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【原】JPA报错“No identifier specified for entity”的原因

不忘初心 2019-03-23 围观() 评论() 点赞() 【JAVA开发】

简介：之前在SSH框架中，用过Hibernate这个ORM框架，之后一直都是用的是Mybatis，最近公司里面使用springboot的框架中集成了JPA，虽然我觉着各种不好，但是讲真的还是挺好用，跟Hibernate相比还要简单，基本上都不用自己怎么写查询，今天在使用的时候手一抖，少复制了点儿代码，直接导致启动时报了一个错误“No identifier specified for entity”。20

之前在SSH框架中，用过Hibernate这个ORM框架，之后一直都是用的是Mybatis，最近公司里面使用springboot的框架中集成了JPA，虽然我觉着各种不好，但是讲真的还是挺好用，跟Hibernate相比还要简单，基本上都不用自己怎么写查询，今天在使用的时候手一抖，少复制了点儿代码，直接导致启动时报了一个错误“No identifier specified for entity”。

2019-03-22 13:49:05,418 ERROR SpringApplication: Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.wolffy.jpa.dataobject.GooglePushLogDO
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
        at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:151)
        at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:131)
        at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:86)
        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5245)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:985)
        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.wolffy.jpa.dataobject.GooglePushLogDO
        at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:265)
        at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:211)
        at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:717)
        at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:245)
        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.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:874)
        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
        ... 29 common frames omitted

由于这种代码都是粘贴复制之前写过的，Java类代码如下：

package com.wolffy.jpa.dataobject;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;

@Entity
@Table(name = "google_push_log")
@Getter
@Setter
public class GooglePushLogDO {

    private Long id;

    private String api_key;

    private String apiUrl;

    private String apiRequest;

    private String apiResponse;

    @Column(name = "`from`")
    private String from;

    private Date createTime;

}

仔细检查之后，发现导致启动失败的原因，是因为在主键ID上面少了两个注解：@Id、@GeneratedValue(strategy = GenerationType.AUTO)

package com.wolffy.jpa.dataobject;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;

@Entity
@Table(name = "google_push_log")
@Getter
@Setter
public class GooglePushLogDO {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String api_key;

    private String apiUrl;

    private String apiRequest;

    private String apiResponse;

    @Column(name = "`from`")
    private String from;

    private Date createTime;

}