Mappage d'une entité faible avec JPA

Question

Ma base de données contient des sociétés et des employés. J'ai modélisé Employé comme une entité faible de la Société.

Mes annotations JPA ressemblent:

@Entity 
public class Company extends Model { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    public Long id; 

    @OneToMany(mappedBy = "company", cascade = CascadeType.ALL) 
    private List<Employee> employees; 

} 

Employee.java:

@Entity 
public class Employee extends Model { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    public Long id; 

    @ManyToOne(optional = false) 
    @JoinColumn(name="company_id", insertable=false, updatable=false) 
    private Company company; 
} 

Le code SQL suivant est créé:

create table employee (
    id       bigint auto_increment not null, 
    company_id     bigint not null, 
    constraint pk_employee primary key (id) 
); 

alter table employee add constraint fk_employee_company_id foreign key (company_id) references company (id) on delete restrict on update restrict; 

Ce que je veux est (contrainte primaire pk_employee key (id, company_id):

create table employee (
    id       bigint auto_increment not null, 
    company_id     bigint not null, 
    constraint pk_employee primary key (id, company_id) 
); 

alter table employee add constraint fk_employee_company_id foreign key (company_id) references company (id) on delete restrict on update restrict; 

Existe-t-il un moyen de créer un tel script SQL?

EDIT: Laisser Employee mettre en œuvre Serializable ne pas faire l'affaire.

Caused by: javax.persistence.PersistenceException: Could not find BeanDescriptor for class models.Company. Perhaps the EmbeddedId class is not registered? 
    at io.ebeaninternal.server.deploy.BeanEmbeddedMetaFactory.create(BeanEmbeddedMetaFactory.java:26) 
    at io.ebeaninternal.server.deploy.BeanPropertyAssocOne.<init>(BeanPropertyAssocOne.java:79) 
    at io.ebeaninternal.server.deploy.BeanPropertyAssocOne.<init>(BeanPropertyAssocOne.java:62) 
    at io.ebeaninternal.server.deploy.meta.DeployBeanTable.createProperty(DeployBeanTable.java:68) 
    at io.ebeaninternal.server.deploy.meta.DeployBeanTable.createIdProperties(DeployBeanTable.java:59) 
    at io.ebeaninternal.server.deploy.BeanTable.<init>(BeanTable.java:42) 

Answer 1

Il suffit d'ajouter @Id annotation sous votre annotation @JoinColumn. Mais la classe Employee doit utiliser implements Serializable pour utiliser cette solution.