JPA 映射@EmbeddedId 与多对一关系

Question

so i searched for the answers for my problem on the internet but didn't find something that helped, basically a need to have a ManyToOne Relationship between two classes, of which one of them has a EmbeddedId, i'm going to leave the code here and the error message that it gives (i'm using wildfly to run the server).

public class InventoryPK implements Serializable {

@ManyToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "user_id")
private Item itemId;

@ManyToOne
@JoinColumn(name="CD_EMPRESA")
private Company company;

}

@Entity @Table(name = "inventario", schema = "mxnextmob")

public class Inventory extends BaseModel {

@EmbeddedId
private InventoryPK id;

@SequenceGenerator(schema = "mxnextmob", name = "inventory_sequence", sequenceName = "inventory_sequence", allocationSize = 1, initialValue = 1)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "inventory_sequence")
private Integer inventory;

@Column
private BigDecimal quantity;

@Column
private BigDecimal weight;

}

public class Company extends BaseModel {

@Id
@SequenceGenerator(schema = "mxnextmob", name = "company_sequence", sequenceName = "company_sequence", allocationSize = 1, initialValue = 1)
@GeneratedValue(strategy = GenerationType.AUTO, generator = "company_sequence")
private Integer code;

@Column
private String name;

@OneToMany(mappedBy = "company")
private List<UserSeller> userSeller;

@OneToMany(mappedBy = "id.company")
private List<Inventory> inventories;

}

and the error is as follows:

service jboss.persistenceunit."mxnext-mobile.war#mxnextmobileDS": org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: br.com.maxiconsystems.mobile.model.Inventory.company in br.com.maxiconsystems.mobile.model.Company.inventory

Answer 1

There are a few ways to map what you seem to have as a table, but I'd recommend Inventory be changed to something like:

public class Inventory extends BaseModel {
  @Id
  @SequenceGenerator(schema = "mxnextmob", name = "inventory_sequence", sequenceName = "inventory_sequence", allocationSize = 1, initialValue = 1)
  @GeneratedValue(strategy = GenerationType.AUTO, generator = "inventory_sequence")
  private Integer inventory;

  @Embedded
  private InventoryPK alternateKey;

  @Column
  private BigDecimal quantity;

  @Column
  private BigDecimal weight;
}

This allows you to use the inventory Integer as its primary key; this simplifies any future references you may need to add to Inventory, as foreign keys would be required in JPA to reference all its ID columns.