalkXmd(METSManifest.java:1193)	at org.dspace.content.packager.METSManifest.crosswalkObjectOtherAdminMD(METSManifest.java:1106)	at org.dspace.content.packager.AbstractMETSIngester.replaceObject(AbstractMETSIngester.java:650)	at org.dspace.content.packager.AbstractMETSIngester.replace(AbstractMETSIngester.java:1207)	at org.dspace.content.packager.AbstractPackageIngester.replaceAll(AbstractPackageIngester.java:282)	at org.dspace.app.packager.Packager.replace(Packager.java:737)	at org.dspace.app.packager.Packager.main(Packager.java:377)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:227)	at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:79)