I just tracked this in the code - there seems to be no bug in this area. 
Threadsafe access to the keyset is garanteed by a ReadLock on the Node.

The Concurrentmodificationexception should only be thrown, if 
'getChildrenNames()' and the iteration over the keySet are not done within the 
same transaction.

Access to the keySet outside of a transaction is not garanteed to be threadsafe.

Can you please check out whether this still happens with 
TransactionIsolationLever being set higher than 'NONE'?

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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3856661#3856661

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