code: public ModelHandler borrowtHandlerObject(String formName) {
  		ModelHandler modelHandler = null;
  		try {
  			modelHandler = handlerObjectFactory.borrowHandlerObject(formName);
  			modelHandler.setModelMapping(modelFactory.getModelMapping(formName));
  		} catch (Exception ex) {
  			Debug.logError("[JdonFramework]can't get the modelHandler for the formName " + formName, module);
  			returnHandlerObject(modelHandler);
  		}
  		return modelHandler;
  	}
docs: borrow a Handler instance from Modelhandler pool