java - Spring数据JPA : InvalidDataAccessApiUsageException for @Transactional

Question

我使用 @EnableTransactionManagement 运行 Spring Boot 应用程序，并希望使用 @Transactional(readOnly = true) 进行某些数据库查询。

但我收到一条令人困惑的错误消息。 我正在使用 Spring、Spring Boot 和 Spring Data JPA。

MySpringBootApplication.java

@SpringBootApplication
@EnableTransactionManagement
@ComponentScan("com.deutscheboerse.regrephub")
@EntityScan(basePackages = "com.deutscheboerse.regrephub")
@EnableJpaRepositories(basePackages = "com.deutscheboerse.regrephub")
@Slf4j
public class MySpringBootApplication
{
   ... Some @Autowired variables ...

   public static void main(String[] args)
   {
      SpringApplication.run(MySpringBootApplication.class, args);
   }

   ... 
}

MySpringBootApplicationConfiguration.java

@Configuration
@EnableEncryptableProperties
@EnableTransactionManagement
@EnableAsync
@Slf4j
public class MySpringBootApplicationConfiguration
{
   ... Some @Autowired variables ...

   @Bean
   @ConfigurationProperties(prefix = "spring.datasource")
   public DataSource dataSource()
   {
      return DataSourceBuilder
            .create(this.dataSourceProperties.getClassLoader())
            .url(this.dataSourceProperties.getUrl())
            .username(this.dataSourceProperties.getUsername())
            .password(this.dataSourceProperties.getPassword())
            .build();
    }

    ...
}

MyBeanDao.java

@Repository
public interface MyBeanDao extends JpaRepository<MyBeanData, Long>
{
    @QueryHints(value = @QueryHint(name = HINT_FETCH_SIZE, value = "" + Integer.MIN_VALUE))
    @Query(value = "SELECT * FROM MY_TABLE", nativeQuery = true)
    @Transactional(readOnly = true)
    Stream<MyBeanData> streamAll();
}

MyBeanService.java

@Service
@Slf4j
public class MyBeanService extends AbstractService
{
    @Autowired
    public MyBeanService(...)
    {
       ...
    }

    @Override
    @Transactional(readOnly = true, propagation = Propagation.SUPPORTS)
    public void handleRequest(Object request, Message msg)
    {
       try (Stream<MyBeanData> data = myBeanDao.streamAll())
       {
          ...
       }
       catch (Exception e)
       {
          ...
       }
    }
}

当我运行 SpringBootApplication 时，我将收到以下日志消息/错误:

[TransactionInterceptor:474] Getting transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.streamAll]
[TransactionInterceptor:517] Completing transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.streamAll] after exception: org.springframework.dao.InvalidDataAccessApiUsageException: You're trying to execute a streaming query method without a surrounding transaction that keeps the connection open so that the Stream can actually be consumed. Make sure the code consuming the stream uses @Transactional or any other way of declaring a (read-only) transaction.
[RuleBasedTransactionAttribute:131] Applying rules to determine whether transaction should rollback on org.springframework.dao.InvalidDataAccessApiUsageException: You're trying to execute a streaming query method without a surrounding transaction that keeps the connection open so that the Stream can actually be consumed. Make sure the code consuming the stream uses @Transactional or any other way of declaring a (read-only) transaction.
[RuleBasedTransactionAttribute:148] Winning rollback rule is: null
[RuleBasedTransactionAttribute:153] No relevant rollback rule found: applying default rules

首先 JPA 打开一个事务并立即关闭它，但有一个异常，我想在没有周围事务的情况下执行流式查询方法。 有人以前有过这个吗？!

Answer 1

我修好了!

这是 spring 上下文的问题。

当我初始化 MyBeanService 时，我将 bean 存储到具有相应请求对象的 HashMap 中。

dispatcher.put(MyBeanRequest.class, this);
...
((MyAbstractService) dispatcher.get(MyBeanRequest.class).handleRequest(...);

当我在 spring 上下文中搜索 bean 时，它起作用了:

dispatcher.put(MyBeanRequest.class, this.getClass());
...
((MyAbstractService) appContext.getBean(dispatcher.get(requestObject.getClass()))).handleRequest(...);