我使用@EnableTransactionManagement
运行Sping Boot 应用程序,并希望使用@Transactional(readOnly = true)
进行一些数据库查询。
但是我收到了一个令人困惑的错误消息。我正在使用Spring,Sping 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,然后立即关闭它,但出现了一个异常,即我想执行一个没有周围事务的流查询方法。
1条答案
按热度按时间7rtdyuoh1#
我修好了!
这是一个问题与Spring的背景。
当我初始化MyBeanService时,我将bean存储到一个带有相应请求对象的HashMap中。
当我在spring上下文中搜索bean时,它工作了: