本文介绍了使用@OneToMany或@ManyToMany针对未映射的类异常发生的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在创建我的第一个Spring-Boot-Starter-data-jpa项目.我正在关注有关该主题的教程，并以相同的方式创建一个单独的应用程序.当我启动Spring Boot应用程序时，我得到
I am creating my first Spring-Boot-Starter-data-jpa project. I was following a tutorial on that and creating a separate application in same way. When I am starting my Spring Boot application , I am getting
我已经检查了同一问题的几个答案，并尝试解决但仍然出现相同的错误.请帮忙，因为我在这里一无所知.我主要有两个实体， student 和 PaymentRecord .一个学生可以有多个 PaymentRecords .
I have already checked few answers for the same issue and tried to resolve but still getting same error. Please help as i am clueless here.I have mainly two entities , student and PaymentRecord. One student can have multiple PaymentRecords.
学生班
package org.springboot.schoolmanagement.Entity;
import java.util.HashMap;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import com.school.management.system.Payment.PaymentRecord;
@Entity
@Table(name= "student")
public class Student {
@Id
private int id;
private String name;
private int age;
private int grade;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "student")
public Set<PaymentRecord> payments = null;//
public Set<PaymentRecord> getStudenPayments() {
return payments;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
public String getName() {
return name;
}
public Student(int id, String name, int age, int grade) {
super();
this.id = id;
this.name = name;
this.age = age;
this.grade = grade;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
PaymentRecord.java
PaymentRecord.java
package org.springboot.schoolmanagement.Entity;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name = "payments")
public class PaymentRecord {
@Id
private int paymentId;
@ManyToOne
@JoinColumn(name = "id")
private Student student;
private String month;
private int amount;
public PaymentRecord() {
}
public int getPaymentId() {
return paymentId;
}
public void setPaymentId(int paymentId) {
this.paymentId = paymentId;
}
public String getMonth() {
return month;
}
public void setMonth(String month2) {
this.month = month2;
}
public int getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
}
Pom.xml
<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>SchoolFinanceManagement</groupId>
<artifactId>SchoolManagement</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>SchoolFeesPaymentManagement</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- This is the only dependency required to enable our web application connect to the datbase -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- This is the only dependency required to enable our web application connect to the datbase -->
<!-- this is for for downloading the database to which our application connects -->
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<scope>runtime</scope>
</dependency>
<!-- this is for for downloading the database to which our application connects -->
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
</project>
控制台日志和堆栈跟踪:
Console log and stack trace:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.4.2.RELEASE)
2020-06-10 11:25:57.789 INFO 14744 --- [ main] o.s.schoolmanagement.Application : Starting Application on DESKTOP-EL3JT6U with PID 14744 (C:\Users\HP\JavaBasicProjects\SchoolManagement\target\classes started by HP in C:\Users\HP\JavaBasicProjects\SchoolManagement)
2020-06-10 11:25:57.813 INFO 14744 --- [ main] o.s.schoolmanagement.Application : No active profile set, falling back to default profiles: default
2020-06-10 11:25:58.195 INFO 14744 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@57c758ac: startup date [Wed Jun 10 11:25:58 PDT 2020]; root of context hierarchy
2020-06-10 11:26:05.777 INFO 14744 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$1f7adbdb] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-06-10 11:26:07.927 INFO 14744 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2020-06-10 11:26:07.973 INFO 14744 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2020-06-10 11:26:07.975 INFO 14744 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.6
2020-06-10 11:26:08.342 INFO 14744 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-06-10 11:26:08.351 INFO 14744 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 10148 ms
2020-06-10 11:26:08.860 INFO 14744 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2020-06-10 11:26:08.880 INFO 14744 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2020-06-10 11:26:08.894 INFO 14744 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2020-06-10 11:26:08.895 INFO 14744 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2020-06-10 11:26:08.895 INFO 14744 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2020-06-10 11:26:14.198 INFO 14744 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2020-06-10 11:26:14.959 INFO 14744 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2020-06-10 11:26:17.614 INFO 14744 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.0.11.Final}
2020-06-10 11:26:17.622 INFO 14744 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2020-06-10 11:26:17.629 INFO 14744 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2020-06-10 11:26:18.978 INFO 14744 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2020-06-10 11:26:25.233 INFO 14744 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.DerbyTenSevenDialect
2020-06-10 11:26:28.854 WARN 14744 --- [ main] ationConfigEmbeddedWebApplicationContext : 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/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: org.springboot.schoolmanagement.Entity.Student.payments[com.school.management.system.Payment.PaymentRecord]
2020-06-10 11:26:28.897 INFO 14744 --- [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat
2020-06-10 11:26:29.373 INFO 14744 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2020-06-10 11:26:29.409 ERROR 14744 --- [ main] o.s.boot.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: Use of @OneToMany or @ManyToMany targeting an unmapped class: org.springboot.schoolmanagement.Entity.Student.payments[com.school.management.system.Payment.PaymentRecord]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
at org.springboot.schoolmanagement.Application.main(Application.java:10) [classes/:na]
Caused by: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: org.springboot.schoolmanagement.Entity.Student.payments[com.school.management.system.Payment.PaymentRecord]
at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1191) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:794) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:719) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:54) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1655) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1623) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:278) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:847) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:874) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) ~[spring-orm-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) ~[spring-orm-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373) ~[spring-orm-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362) ~[spring-orm-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
... 16 common frames omitted
推荐答案
使用双向@OneToMany
Using Bidirectional @OneToMany
学生班
package org.springboot.schoolmanagement.Entity;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name= "student")
public class Student {
@Id
private int id;
private String name;
private int age;
private int grade;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "student",orphanRemoval = true)
public Set<PaymentRecord> payments = new HashSet();//
//Constructors, getters and setters removed for brevity
public void addPayment(PaymentRecord paymentRecord) {
payments.add(paymentRecord);
paymentRecord.setStudent(this);
}
public void removePayment(PaymentRecord paymentRecord) {
payments.remove(paymentRecord);
paymentRecord.setStudent(null);
}
}
PaymentRecord.java
PaymentRecord.java
package org.springboot.schoolmanagement.Entity;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name = "payments")
public class PaymentRecord {
@Id
private int paymentId;
@ManyToOne(fetch = FetchType.LAZY)
private Student student;
private String month;
private int amount;
//Constructors, getters and setters removed for brevity
}
我希望这会有所帮助.
这篇关于使用@OneToMany或@ManyToMany针对未映射的类异常发生的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！