Question

我花了一天时间试图解决这个问题，并最终不得不转向stackoverflow以获得专家建议。

我使用java设置spring配置，有两个数据源和两个LocalContainerEntityManagerFactoryBean，如下所示。但默认情况下，Spring似乎寻找entityManagerFactory（）并抛出异常（包括下面的stacktrace）。如何配置spring以使用我的entitymanagerfactories而不是默认名称。

@Bean(name="visionDataSource")
public DataSource visionDataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    // set properties..
    return dataSource;
}

@Bean(name="stormDataSource")
public DataSource visionDataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    // set properties..
    return dataSource;
}

  @Bean(name="visionentityManagerFactory")
public LocalContainerEntityManagerFactoryBean visionentityManagerFactory() {
    LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactoryBean.setDataSource(visionDataSource());
    //entityManagerFactoryBean.setPersistenceUnitManager(persistenceUnitManager());
    //entityManagerFactoryBean.setPersistenceXmlLocation(null);
    entityManagerFactoryBean.setPersistenceUnitName("visionEntityManagerFactory");
    entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistence.class);
    entityManagerFactoryBean.setPackagesToScan(env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
    entityManagerFactoryBean.setJpaProperties(hibProperties());
    entityManagerFactoryBean.afterPropertiesSet();
    System.out.println("*********************visionEntityManagerFactory********************");
    return entityManagerFactoryBean;
}

 @Bean(name="stormEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean stormEntityManagerFactory() {
    entityManagerFactoryBean.setDataSource(stormDataSource());
    // set other properties
    return entityManagerFactoryBean;
  }

错误日志：

引起：org.springframework.beans.factory.BeanCreationException：创建名为'（内部bean）＃1'的bean时出错：在设置构造函数参数时无法解析对bean'entalManagerFactory'的引用;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：没有定义名为'entityManagerFactory'的bean 在org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference（BeanDefinitionValueResolver.java:329）在org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary（BeanDefinitionValueResolver.java:107）在org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments（ConstructorResolver.java:616）在org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod（ConstructorResolver.java:441）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod（AbstractAutowireCapableBeanFactory.java:1015）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（AbstractAutowireCapableBeanFactory.java:911）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:485）在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:456）在org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean（BeanDefinitionValueResolver.java:271） ... 51更多

引起：org.springframework.beans.factory.NoSuchBeanDefinitionException：没有定义名为'entityManagerFactory'的bean at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition（DefaultListableBeanFactory.java:549）在org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition（AbstractBeanFactory.java:1095）在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:277）在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:193）在org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference（BeanDefinitionValueResolver.java:323） ... 59更多

更新：我正在使用JPARepository

  public interface ContactRepository extends JpaRepository<Contact, Serializable> {
    List<Contact> findByCompanyId(int companyId);
  }

我已经尝试扩展一个自定义存储库注入实体管理器，如下所示。但这也无济于事。

  public interface ContactRepository extends DefaultRepository<Contact, Serializable> {
    List<Contact> findByCompanyId(int companyId);
   }

@NoRepositoryBean
public class DefaultRepositoryImpl<T, ID extends Serializable> extends SmpleJpaRepository<T, ID> implements 
                        DefaultRepository<T,ID> {

@PersistenceContext(unitName="visionEntityManagerFactory")
private EntityManager entityManager;

/**
 * @param domainClass
 * @param em
 */
 public DefaultRepositoryImpl(Class<T> domainClass, EntityManager em) {
 super(domainClass, em);
 }

 /**
  * {@inheritDoc}
  */
 protected Object getTargetRepository(RepositoryMetadata metadata) {
     return new DefaultRepositoryImpl<T, ID>((Class<T>) metadata.getDomainType(), entityManager);
 }
 /**
  * {@inheritDoc}
  */
 protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
     return DefaultRepository.class;
     }
  }

Answer 1

一种可能的解决方案。

public class MyRepositoryImpl extends JdbcDaoSupport implements MyRepository {

    @Qualifier("odsDataSource")
    @Autowired(required = true)
    private DataSource ds;

    public MyRepositoryImpl() {
    }

    @PostConstruct
    void postConstruct() {
        setDataSource(ds);
    }

    ...
}

如果通过扩展JdbcDaoSupport（以及其他一些Spring提供的帮助程序）来开发存储库，那么它们将默认尝试在默认的“entityManagerFactory”上按名称连接。因此，您需要通过注入备用命名的数据bean来初始化它们。

假设您使用JPA的另一种可能性。

@Repository
public class MyRepositoryImpl implements MyRepository {
    @PersistenceContext(unitName="MyPersistenceUnit")
    private EntityManager entityManager;

    public List<MyModel> findAll() {
        return entityManager.createNamedQuery("MyModel.findAll").getResultList();
    }
}

更新：对于最近遇到此问题的人，使用Spring Boot和Spring Data JPA，我写了一篇博文，其中介绍了实现这项工作的基本要点：http://scattercode.co.uk/2016/01/05/multiple-databases-with-spring-boot-and-spring-data-jpa/

Spring Java配置没有定义名为“entityManagerFactory”的bean

1 个答案: