java – 无法处理托管/后向引用’defaultReference’：找不到后

发布时间：2020-12-15 01:23:18 所属栏目：大数据来源：网络整理

导读：我有两个模型类.一个是 @Entity(name = "userTools")@Table(uniqueConstraints = @UniqueConstraint(columnNames = { "assignToUser_id","toolsType_id" }))@Inheritance(strategy = InheritanceType.JOINED)@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,incl

我有两个模型类.一个是

@Entity(name = "userTools")
@Table(uniqueConstraints = @UniqueConstraint(columnNames = { "assignToUser_id","toolsType_id" }))
@Inheritance(strategy = InheritanceType.JOINED)
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,include = JsonTypeInfo.As.PROPERTY,property = "className")
@JsonIgnoreProperties(ignoreUnknown = true)
public class UserTools {

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

    @OneToOne
    private ToolsType toolsType;

    @OneToMany(mappedBy = "userTools",fetch = FetchType.EAGER,cascade = { CascadeType.ALL },orphanRemoval = true)
    @Cascade(org.hibernate.annotations.CascadeType.DELETE)
    @JsonManagedReference
    private List


第二是

@Entity(name = "userToolsHistory")
@JsonIgnoreProperties(ignoreUnknown = true)
public class UserToolsHistory {

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

    @OneToOne
    private ToolsType toolsType;

    @ManyToOne
    @JsonIgnore
    @JsonBackReference
    private UserTools userTools; 

    private String comments;
}

但是在保存时我收到了这个错误：

Can not handle managed/back reference 'defaultReference': no back
reference property found from type [collection type; class
java.util.List,contains [simple type,class
com.dw.model.tools.UserToolsHistory]]


最佳答案
您面临的例外源于MappingJackson2HttpMessageConverter.
要修复它,请交换注释,以便获得：

public class UserTools {
...
@JsonBackReference
private List

本教程解释了必须如何完成：jackson-bidirectional-relationships-and-infinite-recursion

                        （编辑：李大同）
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