Hibernate和TransactionRequiredException當傳播設置爲Propagation.NOT_SUPPORTED

Question

TL; DR：註釋有@Transactional(propagation = Propagation.NOT_SUPPORTED)

休眠5.0.4.Final

• 服務方法：一切正常（在沒有事務執行方法）
• 休眠5.2.5.Final：javax.persistence.TransactionRequiredException: no transaction is in progress被拋出
• 作爲這個問題的測試用例我創建了一個簡單的maven web應用程序，並且在代碼（從舊工作項目複製粘貼）中做出的唯一更改是Hibernate版本bum p在pom.xml中

問：

• 什麼是執行服務方法，而如今交易的正確方法？

代碼片段（作爲主框架Spring）：

DAO：

@Repository 
public class UrlDaoImpl implements UrlDao { 

    @Autowired 
    private SessionFactory sessionFactory; 

    @Override 
    public List<Url> getAllUrls() { 
     Session session = sessionFactory.getCurrentSession(); 
     Query query = session.createQuery("from Url"); 
     return query.list(); 
    } 

} 

服務：

@Service 
public class UrlServiceImpl implements UrlService { 

    @Autowired 
    private UrlDao urlDao; 


    @Override 
    @Transactional // THIS WORKS IN NEW HIBERNATE 
    public List<Url> getAllUrls() { 
     return urlDao.getAllUrls(); 
    } 

    @Override 
    @Transactional(propagation = Propagation.NOT_SUPPORTED) // THIS USED TO WORK BUT NOW THROWS EXCEPTION 
    public List<Url> getAllUrlsNoTxn() { 
     return urlDao.getAllUrls(); 
    } 

} 

控制器：

@Controller 
public class HomeController { 

    @Autowired 
    private UrlService urlService; 

    @RequestMapping(value = "/", method = RequestMethod.GET, produces = "text/plain") 
    public String entryPoint() { 

     urlService.getAllUrls(); 
     System.out.println("--------------------- ok"); 
     return "ok"; 
    } 

    @RequestMapping(value = "/no-txn", method = RequestMethod.GET, produces = "text/plain") 
    public String entryPointNoTxn() { 

     // EXCEPTION WILL BE THROWN BELOW 
     urlService.getAllUrlsNoTxn(); 
     System.out.println("--------------------- ok no txn"); 
     return "ok no txn"; 
    } 

} 

堆棧跟蹤在新的Hibernate異常：

exception 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is javax.persistence.TransactionRequiredException: no transaction is in progress 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) 
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

root cause 

javax.persistence.TransactionRequiredException: no transaction is in progress 
    org.hibernate.internal.SessionImpl.checkTransactionNeeded(SessionImpl.java:3439) 
    org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1410) 
    org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1406) 
    org.springframework.orm.hibernate5.SessionFactoryUtils.flush(SessionFactoryUtils.java:144) 
    org.springframework.orm.hibernate5.SpringSessionSynchronization.beforeCommit(SpringSessionSynchronization.java:95) 
    org.springframework.transaction.support.TransactionSynchronizationUtils.triggerBeforeCommit(TransactionSynchronizationUtils.java:95) 
    org.springframework.transaction.support.AbstractPlatformTransactionManager.triggerBeforeCommit(AbstractPlatformTransactionManager.java:932) 
    org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:744) 
    org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730) 
    org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:504) 
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:292) 
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) 
    com.sun.proxy.$Proxy32.getAllUrlsNT(Unknown Source) 
    com.example.web.controller.HomeController.entryPointNoTxn(HomeController.java:31) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:498) 
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:220) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

Answer 1

好吧，嘗試不同的配置數小時後（發佈這個問題之前，SO），我終於找到了解決辦法。

對於新的Hibernate版本，如果要執行沒有事務的方法，必須在@Transactional上聲明另一個必需參數：readOnly = true。因此，服務部的工作的例子是：

@Service 
public class UrlServiceImpl implements UrlService { 

    @Autowired 
    private UrlDao urlDao; 


    @Override 
    @Transactional 
    public List<Url> getAllUrls() { 
     return urlDao.getAllUrls(); 
    } 

    @Override 
    @Transactional(readOnly = true, propagation = Propagation.NOT_SUPPORTED) // ADDED READONLY TO WORK IN NEW HIBERNATE VERSIONS 
    public List<Url> getAllUrlsNoTxn() { 
     return urlDao.getAllUrls(); 
    } 

} 

我也證實，這個工程在調試通過調用((org.hibernate.engine.transaction.internal.TransactionImpl) session.getTransaction()).isActive();這對於第一個服務方法返回true（含交易）和false第二服務方法（與傳播。不支持）。