Hibernate 引发异常，表示实体不存在标识符

是否应该遵循这种设计模式？我从dto包中的域（这是一个包含所有实体类的不同项目）引入Country和Lang，我映射这些表。

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谢谢

您没有@IdNo…我应该将对象设为EmbeddedId而不是embedded吗？任何类都不应该同时具有

@Entity

和

@embedded

。如果类存储为嵌入式（仅），则它没有自己的表（

@table

），也没有

@Id

，也没有

@Entity

。任何JPA参考都可以解释这一点

 @Entity
    @Table(name = "COUNTRY")
    @Embeddable
    public class Country implements Serializable {

        /**
         * 
         */
        private static final long serialVersionUID = 1L;

        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name = "CTRY_ID_NBR", nullable = false)
        private Integer countryIdNumber;

        @Column(name = "CTRY_CD_NM", nullable = false)
    private String countryCodeName;

    @Column(name = "CTRY_NM")
    private String countryName;

    @Column(name = "CTRY_CUR_SUFFIX_NM")
    private String countryCurrencySuffixName;

    @Column(name = "CTRY_CUR_CD_NM")
    private String countryCurrencyCodeName; 
} 

@Entity
@Table(name = "LANG")
@Embeddable
    public class Lang implements Serializable {
        /**
         * 
         */
        private static final long serialVersionUID = 1L;

        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name = "LANG_ID_NBR")
        private Integer langIdNumber;

        @Column(name = "CTRY_ID_NBR", insertable = false, updatable = false)
        private Integer countryIdNumber;

        @Column(name = "LANG_CD_NM")
        private String langCodeName;

        @Column(name = "LANG_NM")
        private String langName;}

  @Entity
    public class LangDto {

        @Embedded
        @AttributeOverrides({ @AttributeOverride(name = "countryIdNumber", column = @Column(name = "CTRY_ID_NBR")),
                @AttributeOverride(name = "langCodeName", column = @Column(name = "LANG_CD_NM")),
                @AttributeOverride(name = "langName", column = @Column(name = "LANG_NM")) })
        private Lang lang;

        @ManyToOne
        @JoinColumn(name = "CTRY_ID_NBR", nullable = false)
        private CountryDto countryDto;
    }

 @Entity
    public class CountryDto {

        @Embedded
        @AttributeOverrides({ @AttributeOverride(name = "countryIdNumber", column = @Column(name = "CTRY_ID_NBR")),
                @AttributeOverride(name = "countryCodeName", column = @Column(name = "CTRY_CD_NM")),
                @AttributeOverride(name = "countryName", column = @Column(name = "CTRY_NM")),
                @AttributeOverride(name = "countryCurrencySuffixName", column = @Column(name = "CTRY_CUR_SUFFIX_NM")),
                @AttributeOverride(name = "countryCurrencyCodeName", column = @Column(name = "CTRY_CUR_CD_NM")) })
        private Country country;



        @OneToMany(mappedBy = "countryDto", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
        private List<LangDto> lang;

org.hibernate.AnnotationException: No identifier specified for entity: com.fedex.ftt.nexgen.dto.LangDto