Я разрабатывал простое приложение для загрузки весны, которое извлекает и вставляет данные в базу данных, созданную с помощью Workbench MySql. Я продолжаю получать ошибку ниже.
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2018-09-14 11:35:14.282 ERROR 11268 --- [ 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.MappingException: class demo.fabric.Employee not found while looking for property: id at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1699) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:573) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1089) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:859) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE] at com.example.studentInfo.StudentOnlineInfoApplication.main(StudentOnlineInfoApplication.java:10) [classes/:na] Caused by: org.hibernate.MappingException: class demo.fabric.Employee not found while looking for property: id at org.hibernate.internal.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:220) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:482) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.source.internal.hbm.ModelBinder.bindSimpleEntityIdentifier(ModelBinder.java:726) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.source.internal.hbm.ModelBinder.bindEntityIdentifier(ModelBinder.java:350) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.source.internal.hbm.ModelBinder.bindRootEntity(ModelBinder.java:245) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.source.internal.hbm.ModelBinder.bindEntityHierarchy(ModelBinder.java:192) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.source.internal.hbm.HbmMetadataSourceProcessorImpl.processEntityHierarchies(HbmMetadataSourceProcessorImpl.java:144) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:218) ~[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] at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1695) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE] ... 16 common frames omitted Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [demo.fabric.Employee] at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:348) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at org.hibernate.internal.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:216) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] ... 33 common frames omitted Caused by: java.lang.ClassNotFoundException: Could not load requested class : demo.fabric.Employee at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:336) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_161] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_161] at java.lang.Class.forName0(Native Method) ~[na:1.8.0_161] at java.lang.Class.forName(Unknown Source) ~[na:1.8.0_161] at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:345) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] ... 34 common frames omitted
Ниже представлен мой файл POM.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example.studentInfo</groupId>
<artifactId>studentOnlineInfo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>studentOnlineInfo</name>
<description>A web project which implements simple write and read to the database</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Вот мой файл application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/studentInfo
spring.datasource.username=root
spring.datasource.password=Christensen001
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.show-sql=true
spring.mvc.view.prefix=/WEB-INF/jsps/
spring.mvc.view.suffix=.jsp
Это мой класс Entity
package com.example.studentInfo.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="studenData")
public class StudentInformation {
@Id
private long id;
@Column(name="sreg_num")
private String reg_num;
@Column(name="semail")
private String email;
@Column(name="sname")
private String name;
@Column(name="sage")
private int age;
@Column(name="sstate")
private String state;
@Column(name="scity")
private String city;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getReg_num() {
return reg_num;
}
public void setReg_num(String reg_num) {
this.reg_num = reg_num;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public StudentInformation(long id, String reg_num, String email, String name, int age, String state, String city) {
super();
this.id = id;
this.reg_num = reg_num;
this.email = email;
this.name = name;
this.age = age;
this.state = state;
this.city = city;
}
@Override
public String toString() {
return "StudentInformation [id=" + id + ", reg_num=" + reg_num + ", email=" + email + ", name=" + name
+ ", age=" + age + ", state=" + state + ", city=" + city + "]";
}
} </pre>
studentInfoApplication.java
package com.example.studentInfo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class StudentOnlineInfoApplication {
public static void main(String[] args) {
SpringApplication.run(StudentOnlineInfoApplication.class, args);
}
}
Как это решить?
Обновить
Шаг 1: Вероятно, коррумпированная загрузка. Попробуйте удалить файл ~/.m2/respository и запустите mvn clean install
Если он не работает, он рекомендует создать новый проект из SPRING INITIALIZR со всеми необходимыми зависимостями.
Если это даже не работает, рекомендуется порекомендовать переустановить среду IDE, так как могут возникнуть некоторые проблемы при ее установке/кешировании.
Ваша сущность кажется прекрасной загрузкой, поскольку я пытался с той же конфигурацией Spring Boot. поэтому кажется, что проблема заключается в сопоставлении между вашей таблицей mysql и сущностью, поэтому проверьте, что у вас есть id как первичный ключ, определенный в таблице.
или лучше использовать ниже свойство в application.properties, чтобы автоматически создавать свои таблицы в первый раз. Вы можете обновить это свойство до none
spring.jpa.hibernate.ddl-auto=create
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL57Dialect
Просто предложение управлять конфигурацией идентификатора, как это для первичного ключа.
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
Обновить
Удалить @Autowired
from StudentsController.java
Удалите зависимостей tomcat-embed-core
поскольку уже добавлена его аннотация.
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<scope>provided</scope>
</dependency>
Теперь запустите свою базу кода.
Could not load requested class : demo.fabric.Employee
. Сделайте класс видимым в пути к классам, возможно ...