MyBatis не хочет мапить вложенные друг в друга модели (relationship mapping)

CREATE DATABASE  IF NOT EXISTS `carwashservice` /*!40100 DEFAULT CHARACTER SET latin1 */;
USE `carwashservice`;
 
DROP TABLE IF EXISTS `cars`;
CREATE TABLE `cars` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `model` VARCHAR(45) NOT NULL,
  `user` INT(11) DEFAULT NULL,
  `insurance` INT(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `user_idx` (`user`),
  KEY `insurance_idx` (`insurance`),
  CONSTRAINT `user` FOREIGN KEY (`user`) REFERENCES `users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1;
 
DROP TABLE IF EXISTS `insurance`;
CREATE TABLE `insurance` (
  `id` INT(11) NOT NULL,
  `cost` VARCHAR(45) NOT NULL,
  `exp_date` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`),
  CONSTRAINT `id` FOREIGN KEY (`id`) REFERENCES `cars` (`insurance`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
DROP TABLE IF EXISTS `tariffs`;
CREATE TABLE `tariffs` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `description` VARCHAR(45) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `id` (`id`,`description`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=latin1;
 
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
  `id` INT(11) NOT NULL,
  `name` VARCHAR(45) NOT NULL,
  `tariff` INT(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `tariff_idx` (`tariff`),
  KEY `id` (`id`,`name`),
  CONSTRAINT `tariff` FOREIGN KEY (`tariff`) REFERENCES `tariffs` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1;