Spring Boot关联实体查询报错：仅createOwner可用，查询方法抛异常

本人是Spring Boot新手，当前项目中仅createOwner()方法可正常工作，调用findById()或findAll()方法从关联实体获取数据时会抛出大量异常。

已通过Postman成功提交以下JSON数据保存Owner实体：

{        
    "ownerName": "Harry",
    "car":{
        "car_id" : "2"
    }
}

相关代码及数据库信息 #

Owner实体类 #

@Entity
@Data
public class Owner {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long owner_id;

    private String ownerName;

    @OneToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "c_id", referencedColumnName = "car_id" )
    private Car car;
}

Car实体类 #

@Entity
@Data
public class Car {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long car_id;
    private String car_name;

    @OneToOne(mappedBy = "car")
    private Owner owner;
}

控制器代码 #

@RestController
public class OwnerController {

    @Autowired
    private OwnerRepository ownerRepo;

    @PostMapping("/createowner")
    public Owner createOwner(@RequestBody Owner owner){
        return ownerRepo.save(owner);
    }

    @GetMapping("/findownerbyid")
    public Owner getByID(){
        return ownerRepo.findById(2L).get();
    }

    @GetMapping("/carlist")
    public List<Owner> getOwnerList(){
        return ownerRepo.findAll();
    }
}

Owner仓库 #

@Repository
public interface OwnerRepository extends JpaRepository<Owner, Long> {
}

Car仓库 #

@Repository
public interface CarRepo extends JpaRepository<Car , Long> {
}

数据库数据 #

Owner表数据

+----------+------------+------+
| owner_id | owner_name | c_id |
+----------+------------+------+
|        1 | Tom        |    1 |
|        2 | Harry      |    2 |
+----------+------------+------+

Car表数据

+--------+----------+
| car_id | car_name |
+--------+----------+
|      1 | Toyota   |
|      2 | Audi     |
+--------+----------+

报错情况 #

调用getOwnerList()时出现无限递归导致的JSON序列化异常，核心表现为Jackson无法处理双向关联的循环引用：Owner对象包含Car，Car对象又包含Owner，序列化时反复嵌套解析，最终触发栈溢出错误。

内容的提问来源于stack exchange，提问作者Shadow Face