如何解决线程"main"中的错误异常 org.hibernate.注释异常： 没有为实体指定标识符： 员工

Question

线程"main"中的异常 org.hibernate.AnnotationException： 没有为实体指定标识符：员工 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：417( at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java：86( at StoreData.main(StoreData.java：14(

Answer 1

如果您提供您的员工类，那就太好了。 此问题意味着您的实体类缺少一个字段，该字段用@Id注释。每个@Entity都需要并@Id，这是数据库中的主键。

Answer 2

@Entity@Table(名称 = "员工"， 架构="测试"( 公共类员工 {

@Column(name="FIRST_NAME")
private String `firstName`;  

@Column(name="LAST_NAME")
private String `lastName`;
public String `getFirstName()` {  
return `firstName`;  

}
public voidsetFirstName(String firstName){
this.firstName=firstName;
}

public StringgetLastName(( {
returnlastName;
}
public voidsetLastName(StringlastName( {
this.lastName=lastName;
}
}