IdClass 未在类“Hello”中定义

Question

“我想从Hello类中获取用户Id的值给Hello世界的goldUser但是获取不到。获取@Idclass“没有为实体指定标识符：”错误。”

我做错了什么或者应该如何从 Hello 表中获取用户 ID 的值。

  @Entity
    @Table(name ="Greetings")
    class HelloWorld {

      @Id
      @IdClass(classOf[Hello])
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      @ManyToOne(fetch = FetchType.Lazy)
      @JoinColumn(name = "user_id")
      @BeanProperty
      var goldUser: Hello = _

      @Column(name = "morning")
      @BeanProperty
      var morning: Long = _

      @Column(name = "aftrnoon")
      @BeanProperty
      var afternoon: Long = _

    }"




    "@Entity
    @Table(name = "Hello")
    class Hello {
      @Id
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      @Column(name = "id")
      @BeanProperty
      var userId: Long = _
    }

"org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'goldEntityManager' defined in class path

资源 [in/happysellers/webapp/gold/GoldMorningConfig.class]： 调用 init 方法失败；嵌套异常是 org.hibernate.AnnotationException：没有为实体指定标识符： in.happysellers.webapp.gold.dotprints.DotPrints 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE] 引起：org.hibernate.AnnotationException：没有为实体指定标识符：in.happy.webapp.gold.greetingprints.HelloWorld 在 org.hibernate.cfg.InheritanceState.getElementsToProcess(InheritanceState.java:231) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:775) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies（AnnotationMetadataSourceProcessorImpl.java:250） ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies（MetadataBuildingProcess.java:231） ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:274) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata（EntityManagerFactoryBuilderImpl.java:904） ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:935) ~[hibernate-core-5.3.9.Final.jar:5.3.9.Final] 在 org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) ~[spring-orm-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) ~[spring-orm-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) ~[spring-orm-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods（AbstractAutowireCapableBeanFactory.java:1837） ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE] ...省略了21个常用框架"

Answer 1

你需要确保你import那个班级：

import javax.persistence.IdClass;