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【原】springboot jpa启动报错“org.hibernate.AnnotationException: No identifier specified for entity”

不忘初心 2020-01-18 围观() 评论() 点赞() 【JAVA开发】

简介：在springboot工程中集成了jpa之后，启动直接分分钟报错“Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.zhiri.service.entity.Permission”。

在springboot工程中集成了jpa之后，启动直接分分钟报错“Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.zhiri.service.entity.Permission”。

详细错误信息如下：

2019-11-18 22:13:14 [main] [ERROR] [org.springframework.boot.SpringApplication:826] - Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.zhiri.service.entity.Permission
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1108)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at com.zhiri.api.ApiApplication.main(ApiApplication.java:13)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.zhiri.service.entity.Permission
	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:781)
	at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:254)
	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:230)
	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:273)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:1214)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1245)
	at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58)
	at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
	at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:391)
	at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:378)
	at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799)
	... 16 common frames omitted

实体bean代码如下：

/**
 * 权限表
 */
@EqualsAndHashCode(callSuper = true)
@Data
@Entity
@Table(name = "permission")
public class Permission extends BaseEntity {

}

第一反应是没有加@Entity和@Id注解，但是我确定是加过的，去比对了一下之前的项目，唯一不同的就是我抽了一个公共父类，因为在做设计的时候，每张表都会有ID、创建人、创建时间、逻辑删除等字段，所以就抽了一个BaseEntity，结果问题就出在这里了。

因为抽的字段中包含了ID，而ID在父类中，jpa加载的子类继承不下来，就会导致找不到主键，所以追加一个@MappedSuperclass注解（加@Entity注解无用）。

改进之后：

@Data
//不加此注解会导致子类找不到ID
@MappedSuperclass
public class BaseEntity {

    /**
     * 主键ID
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "JDBC")
    private Long id;

    /**
     * 创建时间
     */
    @Column(name = "create_time")
    private Date createTime;

    /**
     * 更新时间
     */
    @Column(name = "update_time")
    private Date updateTime;

    /**
     * 删除标记：0、未删除，1、已删除
     */
    private Boolean deleted = false;

}