java - 由 : org. hibernate.PropertyNotFoundException 引起:无法在类上找到字段名称

Question

您好，我有 2 个实体国家/地区，具有嵌入的 Id 属性

@IdClass(Country.class)
@Entity
@Table(name="country")
public class Country implements Serializable{
    @Id
    @Column(name="code", length=3, nullable=false)
    private String code;

    @Column(name="name", length=256, nullable=false)
    private String name;
    @EmbeddedId
    private CountryLanguage language;

    public CountryLanguage getCountryLanguage() {
        return language;
    }

    public void setCountryLanguage(CountryLanguage language) {
        this.language = language;
    }

具有 getter 和 setter 的 CountryLanguage 嵌入式类

@Embeddable
public class CountryLanguage {

    @Column(name="country_code", length=3, nullable=false)
    private String code;

    @Column(name="language", length=256, nullable=false)
    private String language;

    @Column(name="is_official", length=256, nullable=false)
    private boolean official;

我有一个异常(exception)

Caused by: java.lang.reflect.InvocationTargetException: null springbootapp    
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_212] springbootapp    
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_212] springbootapp    
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_212] springbootapp    
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_212] springbootapp    
at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:104) ~[hibernate-core-5.4.10.Final.jar!/:5.4.10.Final] springbootapp    
... 46 common frames omitted springbootapp    
 Caused by: org.hibernate.PropertyNotFoundException: Could not locate field name [official] on class [hello.world.entity.Country]

Answer 1

仅需要 @IdClass 和 @EmbeddedId 方法之一。此外，@IdClass 是错误的，因为嵌入 id 的类是 CountryLanguage。此外，使用 @Id 和 @Column 注释的 Country 上的 code 字段也与 code 冲突CountryLanguage 上的 > 字段，用 @Column 注释。

对于 @EmbeddedId 方法，应将 @IdClass 注释与 code 上的 @Id 一起删除解决问题。