java - Hibernate:org.hibernate.NonUniqueObjectException:

Question

我有 3 个不同的实体类，即 Pashmina、Description、Image、PashminaColour。这里，Pashmina 与描述、图像和 PashminaColour 具有一对多关系。我试图同时保存所有这些实体，但出现了一些错误:

(org.hibernate.HibernateException) org.hibernate.HibernateException: org.hibernate.NonUniqueObjectException: A different object with the same identifier value was already associated with the session : [com.nepitc.mshandloomfrabics.entity.Description#0]

我使用以下代码来保存

@Override
public void insert(T t) throws HibernateException {
    session = sessionFactory.openSession();
    trans = session.beginTransaction();

    try {
        session.save(t);
        trans.commit();
    } catch(HibernateException ex) {
        trans.rollback();
        throw new HibernateException(ex);
    } finally {
        session.close();   
    }
}

注意:如果我仅使用一张图像、描述或 pashmina 颜色保存 Pashmina 详细信息，它可以让我插入，但如果我使用多个图像保存 Pashmina，pashmina 颜色或描述会显示错误。

这就是我实现 Controller 的方式

@RequestMapping(value = "/add-pashmina", method = RequestMethod.POST)
    public @Async ResponseEntity<String> insertPashmina(@RequestBody Pashmina pashmina) {
        if (pashmina != null) {
            try {
                pashminaService.insert(pashmina);

                pashminaId = pashmina.getPashminaId();

                for (PashminaColour pash : pashmina.getPashminaColor()) {
                    pashminaColorService.insert(new PashminaColour(pash.getColor(), new Pashmina(pashminaId)));
                }

                for (Description desc : pashmina.getDescriptions()) {
                    descriptionService.insert(new Description(desc.getPashminaDescription(), new Pashmina(pashminaId)));
                }

                return new ResponseEntity<>(HttpStatus.OK);

            } catch (HibernateException e) {
                return new ResponseEntity<>(e.getMessage(), HttpStatus.BAD_REQUEST);
            }
        } else {
            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
        }
    }

羊绒

public class Pashmina implements Serializable {

    private static final long serialVersionUID = 1L;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "sq_pashmina_id")
    @SequenceGenerator(name = "sq_pashmina_id", sequenceName = "sq_pashmina_id")
    @Column(name = "PASHMINA_ID", unique = true, nullable = false)
    private int pashminaId;

    @Column(name = "PASHMINA_NAME")
    private String pashminaName;

    @Column(name = "PRICE")
    private double price;

    @Column(name = "ADDED_AT", insertable = false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date addedAt;

    @Column(name = "CATEGORY")
    private String category;

    @Column(name = "ENABLED", insertable = false)
    private Character enabled;

    @OneToMany(mappedBy = "pashmina", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<PashminaColour> pashminaColor;

    @OneToMany(mappedBy = "pashmina", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<Image> images;

    @OneToMany(mappedBy = "pashmina", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<Description> descriptions;

图片

public class Image implements Serializable {

    private static final long serialVersionUID = 1L;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Id

    @Column(name = "IMAGE_ID")
    private int imageId;

    @Column(name = "IMAGE_NAME")
    private String imageName;

    @JoinColumn(name = "PASHMINA_ID", referencedColumnName = "PASHMINA_ID")
    @ManyToOne
    private Pashmina pashmina;

    @Column(name = "PUBLIC_ID")
    private String publicId;

羊绒颜色

public class PashminaColour implements Serializable {

    private static final long serialVersionUID = 1L;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Id

    @Column(name = "COLOUR_ID", insertable = false)
    private int colourId;
    @Column(name = "COLOR")
    private String color;

    @JoinColumn(name = "PASHMINA_ID", referencedColumnName = "PASHMINA_ID")
    @ManyToOne
    private Pashmina pashmina;

描述

public class Description implements Serializable {

    private static final long serialVersionUID = 1L;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Id

    @Column(name = "DESCRIPTION_ID")
    private int descriptionId;

    @Column(name = "PASHMINA_DESCRIPTION")
    private String pashminaDescription;

    @JoinColumn(name = "PASHMINA_ID", referencedColumnName = "PASHMINA_ID")
    @ManyToOne
    private Pashmina pashmina;

对于每个类，Id 都是使用 Oracle 数据库中的触发器插入的。谢谢!

如果你们不理解我，请告诉我

这就是我将实体发送到 Controller 的方式

Answer 1

我认为问题在于您从 ajax 请求发送的实体类名称不匹配。我看到您正在发送 PashminaModel 实体，但您在 Spring POJO 类中仅使用 Pashmina 。尝试改变你的实体类，即。 Pashmina 到 PashminaModel，Description 到 DescriptionModel，Image 到 ImageModel、Pashmina 到 PashminaModel。

希望它能起作用。