Qi4j/qi4j-sdk — pull request #11 by arvidhuss (2013-03-11 06:38:35+00:00)
Title: Introduced lock functionality to ConcurrentModificationCheckConcern

We experienced simultaneous entity updates on the same entity from different clients hence different Uow's, because ConcurrentModificationCheck Concern had no read/write lock.
The ordinary lock concerns kick in far to late to prevent entity state version korruption.