java-@Async正在杀死休眠事务

我为我的REST API使用了Open-Session-In-View事务模型,如下所示：

@Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      sessionFactory.getCurrentSession().beginTransaction();
      chain.doFilter(request, response);
      sessionFactory.getCurrentSession().getTransaction().commit();
}

这项工作很好.我想添加@Async功能.所以我创建了：

@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {

    @Override
    @Bean(destroyMethod="shutdown")
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(18);
        executor.setMaxPoolSize(18);
        executor.initialize();
        executor.setDaemon(true);
        executor.setWaitForTasksToCompleteOnShutdown(false);
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SimpleAsyncUncaughtExceptionHandler();
    }
}

和：

@Component
public class AsyncMarketCaller {

    @Inject
    MarketManagerFactory marketManagerFactory;

    @Async
    public Future<List<Product>> getProducts(){

        MarketManager productManager = marketManagerFactory.obtainMarketManager(market);
        result = productManager.getProducts();
        ....
    }
}

productManager调用另一个@Service

@Service
public class DefaultIdentifierManager implements IdentifierManager{
     @Inject
    UpcEanDAO upcEanDAO;

      @Override
    public String getTitleForIdentifier(String identifier){
        UpcEan upcEan = upcEanDAO.find(identifier);
    }
}

但是,对于upcEanDAO.find(identifier)我得到一个例外：

Caused by: org.hibernate.HibernateException: get is not valid without active transaction

在添加@Async功能以对getProducts()进行异步调用之前,它工作得很好,因此我假设@Async杀死了我在Hibernate中打开的事务.

我尝试根据此处的另一个答案将@Transactional添加到以@Async注释的方法,但这无济于事.

任何想法？

已编辑

我编辑了代码,所以

@Component
public class AsyncMarketCaller {

    @Inject
    AsyncMarketService asyncMarketService;

    @Async
    public Future<List<Product>> getProducts(){
        asyncMarketService.getProducts();
    }
}

和

@Service
public class AsyncMarketService {

    @Inject
    MarketManagerFactory marketManagerFactory;

    @Transactional
    public Future<List<Product>> getProducts()
     ....
}

}

我在日志中看到

50689 DEBUG [localhost-startStop-1] org.springframework.transaction.annotation.AnnotationTransactionAttributeSource - Adding transactional method 'AsyncMarketService.getProducts' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''

但这没有帮助.请注意,我的方法AsyncMarketService.getProducts不会直接调用数据库,而是会调用其他方法,只有其中一个会进行调用.

我还添加了一个实际调用DB：@Transactional的函数

49992 DEBUG [localhost-startStop-1] org.springframework.transaction.annotation.AnnotationTransactionAttributeSource-添加事务方法’DefaultIdentifierManager.getTitleForIdentifier’,属性为：PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ”

解决方法:

休眠事务基于ThreadLocal工作.

当您将另一个线程与@Async一起使用时,将没有活动的事务.

您可以通过使异步方法调用另一个由@Transactional注释的bean来实现此功能.

在这里,我将进一步解释这种方法：
How do I properly do a background thread when using Spring Data and Hibernate?

标签：spring-transactions,asynchronous,hibernate,spring,java
来源： https://codeday.me/bug/20191028/1953152.html