hod.
 
 <p> Lock modes can be used to specify either optimistic or pessimistic locks.

 <p> Optimistic locks are specified using <a href="#OPTIMISTIC"><code>LockModeType.OPTIMISTIC</code></a> and <a href="#OPTIMISTIC_FORCE_INCREMENT"><code>LockModeType.OPTIMISTIC_FORCE_INCREMENT</code></a>.  The lock mode type
 values <a href="#READ"><code>LockModeType.READ</code></a> and 
 <a href="#WRITE"><code>LockModeType.WRITE</code></a> are
 synonyms of <code>OPTIMISTIC</code> and
 <code>OPTIMISTIC_FORCE_INCREMENT</co