how to create a composite primary key hibernate JPA?

Question

i try to create composite primary key in table from 2 foreign key using hibernate JPA,but gives me error.I find some solution on net but nothing

The relations betw

Answer 1

Remove constructor from

@EmbeddedId
private ServiceDepartmentPK serviceDepartmentPK;

Remove @ManyToOne annotation from ServiceDepartmentPK class and set fields types to long or int

@Embeddable

public class ServiceDepartmentPK  implements Serializable {

private static final long serialVersionUID = 1L;
@Column(name="COLUMN_NAME")
private long clientId;

@Column(name="COLUMN_NAME")
private long carServiceId;

public ServiceDepartmentPK  () {
}
// getters setters for client and carserver ids-s

public boolean equals(Object other) {
    if (this == other) {
        return true;
    }
    if (!(other instanceof ServiceDepartmentPK  )) {
        return false;
    }
    ServiceDepartmentPK  castOther = (ServiceDepartmentPK  )other;
    return 
        (this.scopeId == castOther.clientId)
        && (this.scriptId == castOther.carServiceId);

}

public int hashCode() {
    final int prime = 31;
    int hash = 17;
    hash = hash * prime + ((int) (this.clientId ^ (this.clientId>>> 32)));
    hash = hash * prime + ((int) (this.carServiceId ^ (this.carServiceId>>> 32)));

    return hash;
}

}