@OneToMany 拥有自学课程

Question

我只需要帮助我创建这个简单的类，其中Category包含Categories. 当我尝试使用父类别保存子类别列表时，它显示以下错误。杰森：-{    "name": "n11111111",    "detail": "detail",    "status" : "AVAILABLE",    "subCategories": [3, 12, 100, 7, 11] // id of sub-cat}班级：-@Entity@Table(name = "category")public class Category{    @Id    @GeneratedValue(strategy= GenerationType.AUTO)    @Column(nullable = false, updatable = false, name = "category_id")    private Long id;    @Column(name = "name", nullable=false)    private String name;    @Column(name = "detail", nullable=false)    private String detail;    @Column(nullable = false, name = "status")    @Enumerated(EnumType.ORDINAL)    private Status status;    @OneToMany( targetEntity=Category.class, cascade=CascadeType.ALL)    private List<Category> subCategories;}错误：- "message": "could not execute statement; SQL [n/a]; constraint [UK_76grwe00i7mrj7awuvhc3kx0n]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement",MYSQL 错误：- #1062 - Duplicate entry代码：- 从 Vo 转换为 POJOprivate Categorie getCatToPojo(CategorieVo categorieVo, String type) {    double startTime = System.nanoTime();    logger.info("Start Vo To Pojo Categorie");    // #:- case:-1 when no sub-cat there it save only below 3 attribute    this.categorie = new Categorie();    this.saveNameCat(categorieVo, type);    this.categorie.setDetail(categorieVo.getDetail());    this.categorie.setStatus(categorieVo.getStatus());    // #:- case:-2 when have list of sub-cat then will exe then next process    }}