With pessimistic locking you can always get into trouble, e.g. look into the DeadlockTest unit test in JBossCache, where we should a simple deadlock scenarios. This is solved through timeouts, where one of the TXs throws a TimeoutException and rolls back. Manik has committed optimistic locking, but we won't officially release it yet in 1.2.4, only in 1.2.5. Stay tuned.
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