code: protected boolean isLockLive(String nodeIdentifier) throws LockException
     {
  
        if (lockManager.isLockLive(nodeIdentifier))
        {
           return true;
        }
        else
        {
           return pendingLocks.contains(nodeIdentifier);
        }
     }
docs: Check is lock alive. That means lock must exist in LockManager storage (cache or map, etc).
  
  @param nodeIdentifier - locked node id
  @return