Yes, has how, so that it is possible to do the following (using this question as a reference):
Add this to your id attribute':
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY, generator="IdOrGenerated")
@GenericGenerator(name="IdOrGenerated",
strategy="....UseIdOrGenerate"
)
@Column(name = "ID", nullable = false)
private Integer id;
And add this class:
import org.hibernate.id.IdentityGenerator;
...
public class UseIdOrGenerate extends IdentityGenerator {
private static final Logger log = Logger.getLogger(UseIdOrGenerate.class.getName());
@Override
public Serializable generate(SessionImplementor session, Object obj) throws HibernateException {
if (obj == null) throw new HibernateException(new NullPointerException()) ;
if ((((EntityWithId) obj).getId()) == null) {
Serializable id = super.generate(session, obj) ;
return id;
} else {
return ((EntityWithId) obj).getId();
}
}