java - hibernate 无法在注释方法中指定通用属性标识符

Question

我为所有实体创建一个基类，每个新实体类都扩展它。 在基类中，我对 orm 使用注释，代码如下:

public class BaseEntity<I> implements IBaseEntity<I> {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID", nullable = false)
private I id;


public I getId() {
return id;
}

public void setId(I id) {
this.id = id;
}}

然后我创建一个类如下:

@SuppressWarnings("serial")
@Entity
@Table(name = FoodEntity.TABLE_NAME, schema = "public")
public class FoodEntity extends BaseEntity<Long> {

public static final String TABLE_NAME = "T_Food";

@Column(name = "NAME", unique = true, nullable = false, length = 500)
private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}}

但是，当我执行示例来测试我的类时，出现以下异常:

    Initial SessionFactory creation failed.org.hibernate.AnnotationException: No identifier specified for entity: FoodEntity
Exception in thread "main" java.lang.ExceptionInInitializerError
at ir.msr.projects.crawler.HibernateUtil.buildSessionFactory(HibernateUtil.java:31)
at ir.msr.projects.crawler.HibernateUtil.<clinit>(HibernateUtil.java:14)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: FoodEntity
at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:266)
at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:211)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:731)
at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:249)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:222)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:265)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:691)

Answer 1

我找到了答案，我必须对 BaseEntity 类(父类)使用 @MappedSuperclass。