UUIDCustomVersionOneStrategy.java

@Entity
public class MyEntity {

    @Id
    @GeneratedValue( generator = "uuid" )
    @GenericGenerator(
        name = "uuid",
        strategy = "org.hibernate.id.UUIDGenerator",
        parameters = {
            @Parameter(
                name = "uuid_gen_strategy_class",
                value = "org.hibernate.id.uuid.CustomVersionOneStrategy"
            )
        }
    )
    public UUID id;

    ...

}