Both answers from Eric Lucio and Renan helped, but their use of the ids in the association table is redundant. You have both the associated entities and their ids in the class. This is not required. You can simply map the associated entity in the association class with the @Id on the associated entity field.
@Entity
public class Employer {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@OneToMany(mappedBy = "employer")
private List<EmployerDeliveryAgent> deliveryAgentAssoc;
// other properties and getters and setters
}
@Entity
public class DeliveryAgent {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@OneToMany(mappedBy = "deliveryAgent")
private List<EmployerDeliveryAgent> employerAssoc;
// other properties and getters and setters
}
The association class
@Entity
@Table(name = "employer_delivery_agent")
@IdClass(EmployerDeliveryAgentId.class)
public class EmployerDeliveryAgent {
@Id
@ManyToOne
@JoinColumn(name = "employer_id", referencedColumnName = "id")
private Employer employer;
@Id
@ManyToOne
@JoinColumn(name = "delivery_agent_id", referencedColumnName = "id")
private DeliveryAgent deliveryAgent;
@Column(name = "is_project_lead")
private boolean isProjectLead;
}
Still need the association PK class. Notice the field names should correspond exactly to the field names in the association class, but the types should be the type of the id in the associated type.
public class EmployerDeliveryAgentId implements Serializable {
private int employer;
private int deliveryAgent;
// getters/setters and most importantly equals() and hashCode()
}