Question

我确实有一个实体Root

@Entity
public class Root {
    @Id
    String id;

    @ElementCollection
    @CollectionTable
    List<Col> cols ;

收集物品＆＃39; Col＆＃39;有一个嵌入对象本身

@Embeddable
public class Col {

    @Embedded
    private Emb emb;

＆＃39; Emb＆＃39;对象非常简单

@Embeddable
public class Emb {

    String embField;

我希望数据库表就像那样

表：ROOT 字段：ID

表：ROOT_COLS 字段：ROOT_ID，EMB_FIELD

启动这个Spring Boot应用程序会给我一个ArrayIndexOutOfBoundsException

如何解决此问题？

hibernate版本：5.0.12

org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; entityManagerFactory＆＃39;的bean时出错在类路径资源中定义[org / springframework / boot / autoconfigure / orm / jpa / HibernateJpaAutoConfiguration.class]：调用init方法失败;嵌套异常是javax.persistence.PersistenceException：[PersistenceUnit：default]无法构建Hibernate SessionFactory 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1628）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java：555）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.getBean（AbstractApplicationContext.java:1081）〜[spring-context-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:856）〜[spring-context-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:542）〜[spring-context-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh（EmbeddedWebApplicationContext.java:122）〜[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在org.springframework.boot.SpringApplication.refresh（SpringApplication.java:737）[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在org.springframework.boot.SpringApplication.refreshContext（SpringApplication.java:370）[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:314）[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:1162）[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:1151）[spring-boot-1.5.2.RELEASE.jar：1.5.2.RELEASE] 在ch.admin.estv.map.Application.main（Application.java:33）[classes /：na] 引起：javax.persistence.PersistenceException：[PersistenceUnit：default]无法构建Hibernate SessionFactory 在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException（EntityManagerFactoryBuilderImpl.java:954）〜[hibernate-entitymanager-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build（EntityManagerFactoryBuilderImpl.java:882）〜[hibernate-entitymanager-5.0.12.Final.jar：5.0.12.Final] 在org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory（SpringHibernateJpaPersistenceProvider.java:60）〜[spring-orm-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory（LocalContainerEntityManagerFactoryBean.java:353）〜[spring-orm-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory（AbstractEntityManagerFactoryBean.java:370）〜[spring-orm-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet（AbstractEntityManagerFactoryBean.java:359）〜[spring-orm-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods（AbstractAutowireCapableBeanFactory.java:1687）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1624）〜[spring-beans-4.3.7.RELEASE.jar：4.3.7.RELEASE] ...省略了16个常用帧引起：org.hibernate.MappingException：无法实例化集合persister org.hibernate.persister.collection.BasicCollectionPersister 在org.hibernate.persister.internal.PersisterFactoryImpl.createCollectionPersister（PersisterFactoryImpl.java:167）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.persister.internal.PersisterFactoryImpl.createCollectionPersister（PersisterFactoryImpl.java:140）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.internal.SessionFactoryImpl。（SessionFactoryImpl.java:399）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.boot.internal.SessionFactoryBuilderImpl.build（SessionFactoryBuilderImpl.java:444）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build（EntityManagerFactoryBuilderImpl.java:879）〜[hibernate-entitymanager-5.0.12.Final.jar：5.0.12.Final] ...省略了22个常用帧引起：java.lang.ArrayIndexOutOfBoundsException：1 在org.hibernate.persister.collection.AbstractCollectionPersister.initCollectionPropertyMap（AbstractCollectionPersister.java:1914）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.persister.collection.AbstractCollectionPersister.initCollectionPropertyMap（AbstractCollectionPersister.java:1891）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.persister.collection.AbstractCollectionPersister。（AbstractCollectionPersister.java:592）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] 在org.hibernate.persister.collection.BasicCollectionPersister。（BasicCollectionPersister.java:57）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method）〜[na：1.8.0_121] at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）〜[na：1.8.0_121] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）〜[na：1.8.0_121] at java.lang.reflect.Constructor.newInstance（Constructor.java:423）〜[na：1.8.0_121] 在org.hibernate.persister.internal.PersisterFactoryImpl.createCollectionPersister（PersisterFactoryImpl.java:152）〜[hibernate-core-5.0.12.Final.jar：5.0.12.Final] ...省略了26个常见帧

Answer 1

问题是实体的默认访问权限是字段，但对于嵌入对象，默认访问权限是属性。

所以Col类应该是

@Embeddable
@Access(AccessType.FIELD)
public class Col {
    @Embedded
    private Emb emb;

和Emb类

@Embeddable
@Access(AccessType.FIELD)
public class Emb {
    String embField;

我会喜欢更好的错误消息然后是ArrayIndexOutOfBoundsException！

映射多级嵌入式集合会导致异常

1 个答案: