Spring MVC休眠會話錯誤

Question

我正在嘗試使用Hibernate與彈簧&執行用戶註冊操作。這裏是代碼

@Repository 
@Transactional(value = "myTransactionManager") 
public class UserFunctionsDAOImpl implements UserFunctionsDAO { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public void setSessionFactory(SessionFactory sessionFactory) 
    { 
     this.sessionFactory = sessionFactory; 
    } 

    @Override 
    public String registerUser(Users user) { 
     // TODO Auto-generated method stub 

     Query query = this.sessionFactory.getCurrentSession().createQuery("SELECT COUNT(*) FROM Users WHERE emailID = :email_ID OR mobileNo = :mobile_No"); 
     query.setString("email_ID", user.getEmailID()); 
     query.setString("mobile_No", user.getMobileNo()); 

     if(((long)query.uniqueResult()) > 0) 
      return "Email or Mobile number already exists"; 
     else 
     { 
      user.setUsetType("u"); 
      Session session = this.sessionFactory.getCurrentSession(); 
      session.beginTransaction(); 
      session.save(user); 
      session.getTransaction().commit(); 
      session.close(); 

      return "User Registered Successfully"; 
     } 
    } 

} 

在上面的代碼中，我得到了錯誤

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.TransactionException: nested transactions not supported 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:979) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 

root cause 

org.hibernate.TransactionException: nested transactions not supported 
    org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:154) 
    org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1471) 
    com.pir.dao.UserFunctionsDAOImpl.registerUser(UserFunctionsDAOImpl.java:49) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) 
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) 
    com.sun.proxy.$Proxy620.registerUser(Unknown Source) 
    com.pir.service.UserFunctionsServiceImpl.registerUser(UserFunctionsServiceImpl.java:36) 
    com.pir.controller.RegisterController.addUserController(RegisterController.java:63) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 

如何消除這種錯誤？

Answer 1

@Transactional註釋在這裏是錯誤的。 Spring將代理你的@Repository Bean來包裝啓動新Transaction的代碼中的所有公共函數。

因此，調用該方法將在Spring Proxy內部創建一個事務，然後嘗試用自己的代碼啓動另一個事務。

要解決這個問題，您可以自己開始另一個事務，只使用Spring提供的事務，或者將@Transactional移至實際需要的方法，而不是類中的每個公共方法。