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.
原文链接：https://www.f2er.com/spring/431877.html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
