Json 使用Spring Boot和Neo4j通过REST API插入实体时出错

我正在用Spring Boot测试Neo4j，当我尝试使用Rest API插入元素时，我发现了以下问题：JSON无法序列化为实体。如果有人能帮助我或解释如何更改我的代码或如何序列化该实体，我将非常感激。 我的课程是。。。 用户实体

@NodeEntity
public class User extends AbstractEntity{

    @Id
    @GeneratedValue
    private Long id;

    private String firstname, lastname;


    @NotNull @NotBlank @Email
    @Index(unique = true)
    private String email;

    @Index(unique = true)
    private String phone;

    @Relationship(type = "ADDRESS")
    private Set<Address> addresses = new HashSet<>();

    public User() {
    }
    //get & set & const....
    }

国家实体

@NodeEntity
public class Country extends AbstractEntity {
    /*Update the OMG [https://neo4j.com/developer/neo4j-ogm] and remove de id.
     Keep the id in AbstractEntity*/
    @Id
    @GeneratedValue
    private Long id;

    @Index(unique=true)
    private String code;

    private String name;

    public Country(String code, String name) {
        this.code = code;
        this.name = name;
    }

    public Country() {
    } 
  }

抽象实体

@EnableNeo4jAuditing
public abstract class AbstractEntity {

    public abstract Long getId();

    @Transient
    private SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");

    private Date created = new Date();

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    @Override
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }

        if (getId() == null || obj == null || !getClass().equals(obj.getClass())) {
            return false;
        }
        return getId().equals(((AbstractEntity) obj).getId());

    }

    @Override
    public int hashCode() {
        return getId() == null ? 0 : getId().hashCode();
    }
}

我的商店用户的简单存储库类

public interface UserRepository extends Neo4jRepository<User, Long> {

    User findByFirstname(String name);

    @Override
    void delete(User deleted);
}

如您所见，国家/地区将其作为空值返回，如果它存在于数据库中

当我试图使用API插入一个元素时，它哀叹了一个错误，我无法将country对象序列化为JSON

$ curl -i -X POST -H "Content-Type: application/json" -d '{"firstname":"Yuniel","lastname":"Acosta Pérez","email":"yuniel.acosta@someserver.com","phone":"+999999999999","addresses":[{"street":"Some Stree","city":"Some City","country":[{"code":"OO","name":"ANYCOUNTRY"}]}]}' localhost:8088/users

下一个错误就是把我扔出去的那个

{“时间戳”：“2018-09-27T21:07:56.365+0000”，“状态”：400，“错误”：“错误请求”，“消息”：“JSON解析错误：无法反序列化

com.syskayzen.hypercube.domain.Address

out-of-START\u数组标记的实例；嵌套异常为com.fasterxml.jackson.databind.exc.MismatchedInputException:无法反序列化

com.syskayzen.hypercube.domain.Address

out-of-of-START\u数组标记的实例，位于[源代码：（PushbackInputStream）；行：1，列：122]（通过引用链：com.syskayzen.hypercube.domain.User[\“addresses\”]），“path:“/users”}

如果您能告诉我如何解决如何序列化国家/地区实体的问题，或者是由于其他原因导致了错误

---

我使用的是Spring Boot 2.0.5和Spring Data Neo4j，我相信在curl命令中Country返回null的原因是因为查询在数据库中只深入了1跳。因此，它会拉用户，然后再拉地址节点1跳，但随后会停止。要让它沿着路径拉更多跳，需要指定一个depth

您可以通过在curl命令中指定一个深度，并为“int depth”添加一个参数来传递存储库调用来实现这一点。这将允许您拥有一个动态深度，以防您向要检索的应用程序添加更多跃点

服务方法看起来像这样

public User show(Long id, int depth) {
        return userRepository.findById(id, depth).get();
}

以下链接提供了相关文档：

@RestController
public class UserController {
    @Autowired
    UserService userService;

    @RequestMapping(method = RequestMethod.GET, value = "/users")
    public Iterable<User> user() {
        return userService.contact();
    }

    @RequestMapping(method = RequestMethod.POST, value = "/users")
    public String save(@RequestBody User user) {
        try {
            userService.save(user);
        }catch (org.neo4j.driver.v1.exceptions.ClientException ex){
            System.err.println("******||||||||||||[{   The User exist with the same email   }]||||||||||||******");
        return "The User exist with the same email";
        }
        return user.toString();
    }
    @RequestMapping(method=RequestMethod.GET, value="/users/{id}")
    public User show(@PathVariable Long id) {
        try{
        return userService.show(id);}
        catch (java.util.NoSuchElementException ex){
            System.err.println("******||||||||||||[{   The User do not exist    }]||||||||||||******");
        }
        return null;
    }
    @RequestMapping(method=RequestMethod.PUT, value="/users/{id}")
    public User update(@PathVariable Long id, @RequestBody User user) {
        return userService.update(id, user);
    }
    @RequestMapping(method=RequestMethod.DELETE, value="/users/{id}")
    public String delete(@PathVariable Long id) {
        return userService.delete(id);
    }

}

$ curl -i -H "Accept: application/json" localhost:8088/users/1
HTTP/1.1 200
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 27 Sep 2018 20:38:31 GMT

{"created":"2018-09-27T19:55:21.578+0000","id":1,"firstname":"Yuniel","lastname":"Acosta Pérez","email":"yuniel.acosta@someserver.com","phone":"+999999999999","addresses":[{"created":"2018-09-27T19:55:21.578+0000","id":0,"street":"Some Stree","city":"Some City","country":null}]}

$ curl -i -X POST -H "Content-Type: application/json" -d '{"firstname":"Yuniel","lastname":"Acosta Pérez","email":"yuniel.acosta@someserver.com","phone":"+999999999999","addresses":[{"street":"Some Stree","city":"Some City","country":[{"code":"OO","name":"ANYCOUNTRY"}]}]}' localhost:8088/users

public User show(Long id, int depth) {
        return userRepository.findById(id, depth).get();
}