Java JsonInclude无法防止惰性初始化的NULL-OneToMany关系的映射异常
我已经将FetchType.LAZY和JsonInclude属性添加到两个实体之间的OneToMany关系中。但是,如果一对多关系集合为null,则在获取所属实体时仍会出现映射异常Java JsonInclude无法防止惰性初始化的NULL-OneToMany关系的映射异常,java,spring,spring-boot,jackson,jackson2,Java,Spring,Spring Boot,Jackson,Jackson2,我已经将FetchType.LAZY和JsonInclude属性添加到两个实体之间的OneToMany关系中。但是,如果一对多关系集合为null,则在获取所属实体时仍会出现映射异常 @Entity @Getter @Setter @NoArgsConstructor @JsonInclude(value = Include.NON_NULL) public class Company extends AuditModel implements Serializable { privat
@Entity
@Getter
@Setter
@NoArgsConstructor
@JsonInclude(value = Include.NON_NULL)
public class Company extends AuditModel implements Serializable {
private static final long serialVersionUID = 4627788171283297107L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Version
private Integer version;
@Column(nullable = false, length = 25)
private String name;
@Column(nullable = false, length = 10)
private String pan;
@Column(nullable = false, length = 21)
private String cin;
private String vatTin;
@Column(nullable = false, length = 10)
private String tan;
private Address address;
@OneToMany(fetch = FetchType.LAZY)
@JoinTable(name = "Company_Branches", joinColumns = @JoinColumn(name = "company_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "branch_id", referencedColumnName = "id"))
private List<Branch> branches;
}
如果任何公司的分支机构为空,我会得到这个
2018-10-20 21:59:23.733警告70144-[nio-8080-exec-7].w.s.m.s.DefaultHandlerExceptionResolver:已解决[org.springframework.http.converter.HttpMessageNotWritableException:无法写入JSON:未能延迟初始化角色集合:com.xxx.entity.Company.branchs,无法初始化代理-无会话;嵌套异常为com.fasterxml.jackson.databind.JsonMappingException:未能延迟初始化角色集合:com.xxx.xxx.entity.Company.branchs,无法初始化代理-通过引用链没有会话:java.util.Collections$UnmodifiableRandomAccessList[0]->com.xxx.xxx.entity.Company[branchs]我缺少jackson数据类型hibernate;配置了对象映射器
public class HibernateAwareObjectMapper extends ObjectMapper {
private static final long serialVersionUID = -4934273698008915161L;
public HibernateAwareObjectMapper() {
registerModule(new Hibernate5Module());
}
}
这就解决了问题