java - 错误 500 : org. hibernate.HibernateException:未找到当前线程的 session

Question

这个问题已经有答案了:

Spring and hibernate: No Session found for current thread (6 个回答)

已关闭 4 年前。

当我尝试在项目中上传图片时收到此错误。该项目执行得很好，直到它必须有效地将图片上传到数据库(我使用的是 postgresql)，但最后一步永远不会起作用。

考虑了以下答案后更新了以下代码。

这是我的 Controller (其中一部分):

@Autowired
private FileUploadImpl fileUploadImpl;

...

@RequestMapping(value = "publish4" ,method = RequestMethod.POST)
public ModelAndView publish4(@Valid @ModelAttribute("fourthPublicationForm") final FourthPublicationForm form, final BindingResult errors,
                             @RequestParam("type") String type, @RequestParam("operation") String operation , @RequestParam CommonsMultipartFile[] fileUpload) {
    if (errors.hasErrors()) {
        //return helloPublish3(form,operation,type);
    }
    System.out.println("operation: "+ operation);
    System.out.println("type: "+ type);
    ps.create(form.getTitle(), form.getAddress(), operation, form.getPrice(), form.getDescription(), 
            type, form.getBedrooms(), form.getBathrooms(), form.getFloorSize(), form.getParking());

    if (fileUpload != null && fileUpload.length > 0) {
        for (CommonsMultipartFile aFile : fileUpload){

            System.out.println("Saving file: " + aFile.getOriginalFilename());

            UploadFile uploadFile = new UploadFile();
            uploadFile.setAddress(form.getAddress());
            uploadFile.setData(aFile.getBytes());
            fileUploadImpl.save(uploadFile);               
        }
    }
    return new ModelAndView("redirect:/hello/home");
}

这是界面中的fileUploadDao:

public interface FileUploadDao {
   void save(UploadFile uploadFile);
}

这是在服务中:

@Service
public class FileUploadImpl {

    @Autowired
    private FileUploadDao fileUploadDao;

    public FileUploadImpl() {
    }

    @Transactional
    public void save(UploadFile uploadFile) {
        fileUploadDao.save(uploadFile);
    }

}

坚持以下几点:

@Repository
public class FileUploadDAOImpl implements FileUploadDao {
    @Autowired
    private SessionFactory sessionFactory;

    public FileUploadDAOImpl() {
    }

    public FileUploadDAOImpl(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }


    public void save(UploadFile uploadFile) {
       sessionFactory.getCurrentSession().save(uploadFile);
    }
}

我在 WebConfig.java 中得到了这个(以及其他东西)

@Bean
public LocalSessionFactoryBean sessionFactory() {
   LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
   sessionFactory.setDataSource(dataSource());
   sessionFactory.setPackagesToScan(
       new String[] { "ar.edu.itba.paw" }
   );
   //sessionFactory.setHibernateProperties(hibernateProperties());

   return sessionFactory;
}

@Autowired
@Bean(name = "fileUploadDao")
public FileUploadDao getUserDao(SessionFactory sessionFactory) {
    return new FileUploadDAOImpl(sessionFactory);
}

@Bean(name = "multipartResolver")
public CommonsMultipartResolver getCommonsMultipartResolver() {
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(20971520);   // 20MB
    multipartResolver.setMaxInMemorySize(1048576);  // 1MB
    return multipartResolver;
}

@Bean
@Autowired
public HibernateTransactionManager transactionManager(
    SessionFactory sessionFactory) {
    HibernateTransactionManager txManager = new HibernateTransactionManager();
    txManager.setSessionFactory(sessionFactory);
    return txManager;
}

稍微多一点的错误:

org.hibernate.HibernateException: No Session found for current thread
at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:106)
at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:1014)
at ar.edu.itba.paw.persistence.FileUploadDAOImpl.save(FileUploadDAOImpl.java:25)
at ar.edu.itba.paw.webapp.controller.HelloWorldController.publish4(HelloWorldController.java:260)

我见过其他问题，其答案是缺乏“事务性”的使用。我在这里使用该注释，但我不确定它是否 100% 正确。

Answer 1

首先从FileUploadDAOImpl中删除@Transactional。

相应地更改基础包，

sessionFactory.setPackagesToScan(
   new String[] { "base.package.to.scan" } 
);

base.package.to.scan 似乎是无效的基础包命名，请将其更改为 ar.edu.itba.paw。

您需要一个事务管理器才能使用@Transactional。将其添加到WebConfig

@Bean
@Autowired
public HibernateTransactionManager transactionManager(
    SessionFactory sessionFactory) {
    HibernateTransactionManager txManager = new HibernateTransactionManager();
    txManager.setSessionFactory(sessionFactory());
    return txManager;
}

这可能会让这段代码工作，尝试一下。

更新:还要确保 WebConfig 类上存在以下注释，

@Configuration
@ComponentScan({"ar.edu.itba.paw"})
@EnableTransactionManagement(mode = AdviceMode.PROXY)
public class WebConfig {
    // code
}