当传播设置为Propagation.NOT_SUPPORTED时，Hibernate和TransactionRequiredException

本文介绍了当传播设置为Propagation.NOT_SUPPORTED时，Hibernate和TransactionRequiredException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述

 @Transactional（propagation = Propagation.NOT_SUPPORTED）注释的服务方法 code  
  Hibernate 5.0.4.Final：一切按预期工作（方法在没有事务的情况下执行）
 
 Hibernate 5.2.5。最后： javax.persistence.TransactionRequiredException：没有事务正在进行被抛出
 
 作为这个问题的测试用例我创建了一个简单的maven web应用程序和代码中的唯一更改（从旧的工作项目复制粘贴）是在pom.xml中的Hibernate版本bump ： 
 
  
   $ b $    b 
 
 
 代码片段（Spring用作主框架）： 
 
 
 DAO：
  @Repository 
 public class UrlDaoImpl implements UrlDao {
 $ b $ @Autowired 
 private SessionFactory sessionFactory; 
 
 @Override 
公开列表< Url> getAllUrls（）{
 Session session = sessionFactory.getCurrentSession（）; 
 Query query = session.createQuery（from Url）; 
返回query.list（）; 
} 
 
} 
  
服务：
  @Service 
 public class UrlServiceImpl implements UrlService {
 $ b $ @Autowired $ b $ private UrlDao urlDao; 
 
 
 @覆盖
 @Transactional //在新的HIBERNATE中执行此操作
公开列表< Url> getAllUrls（）{
 return urlDao.getAllUrls（）; 
} 
 
 @覆盖
 @Transactional（传播= Propagation.NOT_SUPPORTED）//这用来工作，但现在抛出异常
公开列表与LT; URL> getAllUrlsNoTxn（）{
 return urlDao.getAllUrls（）; 
} 
 
} 
  
控制器：
  @Controller 
公共类HomeController {
 $ b $ @Autowired 
私人UrlService urlService; 
 
 @RequestMapping（value =/，method = RequestMethod.GET，produce =text / plain）
 public String entryPoint（）{
 
 urlService .getAllUrls（）; 
 System.out.println（--------------------- ok）; 
返回ok; 
 
 
 @RequestMapping（value =/ no-txn，method = RequestMethod.GET，produce =text / plain）
 public String entryPointNoTxn（）{
 
 //例外情况将在以下
 urlService.getAllUrlsNoTxn（）; 
 System.out.println（--------------------- ok no txn）; 
返回ok no txn; 
} 
 
} 
  
 Stacktrace for new Hibernate ： 
 
 
 例外
 
 org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是javax.persistence.TransactionRequiredException：没有事务正在进行中
 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）
组织。 springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:197）
 org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）
 
根本原因
 
 javax.persistence.TransactionRequiredException：没有事务在进行中
 org.hibernate.internal.SessionImpl.checkTransactionNeeded（Sess org.hibernate.internal.SessionImpl.flush（SessionImpl.java:1406）
 org.hibernate.internal.SessionImpl.doFlush（SessionImpl.java:1410）
 org.hibernate.internal.SessionImpl.flush 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.transactio n.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： 
 com.sun.proxy。$ Proxy32.getAllUrlsNT（Unknown Source）
 com.example.web.controller.HomeController.entryPointNoTxn（HomeController.java:31）
 sun.reflect。 NativeMethodAccessorImpl.invoke0（本地方法）
 sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 java.lang 。反映.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.doSer （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）
的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）
  
 
 
解决方案
好的，在尝试不同的配置几小时之后（在将这个问题发布到SO之前），我终于找到了解决方案。 b 
 $ b 
对于新的Hibernate版本，有一个如果你想执行一个没有事务的方法，必须在 @Transactional 上声明其他必须的参数： readOnly = true  。所以服务部分的工作示例是： 
 
 
  @Service 
 public class UrlServiceImpl implements UrlService {
 
 @Autowired 
私人UrlDao urlDao; 
 
 
 @Override 
 @Transactional 
公开列表< Url> getAllUrls（）{
 return urlDao.getAllUrls（）; 
} 
 
 @覆盖
 @Transactional（readOnly的=真，传播= Propagation.NOT_SUPPORTED）// ADDED READONLY参加工作，新的Hibernate VERSIONS 
公开列表与LT; URL> ; getAllUrlsNoTxn（）{
 return urlDao.getAllUrls（）; 
} 
 
} 
  
我也证实了这一点调用（（org.hibernate.engine.transaction.internal.TransactionImpl）session.getTransaction（））。isActive（）; 返回 true对于第二个Service方法（带有事务）和 false ，第二个Service方法（带有Propagation.NOT_SUPPORTED）。
 
TL;DR:
Service method annotated with @Transactional(propagation = Propagation.NOT_SUPPORTED)
Hibernate 5.0.4.Final: everything works as expected (method is executed without transaction)
Hibernate 5.2.5.Final: javax.persistence.TransactionRequiredException: no transaction is in progress is thrown
as a testcase for this issue I created a simple maven web app and the only change made in code (copy-paste from old working project) was Hibernate version bump in pom.xml
Question:
What is the proper way to execute service methods without transaction nowadays?
Code snippets (Spring used as a main framework):
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();
    }

}
Service:
@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();
    }

}
Controller:
@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";
    }

}
Stacktrace for the exception in new Hibernate:
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)
 解决方案 
Ok, after few hours of trying different configurations (before posting this question to SO), I finally found the solution.
For new Hibernate versions there is another required parameter that must be declared on @Transactional if you want to execute a method without a transaction: readOnly = true. So the working example of the Service part is:
@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();
    }

}
I also confirmed that this works on debug by calling ((org.hibernate.engine.transaction.internal.TransactionImpl) session.getTransaction()).isActive(); which returns true for the first Service method (with transaction) and false for the second Service method (with Propagation.NOT_SUPPORTED).
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