我正在尝试将数据插入Oracle数据库，并为其附加了屏幕快照。在包含所有列和一个表的模型包中创建了一个实体类。在附加的数据库详细信息中，有一个id列会自动递增。主要问题是使用@GeneratedValue(strategy = GenerationType.IDENTITY)的id列的数据自动递增，这使我没有为此错误的该实体详细信息指定身份，如下所示。因此，为此创建了该实体类的对象，并尝试使用save方法保存该对象，但是由于该标识符出错，因此无法保存该对象。
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，在其中创建了上述实体类的对象
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，通过它我可以调用以实体类对象作为参数的保存方法
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>
{
}
//以下是我为自动增量执行的数据库SQL查询。首先，我在下面的注释行中创建了一个序列，然后触发自动递增
/*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快照详细信息 enter image description here
下面是编译时生成的错误
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.BeanCreationException：在类路径资源[org / springframework / boot / autoconfigure / orm / jpa / HibernateJpaConfiguration.class]中创建名称为'entityManagerFactory'的bean时出错：调用init方法失败；嵌套的异常是org.hibernate.AnnotationException：未为实体com.sid.demo.model.hindalco_model
指定标识符
答案 0 :(得分：2)
在hindalco_model中，您用org.springframework.data.annotation.Id注释了user_id，但应为javax.persistance.Id。
通过第9行更改导入
import javax.persistance.Id;
还要注意，您将monel id tye定义为Long，而在hindalco_repository中将其设置为Integer。
将JpaRepository<hindalco_model,Integer>更改为JpaRepository<hindalco_model, Long>