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获取“找不到当前线程的会话”使用getCurrentSession（）时发生异常

本文介绍了获取“找不到当前线程的会话”使用getCurrentSession（）时发生异常的处理方法，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

我使用Spring MVC 4.0.6和Hibernate 4.3.5。我试图插入值到我的数据库表，但我得到这个错误信息：


$ b

HTTP状态500 - 请求处理失败;嵌套异常是org.hibernate.HibernateException：找不到当前线程的会话

目前我正在使用 sessionFactory。 getCurrentSession（）来保存我的数据，但是如果我使用 getSessionFactory（）。openSession（）; 它可以很好地工作。我听说我应该使用 getCurrentSession 而不是 getSessionFactory（）。openSession（）; ，因为它每创建一个新会话我可以做一个数据库查询。



请看下面的代码，告诉我我做错了什么，以及如何获取 sessionFactory.getCurrentSession （）工作？



GradeServiceImpl：
$ b @Service
@Transactional
public class GradeServiceImpl implements GradeService {
$ b $ @Autowired
Private GradeDao gradeDao;

@Override
public void addGrade（年级）{

gradeDao.addGrade（grade）;
}
}

GradeDaoImpl 

  @Repository 
 @Transactional 
 public class GradeDaoImpl implements GradeDao {
 
 @Autowired 
 private SessionFactory sessionFactory; 
 
 public SessionFactory getSessionFactory（）{
 return sessionFactory; 
} 
 
 public void setSessionFactory（SessionFactory sessionFactory）{
 this.sessionFactory = sessionFactory; 
} 
 @Override 
 public void addGrade（Grade grade）{
 
 sessionFactory.getCurrentSession（）。save（grade）; 
 
 
 
 
 $ b 
  servlet-context。 xml  
 <？xml version =1.0encoding =UTF-8？> 
< beans：beans xmlns：beans =http://www.springframework.org/schema/beansxmlns =http://www.springframework.org/schema/mvcxmlns：context = http://www.springframework.org/schema/contextxmlns：xsi =http://www.w3.org/2001/XMLSchema-instancexsi：schemaLocation =http://www.springframework.org/ schema / mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring -beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd\"> 
 
< annotation-driven /> 
< context：annotation-config /> 
< context：component-scan base-package =com.spring/> 
 
 
< resources mapping =/ resources / **location =/ resources //> 
 < beans：bean class =org.springframework.web.servlet.view.InternalResourceViewResolver> 
< beans：property name =prefixvalue =/ WEB-INF / views //> 
< beans：property name =suffixvalue =。jsp/> 
< / beans：bean> 
 
< beans：bean id =dataSourceclass =org.apache.commons.dbcp2.BasicDataSourcedestroy-method =close> 
< beans：property name =driverClassNamevalue =com.mysql.jdbc.Driver/> 
< beans：property name =urlvalue =jdbc：mysql：// localhost：3306 / java/> 
< beans：property name =usernamevalue =root/> 
< beans：property name =passwordvalue =/> 
< / beans：bean> 
 
< beans：bean id =messageSourceclass =org.springframework.context.support.ReloadableResourceBundleMessageSource> 
< beans：property name =basenamevalue =resources / messages/> 
< beans：property name =defaultEncodingvalue =UTF-8/> 
< / beans：bean> 
 
< beans：bean id =sessionFactoryclass =org.springframework.orm.hibernate4.LocalSessionFactoryBean> 
< beans：property name =dataSourceref =dataSource/> 
<！ - < beans：property name =configLocation> 
< beans：value> classpath：hibernate.cfg.xml< / beans：value> 
< / beans：property> - > 
< beans：property name =packagesToScanvalue =com.spring/> 
< beans：property name =hibernateProperties> 
< beans：道具> 
< beans：prop key =dialect> org.hibernate.dialect.MySQLDialect< / beans：prop> 
< beans：prop key =show_sql> true< / beans：prop> 
< beans：prop key =hibernate.hbm2ddl.auto> create< / beans：prop> 
< beans：prop key =hibernate.show_sql> true< / beans：prop> 
< / beans：道具> 
< / beans：property> 
< / beans：bean> 
 
< beans：bean id =transactionManagerclass =org.springframework.orm.hibernate4.HibernateTransactionManager> 
< beans：property name =sessionFactoryref =sessionFactory/> 
< / beans：bean> 
 
< / beans：beans> 
  
  Web.xml  
 <？xml version =1.0encoding =UTF-8？> 
< web-app xmlns =http://java.sun.com/xml/ns/javaeexmlns：xsi =http://www.w3.org/2001/XMLSchema-instance版本=2.5xsi：schemaLocation =http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd\"> 
 < context-param> 
< param-name> contextConfigLocation< / param-name> 
< param-value> /WEB-INF/spring/root-context.xml< / param-value> 
< / context-param> 
 < listener> 
< listener-class> org.springframework.web.context.ContextLoaderListener< / listener-class> 
< / listener> 
 < servlet> 
< servlet-name> appServlet< / servlet-name> 
< servlet-class> org.springframework.web.servlet.DispatcherServlet< / servlet-class> 
< init-param> 
< param-name> contextConfigLocation< / param-name> 
< param-value> /WEB-INF/spring/appServlet/servlet-context.xml< / param-value> 
< / init-param> 
  1< / load-on-startup> 
< / servlet> 
< servlet-mapping> 
< servlet-name> appServlet< / servlet-name> 
< url-pattern> /< / url-pattern> 
< / servlet-mapping> 
< / web-app> 
  
 
 
 
更新 - 堆栈跟踪
 
 
 
  exception  
  org.springframework.web.util.NestedServletException：请求处理失败;嵌套异常是org.hibernate.HibernateException：找不到当前线程的会话
 org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:973）
 org.springframework.web.servlet.FrameworkServlet .doPost（FrameworkServlet.java:863）
 javax.servlet.http.HttpServlet.service（HttpServlet.java:647）
 org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:837 ）
 javax.servlet.http.HttpServlet.service（HttpServlet.java:728）
  
 根本原因  
 
 
  org.hibernate.HibernateException：找不到当前线程的会话
 org .springframework.orm.hibernate4.SpringSessionContext.currentSession（SpringSessionContext.java:106）
 org.hibernate.internal.SessionFactoryImpl.getCurrentSession（SessionFactoryImpl.java:1014）
 com.spring.org.dao.GradeDaoImpl .addGrade（GradeDaoImpl.java:33）
 com.spring.org.service.GradeService Impl.addGrade（GradeServiceImpl.java:25）
 com.spring.org.GradeController.saveGrade（GradeController.java:32）
 sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）
太阳.reflect.NativeMethodAccessorImpl.invoke（来源不明）
 sun.reflect.DelegatingMethodAccessorImpl.invoke（来源不明）
 java.lang.reflect.Method.invoke（来源不明）
 org.springframework。 web.method.support.InvocableHandlerMethod.invoke（InvocableHandlerMethod.java:215）
 org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:132）
 org.springframework.web。 servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:104）
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod（RequestMappingHandlerAdapter.java:749）
 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAd apter.handleInternal（RequestMappingHandlerAdapter.java:689）
 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:83）
 org.springframework.web.servlet.DispatcherServlet。 doDispatch（DispatcherServlet.java:938）
 org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:870）
 org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java： 961）
 org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:863）
 javax.servlet.http.HttpServlet.service（HttpServlet.java:647）
组织。 springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:837）
 javax.servlet.http.HttpServlet.service（HttpServlet.java:728）
  
 
 
解决方案
您应该删除DAO实现上的@Transactional注释。取而代之的是你的Service方法;  
 
 
  @Override 
 @Transactional 
 public void addGrade（Grade grade）{ 
 gradeDao.addGrade（grade）; 
} 
  
只有服务实现需要所有数据库操作的@Transactional。  
I am using Spring MVC 4.0.6 and Hibernate 4.3.5 . I am trying to insert values to my database table but I am getting this error message:
HTTP Status 500 - Request processing failed; nested exception is org.hibernate.HibernateException: No Session found for current thread
Currently I am using sessionFactory.getCurrentSession() to save my data , but if I use getSessionFactory().openSession(); it works perfectly. I have heard I should use getCurrentSession instead of getSessionFactory().openSession(); because it creates a new session every time I make a database query.
Could you please see my code below and tell me what I am doing wrong and how to get sessionFactory.getCurrentSession() working ?
GradeServiceImpl:
@Service
@Transactional
public class GradeServiceImpl implements GradeService {

 @Autowired
 private GradeDao gradeDao;

 @Override
 public void addGrade(Grade grade) {

    gradeDao.addGrade(grade);
 }
}

GradeDaoImpl
@Repository
@Transactional
public class GradeDaoImpl implements GradeDao {

 @Autowired
 private SessionFactory sessionFactory;

 public SessionFactory getSessionFactory() {
    return sessionFactory;
 }

 public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;
 }
 @Override
 public void addGrade(Grade grade) {

    sessionFactory.getCurrentSession().save(grade);

 }
}  

servlet-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:beans="http://www.springframework.org/schema/beans" xmlns="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

   <annotation-driven />
   <context:annotation-config />
   <context:component-scan base-package="com.spring" />


   <resources mapping="/resources/**" location="/resources/" />
   <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
   <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <beans:property name="prefix" value="/WEB-INF/views/" />
      <beans:property name="suffix" value=".jsp" />
   </beans:bean>

   <beans:bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
      <beans:property name="driverClassName" value="com.mysql.jdbc.Driver" />
      <beans:property name="url" value="jdbc:mysql://localhost:3306/java" />
      <beans:property name="username" value="root" />
      <beans:property name="password" value="" />
   </beans:bean>

   <beans:bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
      <beans:property name="basename" value="resources/messages" />
      <beans:property name="defaultEncoding" value="UTF-8" />
   </beans:bean>

   <beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
      <beans:property name="dataSource" ref="dataSource" />
      <!-- <beans:property name="configLocation">
        <beans:value>classpath:hibernate.cfg.xml</beans:value>
        </beans:property>    -->
      <beans:property name="packagesToScan" value="com.spring" />
      <beans:property name="hibernateProperties">
         <beans:props>
            <beans:prop key="dialect">org.hibernate.dialect.MySQLDialect</beans:prop>
            <beans:prop key="show_sql">true</beans:prop>
            <beans:prop key="hibernate.hbm2ddl.auto">create</beans:prop>
            <beans:prop key="hibernate.show_sql">true</beans:prop>
         </beans:props>
      </beans:property>
   </beans:bean>

   <beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
      <beans:property name="sessionFactory" ref="sessionFactory" />
   </beans:bean>

</beans:beans>

Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
   <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring/root-context.xml</param-value>
   </context-param>
   <!-- Creates the Spring Container shared by all Servlets and Filters -->
   <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
   </listener>
   <!-- Processes application requests -->
   <servlet>
      <servlet-name>appServlet</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
      <servlet-name>appServlet</servlet-name>
      <url-pattern>/</url-pattern>
   </servlet-mapping>
</web-app>

Update - Stack trace
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.HibernateException: No Session found for current thread
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

root cause
org.hibernate.HibernateException: No Session found for current thread
    org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:106)
    org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:1014)
    com.spring.org.dao.GradeDaoImpl.addGrade(GradeDaoImpl.java:33)
    com.spring.org.service.GradeServiceImpl.addGrade(GradeServiceImpl.java:25)
    com.spring.org.GradeController.saveGrade(GradeController.java:32)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

 解决方案 
You should remove the @Transactional annotation on your DAO implementation. Instead in your Service method;
@Override
@Transactional
public void addGrade(Grade grade) {
    gradeDao.addGrade(grade);
}

Only service implementation required @Transactional for all database operations. 
                        
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10-11 01:59
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