目录

• JPA出现错误Noidentifierspecifiedforen
• 问题描述
• 问题原因
• 解决方案
• Noidentifierspecifiedforentity:XXXX错误
• 原因及其解决

JPA出现错误No identifier specified for en
问题描述
启动项目未成功，报错如下：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-03-17 13:19:24.391|main|ERROR|org.springframework.boot.SpringApplication.reportFailure:858|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.xxx.domain.Earnings
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:853)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
at com.xxx.YoufanApplication.main(YoufanApplication.java:21)
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.xxx.domain.Earnings
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:778)
at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:250)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:231)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:274)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:904)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:935)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741)
... 16 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:50341', transport: 'socket'
Process finished with exit code 1

首先从其中找到核心错误描述：

Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.xxx.domain.Earnings

问题原因
在实体类com.xxx.domain.Earnings使用javax.persistence.Entity进行注解就会自动进行表的DDL操作
使用hibernate的映射表的时候entity类是必须要主键的，否则就会报出这个异常：No identifier specified for entity

解决方案

import javax.persistence.*; @Entitypublic class Earnings {@Id@GeneratedValue(strategy = GenerationType.AUTO)Long id; // ...}

【SpringBoot|SpringBoot JPA出现错误:No identifier specified for en解决方案】使用@javax.persistence.Id进行注解后，问题解决。

No identifier specified for entity: XXXX错误 在运行项目的时候报了下面的错误：

by: org.hibernate.AnnotationException: No identifier specified for entity: com.example1.demo1.Entity.User
at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:266) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:211) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:731) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:249) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:222) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:265) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]

原因及其解决
这是因为在实体的getID方法上没有加上此@Id注解，但是检查了一次确实加上了，最后的解决办法如下：
1.在数据库表对应实体（entity.java）的方法:getId()前加上该段文字注解

@Id@GeneratedValue(strategy= GenerationType.AUTO)

2.是因为id注解引错了包
错误的包路径：

import org.springframework.data.annotation.Id;

正确的包路径：

import javax.persistence.Id;

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

推荐阅读

• 

  婕珞芙晨露蔷薇面膜怎么样 婕路芙晨露蔷薇面膜可以分两次用吗
• 

  猪肉各部位的区别 猪肉哪个部位是一等肉
• 

  最早指南车发明人 指南车发明者
• 

  银天下行情分析系统软件下载
• 

  redis跳跃表查找数据的过程 redis哪块用到跳表
• 

  华为荣耀play3有没有指纹解锁（华为荣耀play3有指纹解锁吗）
• 

  amdk15支持什么cpu，amdk15主板支持的cpu
• 

  女性揉地筋的好处 主要有这些好处
• 

  汽车原厂互联映射什么意思
• 

  常年不在家冰箱怎么办？如何维护和保养？
• 

  怎样识别变频空调和定频空调 空调开一天多少钱
• 

  七绝（云水一梦惹东风）
• 

  新办企业个税申报密码 申报个税在哪个软件，企业个税能用手机申报吗
• 

  运动会通讯稿300字
• 

  美的SC861A吸尘器不充电的解决方法
• 

  刘海屏|iPhone 14强势曝光：是不是后悔手里的iPhone 13买早了？
• 

  iphone|从12999元跌至10488元，12G+512G，华为顶级旗舰现货供应不用抢购
• 

  绝地求生刺激战场国际服 绝地求生刺激战场国际服下载方法有哪些
• 

  无症状感染者会一直不发病吗
• 

  泰顺云雾茶是什么茶 泰顺雾云农庄

• 关于@Query注解的用法(Spring|关于@Query注解的用法(Spring Data JPA)
• springboot----二、Hello|springboot----二、Hello,SpringBoot！
• java|微信上传 wx.chooseMedia和wx.uploadFile使用，java springboot后端跑通
• SpringBoot|SpringBoot 入门（环境搭建与HelloWorld~）
• springboot如何获取yml里面的属性值
• 一篇文章带你了解Java|一篇文章带你了解Java SpringBoot Nacos
• 基于Java+SpringBoot+vue+element实现扶贫助农政策平台系统
• SpringBoot|SpringBoot 搭建基于 MinIO 的高性能存储服务
• 在SpringBoot项目中实现给所有请求加固定前缀
• springboot如何读取自定义属性