Hibernate:org.hibernate.NonUniqueObjectException：

Question

我有三个不同的实体类，即Pashmina、Description、Image、PashminaColour。在这里，Pashmina与描述、图像和PashminaColour有一个PashminaColour关系。我试图同时保存所有这些实体，但在那里出现了一些错误：

(org.hibernate.HibernateException) org.hibernate.HibernateException: org.hibernate.NonUniqueObjectException:具有相同标识符值的不同对象已经与会话关联：

我使用了以下代码来保存

@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:如果我只保存一个图片、描述或Pashmina颜色的pashmina细节，它可以让我插入，但是如果我用多个图像保存Pashmina，则pashmina颜色或描述显示了一个错误。

我就是这样实现控制器的

@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);
        }
    }

Pashmina

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;

图像

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;

PashminaColour

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，都使用触发器在oracle数据库中插入Id。谢谢!

如果你们不了解我就告诉我

这就是我如何将实体发送给控制器的方式。

​

Answer 1

我认为问题在于与您从ajax请求发送的实体类名不匹配。我看到您正在发送PashminaModel实体，但是在spring类中只使用Pashmina。试着唱你的实体课.Pashmina to PashminaModel，Description to DescriptionModel，Image to ImageModel，Pashmina to PashminaModel。

希望它能成功。