Problem solved. The error handling in this case could not be accomplished by 
catching EntityExistsException, since PersistenceExceptions except for 
NoResultException and NonUniqueException mark the transaction for rollback, 
causing it to be unavailable for the next iteration of addRootItem(). The 
existence check had to come first and, if it doesn't exist, 
Query.getSingleResult() throws NoResultException, which can then be handled 
properly because it does not cause a transaction rollback.

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