holders.remove(serverID);
holders.remove(in);
   public synchronized void checkInResourceManager(String serverID)   {      Holder h = (Holder)holders.get(serverID);            if (h == null)      {         throw new IllegalArgumentException("Cannot find resource manager for server: " + serverID);      }            h.refCount--;            if (h.refCount == 0)      {         holders.remove(serverID);      }         }