自引用记录导致“直接自引用导致循环”异常

Question

我有自我参考课

@Entity
@Table(name = "contacts")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@Document(indexName = "contacts")
public class Contacts implements Serializable
{

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@Column(name = "username")
private String username;

@Column(name = "password_smartlpc")
private String password;

@Column(name = "full_name")
private String fullName;

@ManyToOne
private Contacts companyContact;
}

但为了我的一份数据库记录

id  full_name   username    password    company_contact_id  
5   JAK movies  abc          xyz               5

此记录以company_contact_id作为其自引用( self id.Which )，而检索则进入自引用循环。

Enter: com.fps.web.rest.errors.ExceptionTranslator.processRuntimeException() 
with argument[s] = 
[org.springframework.http.converter.HttpMessageNotWritableException: Could not 
 write content: Direct self-reference leading to cycle (through reference 
 chain: java.util.UnmodifiableRandomAccessList[2]-
 >com.fps.domain.Contacts["companyContact"]-
 >com.fps.domain.Contacts["companyContact"]); nested exception is 
 com.fasterxml.jackson.databind.JsonMappingException: Direct self-reference 
 leading to cycle (through reference chain: 
 java.util.UnmodifiableRandomAccessList[2]-
  >com.fps.domain.Contacts["companyContact"]-
 >com.fps.domain.Contacts["companyContact"])]       

我试过了

(fetch = FetchType.LAZY) = gives same error as above.
@JsonIgnore :  removes error but does not retrieves Company_Contact_id
@JsonManagedReference @JsonBackReference same as above.

不幸的是，我不能更改数据库或修改it.Since，它的legacy.Any，我还可以尝试更多的东西吗？谢谢

Answer 1

尝试在使用DTO中使用JHipster，您将获得对JSON序列化的更多控制，而不是简单地公开您的实体，特别是当您受到遗留数据库模式的限制时。