为什么休眠会抛出"no identifier specified"？

我正在尝试将数据插入我已将其附加屏幕截图的Oracle数据库中。在模型软件包中创建了一个实体类，其中包含所有列和一个表。附加的数据库详细信息中有一个ID列，该列是自动介入的。主要问题是使用@GeneratedValue(strategy = GenerationType.IDENTITY)使用自动增量数据来进行ID列的数据，这使我没有为此实体的详细信息指定以下错误的详细信息。因此，为此，创建了该实体类的对象和使用保存方法，我试图保存相同的对象，但由于该标识符的错误，它没有被保存。

这是我的实体类，其中包含表和列

package com.sid.demo.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
//import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import org.springframework.data.annotation.Id;
@Table(name="user_registration")  //this is a table present in my oracle database
@Entity
public class hindalco_model 
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY) //this is where problem exists
    @Column(name="user_id",updatable=false,nullable=false)
    private Long user_id;  //this is column a present in oracle database which is auto incremented
    @Column(name="user_name")
    private String user_name;
    @Column(name="email")
    private String email;
    @Column(name="password")
    private String password;
    public Long getUser_id() {
        return user_id;
    }
    public void setUser_id(Long user_id) {
        this.user_id = user_id;
    }
    public String getUser_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "hindalco_model [user_id=" + user_id + ", user_name=" + user_name + ", email=" + email + ", password="
                + password + "]";
    }       
}

这是我的控制器类

package com.sid.demo.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.sid.demo.model.hindalco_model;
import com.sid.demo.repository.hindalco_repository;
@RestController
@RequestMapping("/hindalco_user")
public class hindalco_controller 
{
    @Autowired
    hindalco_repository hindalco_repo;
    @RequestMapping(value="/user_registration",method = RequestMethod.GET, produces = {"application/json"})
    public hindalco_model user_registration(hindalco_model hindalco)
    {
        hindalco_repo.save(hindalco);
         return hindalco;
    }
}

//这是我的存储库类

package com.sid.demo.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.sid.demo.model.hindalco_model;
public interface hindalco_repository extends JpaRepository<hindalco_model,Integer>
{
}

//以下是我的数据库SQL查询，我已执行以自动增量。首先，我在评论行中创建了以下序列，然后触发自动增量

/*create sequence friend_auto start with 1 increment by 1;*/ create or replace trigger user_id before insert on user_registration for each row begin :new.user_id :=user_id.nextval; end;
附加了所有列的数据库屏幕截图详细信息在此处输入图像描述
以下是汇编时产生的错误

2019-02-27 18:30:09.076 INFO 7412 --- [ main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 2019-02-27 18:30:09.079 INFO 7412 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2019-02-27 18:30:09.080 INFO 7412 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1603 ms 2019-02-27 18:30:09.293 INFO 7412 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting... 2019-02-27 18:30:09.295 WARN 7412 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=oracle.jdbc.driver.OracleDriver was not found, trying direct instantiation. 2019-02-27 18:30:09.463 INFO 7412 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed. 2019-02-27 18:30:09.529 INFO 7412 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [ name: default ...] 2019-02-27 18:30:09.700 INFO 7412 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.4.0.Final} 2019-02-27 18:30:09.701 INFO 7412 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found 2019-02-27 18:30:09.850 INFO 7412 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.0.Final} 2019-02-27 18:30:10.037 INFO 7412 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.Oracle12cDialect 2019-02-27 18:30:10.254 INFO 7412 --- [ main] org.hibernate.type.BasicTypeRegistry : HHH000270: Type registration [byte[]] overrides previous : org.hibernate.type.BinaryType@59696551 2019-02-27 18:30:10.254 INFO 7412 --- [ main] org.hibernate.type.BasicTypeRegistry : HHH000270: Type registration [[B] overrides previous : org.hibernate.type.BinaryType@59696551 2019-02-27 18:30:10.255 INFO 7412 --- [ main] org.hibernate.type.BasicTypeRegistry : HHH000270: Type registration [Byte[]] overrides previous : org.hibernate.type.WrapperBinaryType@17273273 2019-02-27 18:30:10.255 INFO 7412 --- [ main] org.hibernate.type.BasicTypeRegistry : HHH000270: Type registration [[Ljava.lang.Byte;] overrides previous : org.hibernate.type.WrapperBinaryType@17273273 2019-02-27 18:30:10.313 WARN 7412 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 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.sid.demo.model.hindalco_model 2019-02-27 18:30:10.313 INFO 7412 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated... 2019-02-27 18:30:10.327 INFO 7412 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed. 2019-02-27 18:30:10.330 INFO 7412 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat] 2019-02-27 18:30:10.345 INFO 7412 --- [ main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2019-02-27 18:30:10.355 ERROR 7412 --- [ main] o.s.boot.SpringApplication : 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.sid.demo.model.hindalco_model at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1762) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.3.RELEASE.jar:2.1.3.RELEASE] at com.sid.demo.SpringBootJpaApplication.main(SpringBootJpaApplication.java:10) [classes/:na] Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.sid.demo.model.hindalco_model at org.hibernate.cfg.InheritanceState.determineDefaultAccessType(InheritanceState.java:266) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:211) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:785) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:250) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:231) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:274) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:903) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:934) ~[hibernate-core-5.4.0.Final.jar:5.4.0.Final] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1821) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE] ... 16 common frames omitted
一个
以下的确切错误
org.springframework.beans.factory.factory.beancreationexception：错误创建使用名称" EntityManagerFactory"的BEAN在类路径资源[org/springframework/boot/autoconfigure/ofoconfigure/orm/jpa/jpa/jpa/jbernatejpaconfiguration.class]：Init of Init Meatage;嵌套异常是org.hibernate.annotationException：未针对实体指定标识符：com.sid.demo.model.hindalco_model

在 hindalco_model中您用 org.springframework.data.annotation.Id注释的user_id，但应为 javax.persistance.Id。

用

在第9行中更改导入

import javax.persistance.Id;

还请注意，您将Monel ID定义为tye，而在hindalco_repository中，您将其设置为整数。

将JpaRepository<hindalco_model,Integer>更改为JpaRepository<hindalco_model, Long>

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