code: @Override
      public IEntityLock[] findUnexpired(
              Date expiration, Class entityType, String entityKey, Integer lockType, String lockOwner)
              throws LockingException {
          Timestamp ts = new Timestamp(expiration.getTime());
          return selectUnexpired(ts, entityType, entityKey, lockType, lockOwner);
      }
docs: Retrieve IEntityLocks from the underlying store. Expiration must not be null.
  
  @param expiration Date
  @param entityType Class
  @param entityKey String
  @param lockType Integer - so we can accept a null value.
  @param lockOwner String
  @exception LockingException - wraps an Exception specific to the store.