我有些困惑如何在实体映射中添加业务键。所有实体都使用Long作为Id，但现在我需要创建一个复合Id，我的疑问是，我可以混合@Id和@EmbeddedId吗？还是只有嵌入式对象必须是唯一的Id？
以下是代码：
@MappedSuperclass
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public abstract class AbstractEntity implements Serializable {
/**
*
*/
private static final long serialVersionUID = 6891295574206401221L;
@Id
@GenericGenerator(
name = "seq_id",
strategy = "br.com.alianca.customerservicemacros.entity.AliancaSequenceGenerator")
@GeneratedValue(generator = "seq_id")
private Long id;
@Column(name = "dt_created")
private Date created;
@Column(name = "dt_altered")
private Date altered;
可嵌入的类：
@Embeddable
public class DacsInfo implements Serializable {
/**
*
*/
private static final long serialVersionUID = 5960251258518073347L;
/**
* Código Docsys do Navio
*/
@Column(name = "COD_VESSEL", length = 4)
private String vessel;
/**
* Código do navio.
*/
@Column(name = "NUM_VOYAGE", length = 5)
private String voyage;
/**
* Primeiros 4 digitos do código do <code>BLUI</code>.
*/
@Column(name = "PREFIX_BLUI", length = 4)
private String prefixBlui;
/**
* Número universal do BL.
*/
@Column(name = "NUM_BLUI", length = 12)
private String blui;
在此，是最终实体：
@Entity
@Table(name = "FATO_DACS_REPT", schema = "u_cs_service")
public class FatoDacsRept extends AbstractEntity {
/**
*
*/
private static final long serialVersionUID = 9148311315020469420L;
@EmbeddedId
private DacsInfo dacsInfo;
@Column(name = "DAT_INPUT")
private Date loading;
/**
* Código da companhia (Hamburg Sud - 699 / Aliança - 690)
*/
@Column(name = "COD_COMPANY", length = 4)
private String company;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "fatoDacsRept")
private List<FatoDacsReptChq> pendencias;