编译：创建名为“Entity ManagerFactory”的bean时出错

Question

实体：

@Entity 
@Table(name = "accessories")
public class Accessory implements Serializable {

private static final long serialVersionUID = 1L;

@Id
private Integer id;

@OneToMany(mappedBy = "accessory", cascade = CascadeType.ALL)
private Set<AccessoryLang> accessorylang = new HashSet<AccessoryLang>();

@Entity 
@Table(name = "accessories_langs")
public class AccessoryLang implements Serializable {

private static final long serialVersionUID = 1L;

@EmbeddedId
private AccessoryLangId accessorylangid;

@ManyToOne(fetch = FetchType.LAZY)
@MapsId("accessoryId")
@JoinColumn(name = "accessories_id", nullable = false)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnore
private Accessory accessory;

@ManyToOne(fetch = FetchType.LAZY)
@MapsId("langId")
@JoinColumn(name = "langs_id", nullable = false)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnore
private Lang lang;

@Column(nullable = false, length = 45)
@NotEmpty   
private String name;

Answer 1

问题是，你有一个多对多的关系，在你的例子中映射为多对一和一对多。

你在附件和朗之间有很多对很多的关系。JPA可以让您更好地直接映射它。

请查看本文或搜索“JPA多对多映射”https://vladmihalcea.com/the-best-way-to-use-the-manytomany-annotation-with-jpa-and-hibernate/