code: public void save(T object, DynamoDBSaveExpression saveExpression) {
          mapper.<T>save(object, saveExpression);
      }
docs: Saves the object given into DynamoDB using the specified saveExpression.
  @param object The object to save.
  @param saveExpression The save expression.
  @see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper#save