public void putModel(BiopolisModel model)
     throws BiopolisActiveException, SQLException, BiopolisGeneralException,
         BiopolisActiveException, BiopolisModelStructureException {
   if (this.isInitialized()) {
     throw new BiopolisActiveException();
   }
   BiopolisSortedModel smodel = new BiopolisSortedModel(model);
   String json = new Gson().toJson(model, BiopolisModel.class);
   this.alterSystem(smodel.asDiff(), json, false);
 }