我得到以下错误：

org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有'javax.persistence.EntityManagerFactory'类型的限定bean可用：期望的单个匹配bean但找到4：D1EntityManager，D2EntityManager，BaseEntityManager，oldDbEntityManager

我在不同的文件中声明了这个模板后面的4个 EntityManagers ：

RepositoryConfigurationTemplate

@Configuration
@EnableJpaRepositories(
    basePackages = "...myReposPackages...",
    entityManagerFactoryRef = ConfigurationChanges.ENTITY_MANAGER_BEAN_NAME,
    transactionManagerRef = ConfigurationChanges.TRANSACTION_MANAGER_BEAN_NAME
)
@ComponentScan("...myScanPackages...")
@EnableConfigurationProperties
public class MyRepoConfigClass {
  ...
  ...
  public final static String ENTITY_MANAGER_BEAN_NAME = "...EntityManagerSingleConstant..."; // D1EntityManager / D2EntityManager / BaseEntityManager / oldDbEntityManager for different classes
  public final static String TRANSACTION_MANAGER_BEAN_NAME = "...TransactionManagerSingleConstant..."; // D1TransactionManager / D2TransactionManager / BaseTransactionManager / oldDbTransactionManager for different classes

  @Bean(name=ENTITY_MANAGER_BEAN_NAME)
  @Qualifier(ENTITY_MANAGER_BEAN_NAME) // Not sure if this is needed, I just added it trying to make it work
  public LocalContainerEntityManagerFactoryBean myClassEntityManager() {
    LocalContainerEntityManagerFactoryBean em
            = new LocalContainerEntityManagerFactoryBean();
    ... initializations ...
    em.setDataSource(...myDataSource...)
    em.setPackagesToScan("...EntitiesPackagesToScan...")

    em.setPersistenceUnitName(ENTITY_MANAGER_BEAN_NAME); // Not sure if this is needed, I just added it trying to make it work
  }

  @Bean(name=TRANSACTION_MANAGER_BEAN_NAME)
  @Qualifier(TRANSACTION_MANAGER_BEAN_NAME) // Not sure if this is needed, I just added it trying to make it work
  public PlatformTransactionManager myClassTransactionManager() {
    JpaTransactionManager transactionManager
            = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(
            myClassEntityManager().getObject());
    return transactionManager;
  }

}

我试图从 Services 引用它像这样：

ServiceTemplate

@Service
public class myServiceClass {

  @PersistenceContext(unitName = MyRepoConfigClass.ENTITY_MANAGER_BEAN_NAME) // Thought this might be the solution for JPA PersistenceContext, but did not work anyway
  @Qualifier(MyRepoConfigClasss.ENTITY_MANAGER_BEAN_NAME) // Not sure if this is supposed to be done like this. In normal spring boot components it works
  private EntityManager entityManager; // <- This injection fails

}

从我的角度来看，我正确定 EntityManger 应该使用 @PersistenceContext （ unitName ）或 @Qualifier

但是，正如错误所说，springboot不知道4 beans 中的哪一个使用 .

我错过了什么吗？

UPDATE

完整堆栈跟踪：

org.springframework.beans.factory.BeanCreationException：创建名为'changes'的bean时出错：持久性依赖项的注入失败;嵌套异常是org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有类型'javax.persistence.EntityManagerFactory'的限定bean可用：期望的单个匹配bean但在org.springframework.orm中找到5：D1EntityManager，D2EntityManager，BaseEntityManager，oldDbEntityManager，deviceApiGwDbConfigurationDbEntityManager org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean上的.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessPropertyValues（PersistenceAnnotationBeanPostProcessor.java：356）〜[spring-orm-5.0.9.RELEASE.jar：5.0.9.RELEASE]在Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:575）〜[spring]的AbstractAutowireCapableBeanFactory.java:1383)~ [spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] -beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireC） apableBeanFactory.java:498）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda $ doGetBean $ 0（AbstractBeanFactory.java:320） 〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:222)~ [spring-beans-5.1.2 .RELEASE.jar：5.1.2.RELEASE]在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:318）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2 . 在org.springframework.beans的org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:199）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE]中发布 . or.s.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（abst）中的factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:846）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] orct.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:550）〜[spring-context]中的ractApplicationContext.java:869)~ [spring-context-5.0.9.RELEASE.jar：5.0.9.RELEASE] -5.0.9.RELEASE.jar：5.0.9.RELEASE]在org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh（ServletWebServerApplicationContext.java:140）〜[spring-boot-2.0.5.RELEASE . jar：2.0.5.RELEASE]在org.springframework.boot上的org.springframework.boot.SpringApplication.refresh（SpringApplication.java:780）[spring-boot-2.0.5.RELEASE.jar：2.0.5.RELEASE] .SpringApplication.refreshContext（SpringApplication.java:412）[spring-boot-2.0.5.RELEASE.jar：2.0.5.RELEASE]在org.springframework.boot.SpringApplication.run（SpringApplication.java:333）[spring- boot-2.0.5.RELEASE.jar：2.0.5.RELEASE]在org.springframework.boot.SpringApplication.run（SpringApplication.java:1277）[spring-boot-2.0.5.RELEASE.jar：2.0.5 . 发布在org.springframework.boot.SpringApplication.run（SpringAppli阳离子.java：1265）[spring-boot-2.0.5.RELEASE.jar：2.0.5.RELEASE]在com.mycompany.device.api.gw.Application.main（Application.java:35）[classes /：导致：org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有类型'javax.persistence.EntityManagerFactory'的限定bean可用：期望的单个匹配bean但在org.springframework中找到5：D1EntityManager，D2EntityManager，BaseEntityManager，oldDbEntityManager，deviceApiGwDbConfigurationDbEntityManager org.springframework.beans.factory.support.DefaultListableBeanFactory中的.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean（DefaultListableBeanFactory.java:1139）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE] . 在org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findDefaultEntityManagerFactory（PersistenceAnnotationBeanPostProcessor.java：569）的resolveNamedBean（DefaultListableBeanFactory.java:1079）〜[spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE]〜 [ spring ORM-5.0.9.RELEASE.jar：5 . 0.9.RELEASE] at在org.springframework.orm.jpa.support上的org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findEntityManagerFactory（PersistenceAnnotationBeanPostProcessor.java:532）〜[spring-orm-5.0.9.RELEASE.jar：5.0.9.RELEASE] .PersistenceAnnotationBeanPostProcessor $ PersistenceElement.resolveEntityManager（PersistenceAnnotationBeanPostProcessor.java：700）〜[spring-orm-5.0.9.RELEASE.jar：5.0.9.RELEASE] at org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor $ PersistenceElement.getResourceToInject（在org.springframework.beans.factory.annotation.InjectionMetadata $ InjectedElement.inject（InjectionMetadata.java：180）中的PersistenceAnnotationBeanPostProcessor.java：673）〜[spring-orm-5.0.9.RELEASE.jar：5.0.9.RELEASE]〜 [spring-beans-5.1.2.RELEASE.jar：5.1.2.RELEASE]在org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:90）〜[spring-beans-5.1.2 . 位于org.springframework.orm.jpa.support.PersistenceAnnotationBeanPos的RELEASE.jar：5.1.2.RELEASE] tProcessor.postProcessPropertyValues（PersistenceAnnotationBeanPostProcessor.java：353）〜[spring-orm-5.0.9.RELEASE.jar：5.0.9.RELEASE] ...省略了17个常用帧

java spring spring-boot jpa